ML17129A319

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TSD-11-004, Rev. 0 - Ludlum Model 44-10 Detector Sensitivity
ML17129A319
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Site: Zion  File:ZionSolutions icon.png
Issue date: 12/12/2011
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ZionSo/utions, Inc.

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ZIONSOLUTIONSu.c EH&S Technical Support Document TSD # 11-004 Ludlum Model 44-10 Detector Sensitivity Revision 0 Prepared By:

~~&fu'~6-=

Date:

12. 1l"Z-/ l(

Robert Dec

, LTP Engineer, ZionSolutions 1

~

/J;(Z/;(

Reviewed By:

Date:

Approved By:

Stev~ ~ilic~cePFe Date: I.:z-/, G'1f(

r/

~~. !

Reviewed By:

Date: 4~J1/~tl-R:CSeellediatiOtiollManager, I

I I ZionSolutions z/2frdZ-Approved By:

Date:

's Baker ice President, Environmental J

Health and Safety, ZionSolutions

Ludlum Model 44-10 Detector Sensitivity 1.0 Executive Summary EH&S TSD # 11-004 Revision 00 Page 2 of48 This Technical Support Document evaluates the sensitivity of the Ludlum Model 44-10 2.0" x 2.0" (5.08 x 5.08 cm) Nal detector when used to scan open land areas as a function of background, scan speed, and radionuclide mixture. Graphs of detector MDC as a function of background for various scan speeds are presented for Co-60, Cs-137, and a mixture of Co-60 and Cs-137.

2.0 Introduction The calculations exemplify the MARSSIM based determination for Minimum Detectable Concentration (MDC) for land areas. There are two principle objectives.

The first objective is to qualify the response of the vendors Nal detector to Cs-137 and Co-60 sources based on a study performed at a previous reactor decommissioning.

The second is to identify detectable residual soil concentrations for Co-60 and Cs-137 radionuclides at the Zion Station Restoration Project (ZSRP) site locations where the soil nuclide fractions are consistent with the data provided in this document. The evaluation includes consideration for using Co-60 or Cs-137 as surrogate radionuclides.

3.0 Table of Contents 1.0 Executive Summary...................................................................................................................... 2 2.0 Introduction................................................................................................................................... 2 3.0 Table of Contents.......................................................................................................................... 2 4.0 Background................................................................................................................................... 2 4.1 Limitations..................................................................................................................................... 3 4.2 Response Factor............................................................................................................................ 3 5.0 Model for Determination ofNaI Detector Soil MDC................................................................... 4 6.0 Soil Radionuclide Distribution...................................................................................................... 4 7.0 MicroShield' Code Runs and Derived MDC Values.................................................................. 4 7.1 Observations and Results.............................................................................................................. 5 7.2 Survey Techniques........................................................................................................................ 5 8.0 Attachments................................................................................................................................... 6 8.1 Co-60 and Cs-137 Response Factor Determination Instructions and Results............................... 6 8.2 MicroShield' Code Runs for Various Distances and Nuclide Fractions.................................... 6 8.3 Scan MDC (PCi/g) for Various Nuclide Fractions ofCo-60 and Cs-137..................................... 7 8.4 Scan MDC Fonnula and pCi/g Determination Example............................................................... 7 9.0 References..................................................................................................................................... 7 4.0

Background

Published sensitivity for the Ludlum 44-10 detector is listed in the manufacturer's literature as 900 cpm/fLRlhr for Cs-137. Table 6.70f NUREG-1575 lists the Co-60 and Cs-137 sensitivity for a 5.08 by 5.08 em Nal detector as 430 and 900 cpm/fLRlhr,

EH&S TSD # 11-004 Revision 00 Page 3 of 48 respectively. A study was performed (See Section 4.2) at the Rancho Seco Nuclear Generating Station (RSNGS) to confirm the manufacturer's literature. The values derived from the study will be used in this TSD as they were derived empirically.

4.1 Limitations The conclusions of this TSD are limited to (2" x 2") 5.08 by 5.08 cm Nal detectors.

4.2 Response Factor Determination of detector response factors at the RSNGS were conducted for both the Eberline Model SPA-3 and Ludlum Model 44-10 detectors. Only the information relative to the response of the Ludlum Model 44-10 will be addressed at this time.

Two NIST traceable sources were used, Co-SO and Cs-137. For both sealed sources the active area is very small when compared to the detector size and the distance from the source face to the detector centerline (located at 2.54 cm beyond the detector end cap).

}:al~~

CeJ'.lW'line PMT The evaluation process to determine detector response factors for Cs-137 and Co-SO are provided in Attachment 8.1. The results are presented in Table 1.0 below.

Table 1.0 NIR a

esponse F t

~

L dl M d 144 100 ac ors or u um o e -

etector Source to Detector Microshield'"

44-10 (5.08 x 5.08 cm)

Distance (cm)

Derived J.LRlh CPM/J.LRlh Co-60 Cs*137 C0-60 Cs-137 7.62 24.12 410.1 15.24 6.032 128.1 387.3 868.4 30.48 1.508 32.01 502.5 933.1 60.96 8.001 1021.7 Average 433.3 941.1 The average Cs-137 response factor for the 44-10 Nal detector is 941.0 cpm/l-lR/h.

The value is consistent with the results found in NUREG-1575 Table S.7. The average Co-SO value for the 44-10 Nal detector is 433 cpm/l-lRlh. This result is also consistent with the value reported in Table 6.7 of NUREG-1575. It is important to note that the principle gamma energy response for Cs-137 and Co-SO are in air and from a point source. The Nal detectors response will be greater for the lower energy gammas resulting from the scattering processes associated with the nuclides being distributed in soil media.

5.0 Model for Determination of Nal Detector Soil MOe EH&S TSD # 11-004 Revision 00 Page 4 of 48 The MARSSIM suggested scan speed of 0.5 m/s is used with the elevated (soil) area of interest being 0.196 m2 that relates to contaminants in a 50 cm diameter region that is 15 cm deep. The depth is consistent with the EPA and NRC definition of surface soils. The soil density is assumed at 1.6 g/cm3 and the composition used for the MicroShield' custom material soil model is composed of silicon oxide (sand). Recent acquisition of surface and subsurface soil sampling at the ZSRP indicate construction grade soils consisting primarily of loamy clay, sand and gravels that are of similar density values. The Nal detector height from the surface is varied and assumes surface to detector center distances of 3.0 (7.62 cm), 4.0 (10.16 cm) and 6.0 (15.24 cm) inches (2.0, 3.0, and 5.0 inches from the detector end cap). These distances provide reasonable estimates of the variation of detector height above the surface during scanning operations. The 50-centimeter diameter area is selected to provide a detector residence time of one second using a scan rate of 0.5 meters per second. It should be noted that soil scan surveys can result in detector residence times greater than one second. To this end, scan measurements are expected to result in conservative MOC values. The Model 44-10 Nal count rate conversion to exposure rate from Table 1.0 is used for each of the principle gamma emitting radionuclides. A surveyor efficiency of 0.5 and a d' (index of sensitivity) of 1.38 is included in the MOC determination. Inclusion of the surveyor efficiency and training of the surveyors to both listen for the instrument count rate and perform specific investigations following instrument alarms add conservatism to the MOC determination. Finally, the 50 cm diameter by 15 cm thick soil media assumes uniform distribution of the suspect radionuclides.

6.0 Soil Radionuclide Distribution The soil nuclide fraction for Co-60 is assumed to be 0.10 with Cs-137 comprising the remaining fraction. Values are also included for soils containing 100 percent Co-60 or Cs-137. As soil characterization progresses the MOC values provided in this TSO may be adjusted if significant nuclide fraction differences (+/-20%) are noted. Other soil nuclide compositions and subsequent action levels will be developed based or soil characterization results.

7.0 MicroShield' Code Runs and Derived MDC Values Specific MicroShield' code runs (See Attachment 8.2) were conducted to determine the exposure rate for the individual or combined nuclides. The code runs are based on the above dimensions, soil composition and density for a 1.0 pCi/g concentration.

These values are consistent with guidance provided in NUREG-1575 and 1757 Volume 2 Rev 1.

EH&S TSD # 11-004 Revision 00 Page 5 of4B The data in Attachment 8.2 presents the exposure rate results for various Cs-137 and Co-60 soil nuclide mixtures. The nuclide mix is used in the Microshield' code runs to derive exposure rate values based on the source to detector geometry. The spreadsheets in Attachments 8.3 utilized the MARSSIM guidance and formula, the detector response to the gamma emitting nuclides and, the conversion basis for detector cpm to soil pCi/g concentration. Graphical presentation of the results is included. Table 2.0 compares the derived MDC results for the varied nuclide fractions and assumes an ambient background of 6,000 cpm for the Ludlum Model 44-10 (for the formula see Attachment 8.4, Scan MDC Formula and pCi/g Determination Example). Detector response to Co-60 (1.0 nuclide fraction) results in a higher response (sensitivity) than for Cs-137 (1.0 nuclide fraction) and illustrates that if the Co-60 nuclide fraction increases the MDC will decrease.

Table 2.0 44-10 Detector Scan MDC (pCi/g)*

for Varied Cs-137 and Co-60 Nuclide Fractions can ;pee =.

S S

S d

05m1 Nuclide Nuclide Detector Distance" Fraction Fraction Inches (cm)

Cs-13795%

Cs-13790%

Co-60 5%

Co-60 10%

2.0 (5.0B) 4.35 4.1 3.0 (7.62) 5.2 4.8 6.0 (15.24) 7.2 6.7 Detector Background assumed at 6,000 cpm.

"Distance from detector end-cap to soil surface 7.1 Observations and Results Nuclide Fraction Cs-137100%

4.7 5.7 7.B Nuclide Fraction Co-60 100%

2.5 3.0 4.2 Table 2.0 above presents the evaluation results. The results show that as the Co-60 nuclide fraction increases the MDC decreases. At other reactor decommissioning sites Cs-137 was the dominant radionuclide. Both Maine Yankee and Rancho Seco reported an averaged soil Cs-137 content of ~ 90 percent. An initial nuclide fraction of 0.9 and 0.1 for Cs-137 and Co-60 will be used for site characterization and ISFSI surveys at ZSRP. Site characterization data will be continually assessed and used to update the sailor structure radionuclide mixture MDC and action levels.

7.2 Survey Techniques Detector background during land scanning operations is expected to range between 4.0oE+03 and 6.ooE+03 cpm. Tables 2.0 and 3.0 illustrate the MDCs (in pCi/g) for various distances and scan speeds. Identification of regions of potential contamination is based on the ability of the surveyor to distinguish an increase in count rate during the scanning operation. The surveyor is required to maintain the selected scan speed and detector distance from the suspect surface. Surveyor scanning sensitivity is discussed in chapter 6.0 of NUREG-1575 and NUREG-1507. Other survey techniques that may improve scan sensitivity include: use of the latching mode parameter of the data logging survey instrument (Ludlum 2350-1) to capture the maximum count rate

EH&S TSD # 11-004 Revision 00 Page 6 of 48 when scanning a suspect surface, changing the instrument (Ludlum 2350-1) time constant from variable to a fixed 1.0 second time constant to increase the instruments response rate and setting the instrument alarm level. Each of the above features augments the surveyor's efficiency for detecting areas of elevated activity.

Table 3.0 Ludlum 44-10 Detector MDC (pCi/g)*

(Cs-137 Nuclide Fraction 1.0) 8.0 Attachments Detector Distance** Scan Speed Inches (em) 0.5 mls 2.0 (5.08) 4.7 3.0 (7.62) 5.7 6.0 (15.24) 7.8 Detector background assumed at 6,000 cpm.

    • oistance from detector encl..c;ap to soil surface Scan Speed 0.25 mls 3.4 4.0 5.5 8.1 Co-60 and Cs-137 Response Factor Determination Instructions and Results Evaluation of SPA-3 and Ludlum 44-10 cpm per.uRlh Response Factors for Co-60 Microshield' runs for 7.62, 15.24 and 30.48 cm for Co-60 Source Certificate for Co-60 Serial Number 214-17-195 (SCN 335)

Evaluation of SPA-3 and Ludlum 44-10 cpm per.uRlh Response Factors for Cs-137 Microshield' runs for 15.24,30.48 and 60.96 cm for Cs-137 Source Certificate for Cs-137 Serial Number LY 376 (SCN 618)

Nal Response Factors for SPA-3 and 44-10 Detectors for Co-60 Nal Response Factors for SPA-3 and 44-10 Detectors for Cs-137 8.2 MicroShield' Code Runs for Various Distances and Nuclide Fractions Co-60 nuclide fraction equals 1.0. Distance equals 7.62, 10,16 and 15.24 centimeters from detector centerline.

Cs-137 nuclide fraction equals 1.0. Distance equals 7.62, 10.16 and 15.24 centimeters from detector centerline.

Co-60 nuclide fraction equals 0.05 and Cs-137 nuclide fraction equals 0.95.

Distance equals 7.62, 10.16 and 15.24 centimeters from detector centerline.

Co-60 nuclide fraction equals 0.10 and Cs-137 nuclide fraction equals 0.90.

Distance equals 7.62, 10,16 and 15.24 centimeters from detector centerline.

EH&S TSD # 11-004 Revision 00 Page 7 0148 8.3 Scan MDC (pCi/g) for Various Nuclide Fractions of Co-60 and Cs-137 Co-60 nuclide fraction equals 1.0. Distance is as noted in Section 8.2. Scan speed equals 0.5 m/s.

Cs-137 nuclide fraction equals 1.0. Distance is as noted in Section 8.2.

Scan speed equals 0.5 m/s.

Cs-137 nuclide fraction equals 1.0. Distance is as noted in Section 8.2.

Scan speed equals 0.25 m/s.

Co-60 nuclide fraction equals 0.05 and Cs-137 nuclide fraction equals 0.95.

Distance is as noted in Section 8.2. Scan speed equals 0.5 m/s.

Co-60 nuclide fraction equals 0.10 and Cs-137 nuclide fraction equals 0.90.

Distance is as noted in Section 8.2. Scan speed equals 0.5 m/s.

Co-60 nuclide fraction equals 0.10 and Cs-137 nuclide fraction equals 0.90.

Distance is as noted in Section 8.2. Scan speed equals 0.25 m/s.

8.4 Scan MDC Formula and pCi/g Determination Example 9.0 References 9.1 Decommissioning Technical Basis Document DTBD-05-012 V-O, 1117105 (Evaluation of Eberline SPA-3 and Ludlum 44-10 cpm per.uRlh Response Factors Robert F. Decker, August 19, 2004), Rancho Seco Nuclear Generating Station 9.2 NUREG-1575 "Multi-Agency Radiation Survey and Site Investigation Manual (MARSSIM)" Rev. 1 August 2000.

9.3 NUREG-1757 V2 Rev 1.0 "Consolidated Decommissioning Guidance:

Characterization, Surveys and Determination of Radiological Criteria" September 2006.

9.4 NUREG-1505 Rev 1, "A Nonparametric Statistical Methodology for the Design and Analysis of Final Status Decommissioning Surveys" June 1998

.1 Co-SO and Cs-137 Response Factor Determination Instructions and Results EH&S TSD # 11-004 Revision 00 Page 8 of 48 Evaluation of Eberline SPA-3 and Ludlum 44-10 cpm per,R/h Response Factors August 19, 2004 RFD The Nal detectors provided by Eberline and Ludlum include cpm per,RIh response factors for specific nuclides.

The instructions below are used to evaluate the response of both detectors to Co-60. The results of the evaluation are to confirm manufacturer results or modify the response factors accordingly.

Equipment:

Calibrated Eberline E-600 and Ludlum 2350-1 Eberline SPA-3 and Ludlum 44-10 detectors IPL Co-60 Source 214-17-195 8/1/1988 0.891,uCi Tape measure Materials to position the source and detector approximately 3 feet above the floor Materials to record the results of testing (utilize data logging features) and boxes provided in the table below.

Co-60 source: 0.891,uCi on 8-1-88. Decay corrected activity is 3.995 kBq (0.108,uCi) on 8-19-04.

Microshield' runs attached for point source at 7.62, 15.24 and 30.48 cm (3, 6 & 12 inches to centerline of detector active area)

Nal Response Factors for SPA-3 and 44-10 Detectors Distance Derived SPA-3 Estimate SPA-l Observed 44-10 Estimated 44-10 Observed (cm) pRlh 7.62 24.12 1.447E+04 cpm 9.3217E+03 cpm 1.0372E+04 cpm 9.8920E+03 cpm 15.24 6.032 3.619E+03 cpm 2.7440E+03 cpm 2.5938E+03 cpm 2.3361 E+03 cpm 30.48 1.508 9.048E+02 cpm 6.8530E+01 com 6.4844E+02 com 7.5780E+02 cpm Estimates based on vendor value of 600 and 430 com/uR/h for SPA-3 and 44-10, respectivelv.

Determination is conducted in an open area with the detector and source elevated 1.0 meter above the surface.

Walls and other solid obstructions should be at least 2 meters from the source and detector. The objective is to minimize scattering effects.

Each measurement is conducted in the scaler mode for the instrument and the measurement (count) time is 10 minutes.

Background is evaluated by performing a 1 O-minute count prior to the tests and with the source removed from the area.

Background cpm value: SPA 8525,44 8661 To determine the response to Co-60 the net counts per minute are divided by the.uR/h provided for the specific distance.

.1 Co-60 and Cs-137 Response Factor Determination Instructions and Results EH&S TSD # 11-004 Revision 00 Page 9 0148 MicroShleld v5.05 (5.0S"()0488)

Sacramento Municipal Uitility District Page

1 File Ref: ___

DOS File: Casel Date: ___

RUII De.* ~: August 24, 2004

'<un Time: 7:45:23 AM Duraibn : OO:CO:OO By:

Checked: ----

I i

Case

Title:

Co-60

==

Description:==

Nal Response Check @ 7.62 cm Geometry: 3 - Disk Source Dimensions Radius 0.238 em V.I in

_-------x Dose Points

~

r:

Ene:*ay MeV 0.6938 1.1732 1.3325 TOTALS:

  1. 1 7.62 em Oem 3.0 in 0.0 in Shield Name Air Gap Source Input Shields Material Air Grouping Method: Actual Photon Energies Nuclid.~

curies

!;>ecgu~rels

~j,'g!!f Bglcm'

?.

Oem 0.0 in Densi.\\y 0.00122 Co-60

  • . 0797e-007 3.9950e+003 6.0931e-OOI 2.2544e+004 Buildup The material reference is : Air Gap Integration Parameters Radial Circumferential Results Activity Fluence Bl!t~

Fluence Rate

~hotons/sec MeV/cm'/sec MeVlcm'/sec No Buildu~

With Buildu~

6.517e-Ol 6.18ge-04 6.193e-04 3.995e+03 6.417e+00 6.41ge+00 3.995e+03 7.288e+00 7.291e+00 7.991e+03 1.371e+Ol 1.371e+Ol 20 20 Ex~osure Rate mRlhr No Buildu~

1.195e-06 1.147e-02 1.264e-02 2.411e-02 Ex~osure Rate mR/hr With Buiidl!Q 1.196e-06 1.147e-02 1.265e-02 2.412e-02

.1 Co-60 and Cs-137 Response Factor Determination Instructions and Results MicroShield v5.05 (5.05.00488)

Sacramento Municipal Uitility District EH&S TSD # 11-004 Revision 00 Page 10 of 48 Page 1

File Ref:.. __

  • _.. _

DOS File: Casel Oate: __

By:

Run Date : lIugust 24. 2004 Run Time' 7:47:04 AM Dur!'.t;on : 00:00:00 Checked: ___

Case

Title:

Co-60

==

Description:==

Nal Response Check @ 15.24 cm Geometry: 3

  • Disk Source Dimensions Radius 0.238 em 0.1 in

~--.. -----.. --.-.-.. -

Dose Points

~

y.

l Energy Mr~1I.

0.6938 1.1732 1.3325 TOTALS:

  1. 1 15.24 em 0 em 6.0 in 0.0 in Shield Name Air Gap Source Input Shields Materjal Air Grouping Method: Actual Photon Energies

!:!.uelide curieJ>

beeguarel.

oCi/em' Bg/cm' co-se 1.0797e-007 3.9950a+003 6.0931e-00l 2.2544e+004 Buildup The material reference is : Air Gap Integration Parameters Radial Circumterentia~

Results 20 20 Oem 0.0 in Densitv 0.00122 Activity Fluence Rate Fluen~ Rate EXQosure Rate EXQQsure Rate ghotons/sec MeV/em'/see MeV/em'/see mRlhr mRlhr No Bujlgug With Buildup No Buildup With Buildup 6.517e-Ol 1.547e-04 1.54ge-04 2.986e-07 2.990e-07 3.995e+03 1.604e+00 1.605e+00 2.866e-03 2.86ge-03 3.995e+03 1.822e+00 1.823e+00 3.161e-03 3.163e-03 7.991e+03 3.426e+00 3.42ge+00 6.027e-03 6.032e-03

.1 Co-60 and Cs-137 Response Factor Determination Instructions and Results MicroShield v5.05 (5.05.00488)

Sacramento Municipal Ultllity District EH&S TSD # 11-004 Revision 00 Page 11 of 48 Pag3

1 File Ref:. _ _

DOS File: Case1 Run Date: August 24, 2004 Rcn Tim!'!: 7:48:15 AM Duration : 00:00:00 Case

Title:

Co-SO

==

Description:==

Nal Response Check @ 30.48 cm Geometry: 3 - Disk Date: ___ _

By:

Checked: ----

Source Dimensions Radius 0.238 em 0.1 in

___ x

'f l,....-._--

Dose Points Energy MeV 0.6938 1.1732 1.3325 TOTALS:

~

't

  1. 1 30.48 em 0 ern Shield Name Air Gap Source Input 1 ft 0.0 in Shields Material Air Grouping Method: Actual Photon Energies Nuclide curies pec.querels uCVem' Bg/em' Co-60 1.0797e-007 3.9950e+003 6.0931e-001 2.2544e+004 Buildup The material reference Is : Air Gap Integration Parameters Radial Circumferential Results 20 20 l

Oem 0.0 in Density 0.00122 Activity FI~ence Rate Fluence Rate EXIlosure Rate EXQQsure Rate Ilhotons/see MeV/cm'/see MeV/em'/see mR/hr mR/hr No BuilguIl With BuilduIl No Build~12 With BuilduIl 6.517e-01 3.862e-05 3.871e-05 7.456e-08 7.474e-08 3.995e+03 4.006e-01 4.012e-01 7.158e-04

7. 170e-04 3.995e+03 4.550e-01 4.557e-01 7.895e-04 7.906e-04 7.991e+03 8.557e-Ol 8.570e-01 1.505e.o3 1.508e-03

.1 Co-SO and Cs-137 Response Factor Determination Instructions and Results EH&S TSD # 11-004 Revision 00 Page 12 of 48

\\_. 8/,1/83 ~

CER11F1CATE OF GAMMA STANDARD SOURCE Radlonucllde:

Go -cO Half*llfe:

S. 2714.;. Q. avO =:;..-

-,n. ".,

  • ron

.***" -r.- ~H

P.30,,.'009 C;Jstomer
r.'8...c..Qy.(,;:,*~e..tcl!;??t.!rIot:".I.*.

P.O. No.:

,~_. __

...... +/-_...... c 0................. _

Catalog No.: G:-::£,]

Source No.:214-17-~95Reference Date: At'U. 1. ~.98e Contained Radioactivity: ____ ).89 1

, uCi O.scrlptlon of Source

a. Capsule type:

.J

=.

b. Nature of active dep.0sit;

,,'iAPORATED MEr~LL!C SALTS ___ _

c. Active d~~a~m~e~~ir:~_=~C~.~}~E~7="===============
d. Backing:

N A

e. Cover:

N A R,dlolmpuritle.

NO!iE DETE8T!:D Method of Calibration X ) The source was assayed by gamma spectrometry, Integrating under the 1.173 & 1.112 Mev peak(s). The branching rallo(s) used was/were 1..0 &:: 1.0 gamma rays per decay.

) The source was preparad from a weight aliquot of solution whose activity in uCI/gram wasdetermlned by the melhod above.

Uncertainty of Measurement

a. Sy-stematic uncertainty in instrument calibration: +/-

!..1

b. Random uncertainly
1. In assay: +/- _
..1 I
2. In welghlng(s): +/- *..
c. Total Uncertainty: +/-

2, 4

% at the 990(0 confidence level.

NBS Tr.ceabillty This calibration is implicitly traceable to the National Bureau of Standards.

Not **

1. Nucl~ar data were taken from **Table of Isotopes", Seventh Edition, edited by C. Michael Lederer et al.
2. IPL participates in an NBS measurement assurance program to establish and maintain implicit traceability for a number of nuclides, based on the blind assay (and iater NBS certification) of Standard Reference Materials. (As In NRC Regulatory Guide 4.15)

Quality Control ISOTOPE PROOUCTS LABORATORIES 1800 No. Keystone St., Burbank, California 91504 (818) 843*7000 i

I i

i==~=-=_=================================~

.1 Co-SO and Cs-137 Response Factor Determination Instructions and Results EH&S TSD # 11-004 Revision 00 Page 13 of 48 Evaluation of Eberline SPA-3 and Ludlum 44-10 cpm per)lR/h Response Factors August 19, 2004 RFD The Nal detector s provided by Eberline and Ludlum include cpm per ~j response factors for specific nuclides. The instructions below are used to evaluate the response of both detectors to Cs-13 7.

The results of the evaluation are to confirm manufacturer results or modify the response factors accordingly.

Equipment:

Calibrated Eberline E-600 and Ludlum 2350-1 Eberline SPA-3 and Ludlum 44-10 detectors AEA Cs-137 Source 68970 - L Y 376 Tape Measure Material to position the source and detector approximately 3 feet above the floor Material to record the results of testing (utilize data logging features) and boxes provided in table below.

Cs-137 Source: 344 kBq (9.297 /-LCi) on 10/1/03. Decay corrected is 337.1 kBq (9.111/-LCi) on 8/18/04 MicroShield' runs attached fro point source at 15.24,30.48 and 60.96 cm (6,12 & 24 inches to centerline of detector active area.

NaIR esponse ac on or

- an e ec ors F t

£ SPA 3 d 44 10 D t t Distance (em)

Derived IIRIb SP A-3 Estimate SPA-3 Observed 44-10 Estimate 44-10 Observed 15.24 128.1 1.537E+05 1.3642E+05 1.153E+05 1.228E+05 30.48 32.01 3.84IE+04 4.36IE+04 2.88IE+04 4.143E+04 60.96 8.001 9.60IE+03 9.60IE+03 7.20IE+03 1.974E+04 Estimates based on 1200 and 900 cpm for SPA-3 and 44-10, respectively Determination is conducted in an open area with the detector and source elevated 1.0 meter above the surface. Walls and other obstructions should be at least 2 meters form the source and detector. The objective is to minimize scattering effects.

Each measurement is conducted in the scalar mode for the instrument and the measurement (count) time is 10.0 minutes.

Background is evaluated by performing a 10 minute count prior to the tests and with the source removed from the area.

Background cpm value: SPA-3 = 8525, 44-10 = 8661 To determine the response to Cs-137 the net counts per minute are divided by the /-LRih provided for the specific distance.

.1 Co-60 and Cs-137 Response Factor Determination Instructions and Results EH&S TSD # 11-004 Revision 00 Page 14 of 48

'age

1

)OS File: Case1

~un Date : August 17, 2004

~un Time: 11 :31:58 AM

)umtior, : C~:OO:OO MicroShield v5.05 (5.05*00488)

Sacramento Municipal Uitllity District Case

Title:

9.11 uCI Cs*137

==

Description:==

Point Source at 15.24 cm Geometry: 1 - Point

___ - x File Ref: ___ _

Oate: _ __ _

By:

Checked: ----

Dose Points

  1. 1 2S y

15.24 em 0 cm l

Ocm 0.0 in "nsrgy t,ctivity MeV

~hotons/sec 0.0318 6.602e+03 0.0322 1.218e+04 0.0364 4.433e+03 0.6616 2.86ge+05 TOTALS:

3.102e+05 6.0 in 0.0 in Shield Name Air Gap Source Input Shields Material Air Grouping Method: Actual Photon Energies Nuclide curies bccguerels Ba-137m 8.6188e-006

3. 1890e+005 Cs-137 9.1108e-006 3.3710e+005 Buildup The material reference is : Air Gap Results Fluence Rate Fluence Rate EXQosure Rate MeV/cm'/sec MeV/cm'lsec mRlhr NQ BuilduQ With BuilduQ No BuilduQ 7.157e-02 7.206e-02 5.962e-04 1.336e-01 1.345e-01 1.075e-03 5.502e-02 5.540e-02 3.126e-04 6.496e+01 6.504e+01 1.25ge-01 6.522e+01 6.530e+01 1.27ge-01 Density 0.00122 Exposure Rate mRihl With BuilduQ 6.003e-04 1.083a-03 3.147e-04 1.261 e-01 1.281 e-01

.1 Co-60 and Cs-137 Response Factor Determination Instructions and Results EH&S TSD # 11-004 Revision 00 Page 15 of 48

'age

1 lOS File : Case1

<un Date: August 17. 2004

,un Time: 11 :29:10 AM Juration : 00:00:00 MicroShield v5.05 (5.05-00488)

Sacramento Municipal Uitility District Case

Title:

9.11 uCi Cs-137

==

Description:==

Point Source at 30.48 cm Geometry: 1

  • Point File Ref:

Date: =_-=--_-_-__ -_-.==_

By:. ___

Checked:

Dose Points

~

y.

?:

  1. 1 30.48 cm 0 cm Oem 0.0 in Energy Activity MeV Rhotons/sec 0.0318 6.602e+03 0.0322 1.218e+04 0.0364 4.433e+03 0.6616 2.86ge+05 TOTALS:

3.102e+05 1ft G.Oin Shield Name Air Gap Source Input Shields Material Air Grouping Method: Actual Photon Energies Nuclide curies becquerels Ba-137m 8.6~88e*006 3.1890e+005 Cs-137 9.11086-006 3.3710e+005 Buildup The material reference is : Air Gap Results Fluence Rate Fluence Rate fOxQosure Rate MeV/cm'/sec MeVicm'/sec mR/hr No BuilduQ

\\'\\11th BuilduQ No BuilduQ 1.77ge-02 1.804e-02 1.482e-04 3.323e-02 3.368e-02 2.674e-04 1.36ge-02 1.388e-02 7.77ge-05 1.622e+01 1.626e+01 3.144e-02 1.628e+01 1.632e+01 3.193e-02 Density 0.00122 Exposure Rate mRlhr With Buildup 1.503e-04 2.711e-04 7.885e-05 3.151e-02 3.201e-02

.1 Co-60 and Cs-137 Response Factor Determination Instructions and Results

'age

1

)05 File: Casel

~un Data : August 17. 2004

~un Time: 11 :30:55 AM

)",ation : 00:00:00 MicroShield v5.05 (5.05.00488)

Sacramento Municipal Uitility District Case

Title:

9.11 uCi Cs*137

==

Description:==

Point Source at 60.96 cm Geometry: I* Point EH&S TSD # 11-004 Revision 00 Page 16 of 48 File Ref: ___ _

oate: ___ _

By:

Checked: ----

__ ---h Dose Points

~

Eneruy MeV 0.0318 0.0322 0.0364 0.6616 TOTALS:

y

~

  1. 1 X

60.96 em 2ft Oem 0.0 in Oem 0.0 in Activity Qhotons/sec 6.602e+03 1.218e+04 4.433e+03 2.86ge+05 3.102e+05 Shield Name Air Gap Source Input Shields Malerial Air Grouping Method: Actual Photon Energies Nuclide curies beeguerels Ba-137m 8.6188e-006 3.1890e+005 Cs-137 9.11080-006 3.3710e+005 I

Buildup The material reference is : Air Gap Results Fluence Rate Fluence Rate S1gl~Q!llJ!!lB3te MeV/cm'/sec MeV/cm'/sec mRlhr No BuilduQ With BuilduQ No BuilduQ 4.39ge-03 4.521e-03 3.665e-05 8.216e-03 8.444e-03 6.612e-05 3.391e-03 3.484e-03 1.926e-05 4.042e+00 4.062e+00 7.837e-03 4.058e+00 4.07ge+00 7.95ge-03 Density 0.00122

];)gl.9~J3~1\\l mRlhr With BuilduQ 3.766e-05 6.795e-05 1.980e-05 7.875e-03 8.001e-03

.1 Co-SO and Cs-137 Response Factor Determination Instructions and Results CERTIFiCATE No. 68970 - L Y 376 for a Sealed Radioactive Source Source Type: Reference Sourc.

Product code CDRX1476 Drawing VZ-47712 Source no.

LY37S Nuclide Caeslr.:m*137 Measurement Data Activity Uncertainty*

344 kBq 3%

1 Oclober 2003 Defined on page 2 EH&S TSD # 11-004 Revision 00 Page 17of4B c~:f+ 'It 0'3-0... 7 461.1sJuc., 03-01-03 AEA Technology QSAGmbH Gia:i". I

]8110 BraW\\Sdlwcia PoItracld137 J800IBraUIIJchwdi c_

Ttl +.. ~ (0) Sl07 932-1)

Fn.... ~(OjS307932*I94 17~ 2003 Reference dr.e TraceabiliV Radioactive impunlies Relate~ to Cs-137 (eqLsl 100 %) the following radioactive impurities were detected: Cs-134 < 0.1 %

Leakage and Contamination Testis Test method/s*

Testis pass<< on Additionallnfonnation 150_*

Band I 16 September 2003 C.34313 AEA Technology QSA GmbH

.1 Co-60 and Cs-137 Response Factor Determination Instructions and Results EH&S TSD # 11-004 Revision 00 Page 18 of 48

"?,.... c.... rt.,.t. 03 - 0 ~ 7 Explanations for Certificates (Page 2 of CertifiCates)

Uncertainty

'The reported uncertainty iI based on standard' uncertaiJiy multiplied by. ~o

~c:Ior k

  • 2, providing a level of confidence of appruximattty 95 %. {JSOGuide, 1995) leakage and contamln.tion tests AEA TetimOlogy QSA GmbH has been aocrediled as DKD (o.LMdIer Kalibrl8ldier-o Ciallibration laboral:oiy by Ille Physblisch.-Technisc:tle Bu~

daanalt (PTB) and Mltllorized to issue reference aourc:es whIch are traceable 1D ndonal.anliards held.: the PTa In Gamany.

811~ of the European cg..

~ mutual

~

oIio_"""""

lMI1'Iburs Ie, g. NAMAS, UK).

ThIs ptIX!ua com;1les v.ilt: ttllI reQUimnanls for tmce=~

NlST specified In tha Ndcml Slamwd "Traceabllity of Rlldioactiv1t Sources to the NIST and Associated Instru-IMnI: auaity Co_nlml (ANSI N42.22*1995)-,

As

  • requlremem for the ANSI N42.22*1995 AEA Technology QSA parUdpellls In the NEIINIST Measuranonb Assurn::e f'ro.g:ram fA the Nuclei. Powet htuWy
  • Strin!l8nt tests fur I". are an essanliar featU1'8 of radiolctlve 'OUreM production. They 1m! based on ISO 11'"8. Som., Wlndan::!

methods used for testing radiation sources are rliled below.

Wipe lest I

!:b :utir:.:. :t!:'

~

_anol or water. the actMly remavec:lls meuured.

linIit:200Sq (LImIt USA: 5 nCI) lSO classifICation Immersion test II The aource is lmmlrucl In I au/table liquid at 50 *C for at lust " hcln and the actiYIy rernoo;ed Is meamed.

UrnIt UIS Bq Bubble test III The source 1& immersed in

.... r Of

  • suitable liquid lind thl ptNIure In the "..e' f'IIduc:.d to 13 kPa (100 mm Hell. No butIbIes mull til ob........

The II'ItemationaI ~

for Standardizlllkln (ISOt IIaI Pf090Md

  • I)'StlIm of ctnsJlic:ltIon !If IeIIIId radiD8CIive sources based on aafely requirements lor typrk:aI us. (lIN ISO 2919). This l,slam ptOIIidH I manufacturer Of sailed ractiDldiI.e IOUrces will I Nt of tests to evaluate the NhAY of his prodLJds. It also assists I us. of aueh lealed IOUrceS to IBlect twes which IU!t.1he appncation he hal in mind. The testa to WhICfi.pecilnllIlOutCll 11'9 su~d anr.1iI~ In the foUlM'ing table.

Classification of saaled.ouree performance standard according to ISO 291&

s g peak ImpH*

Special appliCations NI) tut progratDme can QIMtf all possille combinalion5 of errWonmenb to IIIfIII:II 5O.U'Ce may be expo&ad..

u.ens &hcufd thel9fo:e conluK our experts.

before using 10wceS ir. potentially adVIirsa envltonments.

F.El.lssue 3.2003-03-27 IAEA SpeeiaJ Form

'Spedat Form' 1& a last ~

cation for sealed IIOurCU,;,.n In 1M tAEA transport regu~

tkms (IAEA Safety Seli.. No.

6, '985, revised eel/tion).

II II wed in dDtermin~ thl maximum accePiabilt IctiYltiH for various types of transport c:c:mainers.

Quality aasurance System The quaIiIy assutanee system tf A£A Technology Qs.-.

GmbH Will certified ~ Uoyd'I ReglJter Quality ASsurance tl..RQA) according to ISO

~OO', Issue 1994.

Isotnlk

~roducts mel!! the requiM-m.nts of 10CFR50 Appen-dlxB.

~

4~

JI.I6Q TECHNOLO~

,.IQ<;t; I _ ;'

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.1 Co-60 and Cs-137 Response Factor Determination Instructions and Results Co-60 Nal Response Factors for SPA-3 and 44-10 Detectors Gross Data count Net Counts CPMh,R/h EH&S TSD # 11-004 Revision 00 Page 19 of 48 in~~nt-- _. '~~~~=r~~=-~'-= ';'~~=~~;:5 Cf!l ~:.:~r-=-\\9;1~~L~'=~'t.-..,

Average _--=1

. --44=10 -

- -,.. - *- -4~tO*-~~-' _... __ ___ ~~.7 __ _ :::--~!iO~'l : -_~ _ --,-=-:,,:- ~; -* *-- l

.1 Co-60 and Cs-137 Response Factor Determination Instructions and Results EH&S TSD # 11-004 Revision 00 Page 20 of48 Cs-137 Nal Response Factors for SPA-3 and 44-10 Detectors Gross Data

_. Instrumei'lI---Y-'SoriaINumbe;-r-Backjlround 15.24crn~ :

30~4acm I

GO&Gcm SPA-3---r--'

_405Cr~ - _ : ___ J..!..4.!?~L.... ~r. __ ~82101 ____ ~3§§75 :T~**1974~~.. -=':

4-.;.-10 211672_--L... __ 11562L ___ L 613988 __.L, __._.i142~!L __ ~_

19736.§

~.~ *m/l\\\\lt~ C\\'lUnl r~ll I,.., th.' ti" ( I :S.=:-; Cllii nlCa~'Urcrr*ml dUo: tco hi,!.:!) CI'Un( n;h:

InSli umCIII m~ *.o.:11 OUl \\" I ~,.1lJ)ra::: inJ;lId~ 1...5 minUII:$ 1.1 gil in::l III minute "/J'In;.

Net Ccunts CPMlf,Rlh f-

!.flSs.Lpr"-An-3~n.L ___." _. __ I:62.9.11_.. ' _'.. ~ ?~~.-~-.. -l. 30.48 em I

Average._-. -~

975 1003 I __ l..Q~:! _____ J ___. 1004 "

._1 10 -. -" :~.::::_~§!!....::-:~ ~:::~-- 933 -- -,-

1022

_" _ _._941 _ __. J

.2 MicroShield' Code Runs MicroShield 8.03 EnergySolutions (8.03-0000)

Date 12/2/2011 By R. F. Decker Filename Case1 Case Title Description Geometry Height Radius A

X

  1. 1 0.0 em (0 in)

ShieldN Run Date December 2, 2011 Project Info Run Time 12:14:20 PM Co-60 100%

Source Dimensions Co-60 100% 2.54, 7.62 and 12.7 em 8 - Cylinder Volume - End Shields 15.24 em (6.0 in) 25.0 em (9.8 in)

Dose Points y

20.32 em (8.0 in)

Shields Dimension z

0.0 em (0 in)

Source Air Gap 2.9ge+04 em' Material Sand Air Density 1.6 0.00122 Nuclide Co-60 Source Input: Grouping Method - Actual Photon Energies Ci Bq

/lCi/cm' 4.7878e-008 1.7715e+003 1.6000e-006 Buildup: The material reference is Source Integration Parameters Radial Circumferential Y Direction (axial)

Results EH&S TSD # 11-004 Revision 00 Page 21 of 48 Checked Duration 00:00:00 Bq/cm' 5.9200e-002 20 10 10 Fluence Rate Fluence Rate Exposure Rate Exposure Rate Energy (MeV) Activity (Photons/sec) MeV/cm'/sec MeV/cm'/sec mRlhr mRlhr No BuilliUP. With Buildup No Buildup With Buildup

.2 EH&S TSD # 11-004 MicroShield' Code Runs Revision 00 Page 22 of48 0.6938 2.890e-Ol 1.824e-05 3.278e-05 3.521e-08 6.32ge-08 1.1732 1.771e+03 2.224e-Ol 3,441e-Ol 3.974e-04 6.150e-04 1.3325 1.771e+03 2.623e-Ol 3.92ge-Ol 4.550e-04 6.816e-04 Totals 3.S43e+03 4.847e-Ol 7.370e-Ol 8.S2Se-04 1.297e-03 Sensitivity Variable Y Dose Point 1 (lofS)

(20.32 em) 0.6938 2.890e-Ol

1. 824e-05 3.278e-05 3.521e-08 6.32ge-08 1.1732 1.771e+03 2.224e-Ol 3,441e-Ol 3.974e-04
6. 1 50e-04 1.3325 1.771e+03 2.623e-01 3.92ge-Ol 4.550e-04 6.816e-04 Totals 3.S43e+03 4.847e-Ol 7.370e-Ol 8.S2Se-04 1.297e-03 Sensitivity Variable Y Dose Point 1 (2ofS)

(22.86 em) 0.6938 2.890e-Ol 1.547e-05 2.720e-05 2.986e-08 5.251e-08 1.1732 1.771e+03 1.873e-01 2.846e-Ol 3.347e-04 5.086e-04 1.3325 1.771e+03 2.205e-Ol 3.247e-Ol 3.826e-04 5.633e-04 Totals 3.S43e+03 4.07ge-Ol 6.093e-Ol 7.174e-04 1.072e-03 Sensitivity Variable Y Dose Point 1 (30fS)

(2S.4 em) 0.6938 2.890e-Ol 1.318e-05 2.282e-05 2.544e-08 4,407e-08 1.1732 1.771e+03 1.588e-Ol 2.383e-Ol 2.838e-04 4.25ge-04 1.3325 1.771e+03 1.868e-Ol 2.718e-Ol 3.241e-04 4.715e-04 Totals 3.S43e+03 3.4S6e-Ol S.10Ie-0l 6.07ge-04 8.97Se-04 Sensitivity Variable Y Dose Point 1 (4ofS)

(27.94 em) 0.6938 2.890e-01 1.128e-05 1.934e-05 2.17ge-08 3.734e-08 1.1732 1.771e+03 1.356e-Ol 2.017e-Ol 2,422e-04 3.604e-04 1.3325 1.771e+03 1.593e-Ol 2.29ge-Ol 2.764e-04 3.988e-04 Totals 3.S43e+03 2.94ge-Ol 4.316e-Ol S.186e-04 7.S93e-04 Sensitivity Variable Y Dose Point 1 (S ofS)

(30.48 em) 0.6938 2.890e-Ol 9.718e-06 1.653e-05 1.876e-08 3.192e-08 1.1732 1.77 1 e+03 1.165e-Ol 1.723e-Ol 2.081e-04 3.07ge-04 1.3325 1.771e+03 1.368e-Ol 1.963e-Ol 2.373e-04 3,406e-04 Totals 3.S43e+03 2.S33e-Ol 3.686e-Ol 4.4SSe-04 6.48Se-04 Sensitivity Analysis Summary - Y Dose Point 1 D

P' t # S

'ti 'ty Sensitivity Fluenee Rate Fluenee Rate Exposure Rate Exposure Rate ose om ensl VI DimenSIOn MeV/em'/see MeV/em'/see mRlbr mRlbr

.2 EH&S TSD # 11-004 MicroShield' Code Runs Revision 00 Page 23 of48 No Buildup With Buildup No Buildup With Buildup 1

(1 of5)

(20.32 em) 4.847e-Ol 7.370e-Ol 8.525e-04 1.297e-03 1

(2of5)

(22.86 em) 4.07ge-Ol 6.093e-Ol 7.1 74e-04 1.072e-03 1

(30f5)

(25.4 em) 3.456e-Ol 5.l01e-Ol 6.07ge-04 8.975e-04 1

(4of5)

(27.94 em) 2.94ge-Ol 4.316e-Ol 5.1 86e-04 7.593e-04 1

(5 of 5)

(30.48 em) 2.533e-Ol 3.686e-Ol 4.455e-04 6.485e-04

Date 12/212011 Filename Case1 Case Title Description Geometry Height Radius A

X

  1. 1 0.0 em (0 in).2 MicroShield' Code Runs MicroShield 8.03 EnergySolutions (8.03-0000)

By Robert F. Decker Run Date December 2, 2011 Run Time 12:29:22 PM Project Info Cs-137 100%

Cs-137 100% 2.54 - 12.7 em S - Cylinder Volume - End Shields Source Dimensions 15.24 em (6.0 in) 25.0 cm (9.S in)

Dose Points y

20.32 em (S.O in)

Shields z

0.0 em (0 in)

Shield N Dimension Material Sand Air Density 1.6 0.00122 Source Air Gap Nuclide Ba-137m Cs-137 2.99e+04 cm3 Source Input: Grouping Method - Actual Photon Energies Ci Bq

)lCi/cm' 4.5292e-00S 4.7S7Se-00S 1.675Se+003 1.7715e+003 1.5136e-006 1.6000e-006 Buildup: The material reference is Source Integration Parameters Radial Circumferential Y Direction (axial)

Results EH&S TSD # 11-004 Revision 00 Page 24 of48 Checked Duration 00:00:00 Bq/cm3 5.6003e-002 5.9200e-002 20 10 10

.2 EH&S TSD # 11-004 MicroShield' Code Runs Revision 00 Page 25 of48 Fluence Rate Fluence Rate Exposure Rate Exposure Rate Energy (MeV) Activity (photons/sec) MeV/cml/sec MeV/cml/sec mRlhr mRlhr No Buildup With Buildup No Buildup With Buildup 0.0045 l.740e+Ol 7.481e-08 7.70ge-08 5.l27e-08 5.284e-08 0.0318 3.46ge+Ol 9.338e-06 1.152e-05 7.778e-08 9.59ge-08 0.0322 6.401e+Ol l.797e-05 2.232e-05 1.446e-07 l.797e-07 0.0364 2.329e+Ol l.002e-05 l.33ge-05 5.691e-08 7.606e-08 0.6616 1.508e+03 8.942e-02 l.631e-Ol l.734e-04 3.162e-04 Totals 1.647e+03 8.946e-02 1.632e-01 1.737e-04 3.166e-04 Sensitivity Variable Y Dose Point 1 (1 of 5)

(20.32 cm) 0.0045 l.740e+01 7.48Ie-08 7.70ge-08 5.l27e-08 5.284e-08 0.0318 3.46ge+Ol 9.338e-06 1.152e-05 7.778e-08 9.59ge-08 0.0322 6.401e+Ol l.797e-05 2.232e-05 1.446e-07 l.797e-07 0.0364 2.329e+Ol l.002e-05 l.33ge-05 5.691e-08 7.606e-08 0.6616 1.508e+03 8.942e-02 l.631e-Ol 1.734e-04 3.162e-04 Totals 1.647e+03 8.946e-02 1.632e-01 1.737e-04 3.166e-04 Sensitivity Variable Y Dose Point 1 (2 of 5)

(22.86 cm) 0.0045 1.740e+Ol 6.603e-08 6.801e-08 4.526e-08 4.662e-08 0.0318 3.46ge+Ol 8.221e-06 1.014e-05 6.848e-OS S.44Se-08 0.0322 6.401e+Ol 1.582e-05 1.964e-05 1.273e-07 l.581e-07 0.0364 2.329e+Ol 8.S00e-06 1.175e-05 5.000e-08 6.675e-08 0.6616 1.50Se+03 7.588e-02 l.354e-Ol 1.471e-04 2.625e-04 Totals 1.647e+03 7.592e-02 1.354e-01 1.474e-04 2.628e-04 Sensitivity Variable Y Dose Point 1 (3 of 5)

(25.4 cm) 0.0045 1.740e+Ol 5.793e-08 5.966e-08 3.971e-08 4.0Sge-08 0.031S 3.469e+Ol 7.200e-06 S.SSOe-06 5.997e-OS 7.397e-08 0.0322 6.401e+Ol l.385e-05 1.71ge-05 1.115e-07 l.3S4e-07 0.0364 2.329e+Ol 7.697e-06 1.027e-05 4.373e-OS 5.S35e-08 0.6616 1.508e+03 6.468e-02 1.136e-Ol 1.254e-04 2.203e-04 Totals 1.647e+03 6.470e-02 1.137e-01 1.256e-04 2.206e-04 Sensitivity Variable Y Dose Point 1 (4 of 5)

(27.94 cm) 0.0045 l.740e+Ol 5.066e-08 5.216e-08 3.472e-OS 3.575e-08

.2 EH&S TSD # 11-004 MicroShield' Code Runs Revision 00 Page 26 of4B 0.0318 3.46ge+01 6.290e-06 7.7S7e-06 S.240e-08 6.46Ie-08 0.0322 6.40Ie+01 1.210e-OS l.S0Ie-OS 9.738e-08 1.208e-07 0.0364 2.32ge+01 6.71ge-06 8.961e-06 3.818e-08 S.092e-08 0.6616 I.S08e+03 S.S40e-02 9.62ge-02 1.074e-04 1.867e-04 Totals 1.647e+03 5.542e-02 9.632e-02 1.076e-04 1.86ge-04 Sensitivity Variable Y Dose Point 1 (5 of 5)

(30.48 em) 0.004S 1.740e+Ol 4.423e-08 4.SS4e-08 3.032e-08 3.122e-08 0.0318 3.46ge+Ol S.493e-06 6.773e-06 4.576e-08 S.642e-08 0.0322 6.401e+Ol 1.0S7e-OS 1.311e-OS 8.504e-08 1.0SSe-07 0.0364 2.32ge+Ol S.86Se-06 7.81ge-06 3.332e-08 4.442e-08 0.6616 1.508e+03 4.771e-02 8.233e-02 9.2S0e-OS I.S96e-04 Totals 1.647e+03 4.774e-02 8.236e-02 9.26ge-05 1.598e-04 Sensitivity Analysis Summary - Y Dose Point 1 S

  • ti*ty Fluenee Rate Fluenee Rate Exposure Rate Exposure Rate Dose Point # Sensitivity D~nsl v.1 MeV/em'/see MeV/em'/see mRlhr mRlhr unenslOn No Buildup With Buildup No Buildup With Buildup 1

(1ofS)

(20.32 em) 8.946e-02 1.632e-Ol 1.737e-04 3.166e-04 I

(20fS)

(22.86 em) 7.S92e-02 1.3S4e-Ol 1.474e-04 2.628e-04 I

(30fS)

(2S.4 em) 6.470e-02 1.137e-Ol 1.2S6e-04 2.206e-04 I

(40fS)

(27.94 em)

S.S42e-02 9.632e-02 1.076e-04 1.86ge-04 I

(S ofS)

(30.48 em) 4.774e-02 8.236e-02 9.26ge-OS l.S98e-04

Date 12/2/2011 Filename Case 1 Case Title Description Geometry Height Radius A

X

  1. 1 0.0 cm (0 in).2 MicroShield' Code Runs MicroShield 8.03 EnergySolutions (8.03-0000)

By Robert F. Decker Run Date December 2, 2011 Project Info Run Time 12:50:29 PM 95% Cs-137 5% Co-60 Cs-137/Co-60 2.54 - 12.7 cm 8 - Cylinder Volume - End Shields Source Dimensions 15.24 cm (6.0 in) 25.0 em (9.8 in)

Dose Points y

20.32 em (S.O in)

Shields z

0.0 em (0 in)

Shield N Source Air Gap Dimension Material Sand Air Density 1.6 0.00122 Nuclide Ba-137m Co-60 Cs-137 2.9ge+04 em' Source Input: Grouping Method - Actual Photon Energies Ci Bq "Cilcm' 4.3028e-00S 2.393ge-009 4.5484e-008 1.5920e+003 S.S574e+001 1.6S29e+003 1.437ge-006 S.OOOOe-OOS 1.5200e-006 Buildup: The material reference is Source Integration Parameters Radial Circumferential Y Direction (axial)

Results EH&S TSD # 11-004 Revision 00 Page 27 of48 Checked Duration 00:00:00 Bq/cm' 5.3203e-002 2.9600e-003 5.6240e-002 20 10 10

.2 EH&S TSD # 11-004 MicroShield' Code Runs Revision 00 Page 28 of 48 Fluence Rate Fluence Rate Exposure Rate Exposure Rate Energy (MeV) Activity (Photons/sec) MeV/cmz/sec MeV/cmz/sec mRlhr mRlhr No Buildup With Buildup No Buildup With Buildup 0.004S 1.6S3e+Ol 7.107e-OS 7.323e-OS 4.S71e-OS S.020e-OS 0.031S 3.296e+Ol S.S71e-06 1.09Se-OS 7.3Sge-OS 9.11ge-OS 0.0322 6.0S1e+Ol 1.707e-OS 2.121e-OS 1.374e-07 1.707e-07 0.0364 2.213e+Ol 9.516e-06 1.272e-OS S.407e-OS 7.226e-OS 0.6616 1.433e+03 S.49Se-02 l.SS0e-01 1.647e-04 3.004e-04 0.693S 1.44Se-02 9.120e-07 1.63ge-06 1.761e-09 3.16Se-09 1.1732 S.SS7e+Ol 1.112e-02 1.721e-02 1.9S7e-OS 3.07Se-OS 1.332S S.SS7e+Ol 1.311e-02 1.964e-02 2.27Se-OS 3.40Se-OS Totals 1.742e+03 1.092e-01 1.91ge-01 2.076e-04 3.656e-04 Sensitivity Variable Y Dose Point 1 (I of 5)

(20.32 cm) 0.004S 1.6S3e+Ol

7. 1 07e-OS 7.323e-OS 4.S71e-OS S.020e-OS 0.031S 3.296e+Ol S.S71e-06 1.09Se-OS 7.3Sge-OS 9.11ge-OS 0.0322 6.0S1e+Ol 1.707e-OS 2.121e-05 1.374e-07 1.707e-07 0.0364 2.213e+Ol 9.S16e-06 1.272e-OS S.407e-OS 7.226e-OS 0.6616 1.433e+03 S.49Se-02 l.SS0e-01 1.647e-04 3.004e-04 0.693S 1.44Se-02 9.120e-07 1.63ge-06 1.761e-09 3.16Se-09 1.1732 S.SS7e+Ol 1.112e-02 1.721e-02 1.9S7e-OS 3.07Se-OS 1.332S S.SS7e+Ol 1.311e-02 1.964e-02 2.27Se-OS 3.40Se-OS Totals 1.742e+03 1.092e-01 1.91ge-01 2.076e-04 3.656e-04 Sensitivity Variable Y Dose Point 1 (2 of 5)

(22.86 cm) 0.004S 1.6S3e+Ol 6.273e-OS 6.461e-OS 4.300e-OS 4.42ge-OS 0.031S 3.296e+Ol 7.SlOe-06 9.63Se-06 6.S0Se-OS S.026e-OS 0.0322 6.0S1e+Ol l.503e-OS l.S66e-OS 1.20ge-07 l.502e-07 0.0364 2.213e+Ol S.360e-06 1.116e-OS 4.750e-OS 6.341e-OS 0.6616 1.433e+03 7.20ge-02 1.2S6e-Ol 1.39Se-04 2.493e-04 0.693S 1.44Se-02 7.734e-07 1.360e-06 1.493e-09 2.626e-09 1.1732 S.SS7e+Ol 9.36Se-03 1.423e-02 1.673e-OS 2.S43e-OS 1.3325 S.SS7e+Ol 1.103e-02 1.623e-02 1.913e-OS 2.S17e-OS Totals 1.742e+03 9.25Ie-02 1.591e-01 1.75ge-04 3.033e-04

.2 EH&S TSD # 11-004 MicroShield' Code Runs Revision 00 Page 29 0148 Sensitivity Variable Y Dose Point 1 (3 of 5)

(25.4 cm) 0.0045 1.653e+Ol 5.504e-OS 5.66Se-OS 3.773e-OS 3.SS5e-OS 0.031S 3.296e+Ol 6.S40e-06 S.436e-06 5.697e-OS 7.027e-OS 0.0322 6.0S1e+Ol 1.316e-05 1.633e-05 1.05ge-07 1.314e-07 0.0364 2.213e+Ol 7.312e-06 9.757e-06 4.l55e-OS 5.543e-OS 0.6616 1.433e+03 6.144e-02 1.07ge-01 1.191e-04 2.093e-04 0.693S 1.445e-02 6.5Sge-07 1.141e-06 1.272e-09 2.203e-09 1.1732 S.S57e+Ol 7.941e-03 1.192e-02 1.41ge-05 2.l30e-05 1.3325 S.S57e+Ol 9.340e-03 1.35ge-02 1.620e-05 2.357e-05 Totals 1.742e+03 7.875e-02 1.335e-Ol 1.498e-04 2.544e-04 Sensitivity Variable Y Dose Point 1 (4 of 5)

(27.94 cm) 0.0045 1.653e+Ol 4.S12e-OS 4.955e-OS 3.29ge-OS 3.396e-OS 0.031S 3.296e+Ol 5.976e-06 7.36ge-06 4.97Se-OS 6.13Se-OS 0.0322 6.0S1e+Ol 1.14ge-05 1.426e-05 9.251e-OS 1.14Se-07 0.0364 2.2 13 e+O1 6.3S3e-06 S.513e-06 3.627e-OS 4.S37e-OS 0.6616 1.433e+03 5.263e-02 9.1 47e-02 1.020e-04 1.773e-04 0.693S 1.445e-02 5.642e-07 9.66ge-07 1.0Sge-09 l.S67e-09 1.1732 S.S57e+Ol 6.77Se-03 1.00Se-02 1.211e-05 I.S02e-05 1.3325 S.S57e+Ol 7.965e-03 1.14ge-02 1.3S2e-05 1.994e-05 Totals 1.742e+03 6.739e-02 1.131e-Ol 1.282e-04 2.156e-04 Sensitivity Variable Y Dose Point 1 (50f5)

(30.48 cm) 0.0045 1.653e+Ol 4.202e-OS 4.326e-OS 2.SS0e-OS 2.966e-OS 0.031S 3.296e+Ol 5.21ge-06 6.434e-06 4.347e-OS 5.360e-OS 0.0322 6.0S1e+Ol 1.004e-05 1.245e-05 S.07Se-OS 1.002e-07 0.0364 2.213e+Ol 5.571e-06 7.42Se-06 3.165e-OS 4.220e-OS 0.6616 1.433e+03 4.533e-02 7.S21e-02 S.7S7e-05 1.516e-04 0.693S 1.445e-02 4.S5ge-07 S.267e-07 9.3S1e-l0 1.596e-09 1.1732 S.S57e+Ol 5.S24e-03 S.614e-03 1.041e-05 1.53ge-05 1.3325 S.S57e+Ol 6.S40e-03 9.S16e-03 1.1S7e-05 l.703e-05 Totals 1.742e+03 5.801e-02 9.667e-02 1.103e-04 1.843e-04 Sensitivity Analysis Summary - Y Dose Point 1 Dose Point # Sensitivity Sensitivity Fluence Rate Fluence Rate Exposure Rate Exposure Rate

.2 EH&S TSD # 11*004 MicroShield' Code Runs Revision 00 Page 30 0148 Dimension MeV/cm'/sec MeV/cm'/sec mRlhr mRlhr No Buildup With Buildup No Buildup With Buildup I

(1 of 5)

(20.32 em) 1.092e-Ol 1.91ge-Ol 2.076e-04 3.656e-04 1

(2 of 5)

(22.86 em) 9.251e-02 l.591e-Ol l.75ge-04 3.033e-04 1

(30f5)

(25.4 em) 7.875e-02 l.335e-Ol 1.498e-04 2.544e-04 1

(40f5)

(27.94 em) 6.73ge-02 1.131e-Ol 1.282e-04 2.156e-04 (5 of 5)

(30.48 em) 5.801e-02 9.667e-02 1.103e-04 1.843e-04

Date 12/2/2011 Filename Case 1 Case Title Description Geometry Height Radius A

X

  1. 1 0.0 em (0 in)

Shield N.2 MicroShield' Code Runs MicroShield 8.03 EnergySolutions (8.03-0000)

By Robert F. Decker Run Date December 2, 2011 Project Info Run Time 12:58:06 PM 90% Cs-13 7 10% Co-6 Cs-137/Co-60 2.54 - 12.7 em 8 - Cylinder Volume - End Shields Source Dimensions 15.24 em (6.0 in) 25.0 em (9.S in)

Dose Points y

z 20.32 em (S.O in)

Shields 0.0 em (0 in)

Dimension Source 2.99e+04 em' Material Sand Air Density 1.6 0.00122 Air Gap Nuclide Ba-137m Co-60 Cs-137 Source Input: Grouping Method - Actual Photon Energies Ci Bq "Cilcm' 4.0763e-00S 4.7S7Se-009 4.3090e-00S 1.50S2e+003 1.7715e+002 1.5943e+003 1.3 622e-006 1.6000e-007 1.4400e-006 Buildup: The material reference is Source Integration Parameters Radial Circumferential Y Direction (axial)

Results EH&S TSD # 11-004 Revision 00 Page 31 of48 Checked Duration 00:00:00 Bq/cm' 5.0403e-002 5.9200e-003 5.32S0e-002 20 10 10

.2 EH&S TSD # 11-004 MicroShield' Code Runs Revision 00 Page 32 of 48 Fluence Rate F1uence Rate Exposure Rate Exposure Rate Energy (MeV) Activity (Photons/sec) MeV/cm'/sec MeV/cm'/sec mRlhr mRlhr No Buildup With Buildup No Buildup With Buildup 0.0045 1.5600+01 6.733e-OS 6.93Se-OS 4.615e-OS 4.756e-OS 0.0318 3.123e+Ol 8.404e-06 1.037e-05 7.000e-08 8.63ge-08 0.0322 5.761e+Ol 1.617e-05 2.00ge-05 1.302e-07 1.617e-07 0.0364 2.096e+Ol 9.015e-06 1.205e-05 5.122e-08 6.846e-08 0.6616 1.357e+03 8.048e-02 1.468e-Ol 1.560e-04 2.846e-04 0.6938 2.S90e-02

1. 824e-06 3.278e-06 3.521e-09 6.32ge-09 1.1732 1.771e+02 2.224e-02 3.441e-02 3.974e-05 6.l50e-05 1.3325 1.771e+02 2.623e-02 3.92ge-02 4.550e-05 6.S16e-05 Totals 1.837e+03 1.290e-Ol 2.206e-Ol 2.416e-04 4.146e-04 Sensitivity Variable Y Dose Point 1 (lof5)

(20.32 cm) 0.0045 1.566e+Ol 6.733e-08 6.938e-08 4.615e-08 4.756e-08 0.0318 3.123e+Ol 8.404e-06 1.037e-05 7.000e-OS 8.63ge-OS 0.0322 5.761e+Ol 1.617e-05 2.00ge-05 1.302e-07 1.617e-07 0.0364 2.0900+01 9.015e-06 1.205e-05 5.l22e-08 6.S4OO-OS 0.6616 1.357e+03 8.048e-02 1.468e-Ol 1.560e-04 2.S4OO-04 0.6938 2.89Oc-02 l.824e-06 3.278e-06 3.521e-09 6.32ge-09 1.1732 1.771e+02 2.224e-02 3.441e-02 3.974e-05 6.150e-05 1.3325 1.771e+02 2.623e-02 3.92ge-02 4.550e-05 6.S16e-05 Totals 1.837e+03 1.290e-Ol 2.206e-0l 2.416e-04 4.146e-04 Sensitivity Variable Y Dose Point 1 (20f5)

(22.86 cm) 0.0045 1.566e+Ol 5.943e-08 6.121e-08 4.073e-08 4.1 96e-08 0.0318 3.123e+Ol 7.39ge-06 9.128e-06 6.163e-08 7.603e-08 0.0322 5.761e+Ol 1.424e-05 1.768e-05 1.146e-07 1.423e-07 0.0364 2.096e+Ol 7.920e-06 1.057e-05 4.500e-08 6.007e-08 0.6616 1.357e+03 6.830e-02 1.218e-Ol 1.324e-04 2.362e-04 0.6938 2.S9OC-02 1.547e-06 2.720e-06 2.986e-09 5.251e-09 1.1732 1.771e+02 l.S73e-02 2.846e-02 3.347e-05 5.0S6e-05 1.3325 1.771e+02 2.205e-02 3.247e-02 3.S26e-05 5.633e-05 Totals 1.837e+03 1.091e-Ol 1.828e-Ol 2.044e-04 3.437e-04

.2 EH&S TSD # 11-004 MicroShield' Code Runs Revision 00 Page 33 of48 Sensitivity Variable Y Dose Point 1 (30f5)

(25.4 em) 0.0045 l.566e+Ol 5.214e-08 5.36ge-08 3.574e-08 3.680e-08 0.0318 3.123e+Ol 6.480e-06 7.992e-06 5.398e-08 6.657e-08 0.0322 5.761e+Ol l.247e-05 l.547e-05 l.003e-07 l.245e-07 0.0364 2.096e+Ol 6.928e-06 9.243e-06 3.936e-08 5.252e-08 0.5616 1.357e+03 5.821e-02 l.023e-01 1.128e-04 l.982e-04 0.6938 2.890e-02 1.318e-06 2.282e-06 2.544e-09 4.407e-09 1.1732 l.771e+02 l.588e-02 2.383e-02 2.838e-05 4.25ge-05 1.3325 l.771e+02 l.868e-02 2.718e-02 3.241e-05 4.715e-05 Totals 1.837e+03 9.280e-02 1.533e-Ol 1.73ge-04 2.883e-04 Sensitivity Variable Y Dose Point 1 (4of5)

(27.94 em) 0.0045 l.566e+Ol 4.55ge-08 4.694e-08 3.l25e-08 3.218e-08 0.0318 3.123e+Ol 5.661e-06 6.981e-06 4.716e-08 5.815e-08 0.0322 5.761e+Ol l.08ge-05 1.351e-05 8.764e-08 l.088e-07 0.0364 2.096e+Ol 6.047e-06 8.065e-06 3.436e-08 4.582e-08 0.6616 1.357e+03 4.986e-02 8.666e-02 9.666e-05 1.680e-04 0.6938 2.890e-02 1.128e-06 1.934e-06 2.17ge-09 3.734e-09 1.1732 l.771e+02 1.356e-02 2.0 17e-02 2.422e-05 3.604e-05 1.3325 l.771e+02 l.593e-02 2.29ge-02 2.764e-05 3.988e-05 Totals 1.837e+03 7.937e-02 1.298e-Ol 1.487e-04 2.442e-04 Sensitivity Variable Y Dose Point 1 (5 of 5)

(30.48 em) 0.0045 l.566e+Ol 3.981e-08 4.09ge-08 2.72ge-08 2.80ge-08 0.0318 3.123e+Ol 4.944e-06 6.096e-06 4.118e-08 5.078e-08 0.0322 5.761e+Ol 9.51Oe-06 1.180e-05 7.653e-08 9.496e-08 0.0364 2.096e+Ol 5.278e-06 7.037e-06 2.99ge-08 3.998e-08 0.6616 1.357e+03 4.294e-02 7.4lOe-02 8.325e-05 l.436e-04 0.6938 2.890e-02 9.718e-07 l.653e-06 l.876e-09 3.192e-09 1.1732 l.771e+02 1.165e-02 1.723e-02 2.081e-05 3.07ge-05 1.3325 l.771e+02 1.368e-02 1.963e-02 2.373e-05 3.406e-05 Totals 1.837e+03 6.82ge-02 1.110e-Ol 1.280e-04 2.087e-04 Sensitivity Analysis Summary - Y Dose Point 1 Dose Point # Sensitivity Sensitivity Fluenee Rate Fluenee Rate Exposure Rate Exposure Rate

.2 EH&S TSD # 11-004 MicroShield' Code Runs Revision 00 Page 34 0148 Dimension MeV/cm'/sec MeV/cm'/sec mRlhr mRlhr No Buildup With Buildup No Buildup With Buildup (I of 5)

(20.32 em) 1.290e-01 2.206e-01 2.416e-04

4. 1 46e-04 (20f5)

(22.86 em) 1.091e-Ol 1.828e-01 2.044e-04 3.437e-04 1

(30f5)

(25.4 em) 9.280e-02 1.533e-01 l.73ge-04 2.883e-04 1

(40f5)

(27.94 em) 7.937e-02 1.298e-Ol 1.487e-04 2.442e-04 (5 of 5)

(30.48 em) 6.82ge-02 1.l10e-Ol 1.280e-04 2.087e-04

.3 Scan MOC for Various Nuclide Fractions of Co-60 and Cs-137 Soil Scan MDC For Ludlum 44-10 Nal Detector 100% Co*60 1.0 pCi/g Scan Rate 0.5 m/s d' 1.38 EH&S TSD # 11-004 Revision 00 Page 35 of 48 Detector end-cap 2.0" above Soil Surface @ Detector Centerline (7.62cm) 1218/2011 44-10 Bkg cpm 1.00E+03 2.00E+03 4.00E+03 6.00E+03 8.00E+03 1.00E+04 1.20E+04 1.40E+04 1.BOE+04 2.00E+04 4.00E+04 6.00E+04 8.00E+04 1.00E+OS 18.0 16.0 14.0 12.0

~ 10.0 u

Q.

8.0 6.0 4.0 2.0 0.0 Counts per 1.0 second 1.67E+Ol 3.33E+Ol 6.67E+Ol 1.00E+02 1.33E+02 1.67E+02 2.00E+02 2.33E+02 3.00E+02 3.33E+02 6.67E+02 1.00E+03 1.33E+03 1.67E+03

.-l_

O.OE+OO Detectable Detectable

~RlhlpCUg Exp. Rate Exp. Rate Detectable Microshield cpmJuRih Scan

=>

430 940 Exp. Rate Results MDC Co*60 Cs-137 MDCR MDCRaurvayor

~Rlh

~Rlh Total ~Rlh

@7.62cm pCi/g 3.38E+02 4.78E+02 1.11E+00 O.OOE+OO 1.11E+00 1.072 1.0 4.78E+02 6.76E+02 1.S7E+00 O.OOE+OO 1.S7E+00 1.072 1.47 6.76E+02 9.S6E+02 2.22E+00 O.OOE+OO 2.22E+00 1.072 2.07 8.28E+02 1.17E+03 2.72E+00 O.OOE+OO 2.72E+00 1.072 2.S4 9.S6E+02 1.3SE+03 3.14E+00 O.OOE+OO 3.14E+00 1.072 2.93 1.07E+03 1.SlE+03 3.S2E+00 O.OOE+OO 3.S2E+00 1.072 3.28 1.1 7E+03 1.66E+03 3.8SE+00 O.OOE+OO 3.8SE+00 1.072 3.S9 1.26E+03 1.79E+03 4.16E+00 O.OOE+OO 4.16E+00 1.072 3.88 1.43E+03 2.03E+03 4.72E+00 O.OOE+OO 4.72E+00 1.072 4.40 1.SlE+03 2.14E+03 4.97E+00 O.OOE+OO 4.97E+00 1.072 4.64 2.14E+03 3.02E+03 7.03E+00 O.OOE+OO 7.03E+00 1.072 6.S6 2.62E+03 3.70E+03 8.61 E+OO O.OOE+OO 8.61 E+OO 1.072 8.03 3.02E+03 4.28E+03 9.94E+00 O.OOE+OO 9.94E+00 1.072 9.28 3.38E+03 4.78E+03 1.11E+Ol O.OOE+OO 1.11E+Ol 1.072 10.37 Co-60 100% Scan Speed 0.5 m/s MDC (in pCi/g) as a Function of Background I

. ~ -I:- 1 1 _' _I.

.'" ** -f 2 O"-f[ me "d-cs __. _

2.0E+04 4.0E+04 6.0E+04 8.0E+04 1.0E+OS Background (cpm)

,3 Scan MOC for Various Nuclide Fractions of Co-60 and Cs-137 EH&S TSD # 11-004 Revision 00 Page 36 of 48 12/8/2011 44-10 Bkg cpm 1.00e+03 2.00e+03 4.00e+03 6.00e+03 8.ooe+03 1.ooe+04 1.20e+04 1.40e+04 1.8CE+04 2.00E+04 4.0CE+04 6.0Ce+04 8.0CE+04 1.00E+05 121812011 44-10 Bkg cpm 1.ooe+03 2.ooe+03 4.ooE+03 6.ooe+03 8.00E+03 1.00E+04 1.20E+04 1.40E+04 1.80E+04 2.00E+04 4.0CE+04 6.00e+04 8.00E+04 1.00E+05 Soil Scan MDC For Ludlum 44-10 Nal Detector 100% CcHiO 1.0 pCUg Scan Rate 0.5 mi. d'1.38 Detector end-cap 3.0* above Soli Surface @ Detector Centerline (10.16cm)

Counts per 1.0 second 1.67E+Ol 3.33E+Ol 6.67E+Ol 1.ooE+02 1.33E+02 1.67E+02 2.00E+02 2.33E+02 3.ooE+02 3.33E+02 6.67E+02 1.ooE+03 1.33E+03 1.67E+03 cpm/uRih MDCR MDCR.._,

3.38E+02 4.78E+02 4.78E+02 6.76E+02 6.76E+02 9.56E+02 8.28E+02 1.17E+03 9.56E+02 1.35E+03 1.07E+03 1.51 E+03 1.17E+03 1.66E+03 1.26E+03 1.79E+03 1.43E+03 2.03E+03 1.51E+03 2.14E+03 2.14E+03 3.02E+03 2.62E+03 3.70E+03 3.02E+03 4.28E+03 3.38E+03 4.78E+03 Detectable Detectable

~RlhlpCUg Exp. Rate Exp. Rate Detectable Mlcroshleld 430 Co-SO

~Rlh 1.11E+OO 1.57E+00 2.22E+00 2.72E+00 3.14E+00 3.52E+00 3.85E+00 4.16E+OO 4.72E+OO 4.97E+OO 7.03E+OO 8.61E+00 9.94E+00 1.11E+01 940 Cs-137

~Rlh O.OOE+OO o.ooe+oo o.ooe+oo O.ooE+OO O.ooE+OO O.OOE+OO O.OOE+oo O.OOE+oo O.ooE+oo O.ooE+OO O.ooE+oo O.ooE+OO O.ooE+OO O.OOE+OO Exp. Rate Results Total ~Rlh

@ 10.16 em 1.11 E+OO 0.8975 1.57E+00 0.8975 2.22E+00 0.8975 2.72E+OO 0.8975 3.14E+OO 0.8975 3.52E+OO 0.8975 3.85E+00 0.8975 4.16E+00 0.8975 4.72E+00 0.8975 4.97E+00 0.8975 7.03E+00 0.8975 8.61 E+oo 0.8975 9.94E+00 0.8975 1.11 E+Ol 0.8975 Soil Scan MDC For Ludlum 44-10 Nal Detector 100% Co-60 1.0 pCl/g Scan Rate 0.5 mi. d' 1.38 Detector end-cap 5.0" above Soil Surface @ Detector Centerline (15.24cm)

Counts per 1.0 second 1.67E+Ol 3.33E+Ol 6.67E+01 1.00E+02 1.33E+02 1.67E+02 2.00E+02 2.33E+02 3.COE+02 3.33E+02 6.67E+02 1.00E+03 1.33E+03 1.67E+03 cpmluRih MDCR MDCR......,.,

3.38E+02 4.78E+02 4.78E+02 6.76E+02 6.76E+02 9.56E+02 8.28E+02 1.17E+03 9.56E+02 1.35E+03 1.07E+03 1.51 E+03 1.17E+03 1.66E+03 1.26E+03 1.79E+03 1.43E+03 2.03E+03 1.51E+03 2.14E+03 2.14E+03 3.02E+03 2.62E+03 3.70E+03 3.02E+03 4.28E+03 3.38E+03 4.78E+03 Detectable Detectable

~Rlh/pCl/g Exp. Rate Exp. Rate Detectable Mlcroshlold 430 CcHiO

~h 1.11E+00 1.57E+00 2.22E+00 2.72E+00 3.14E+00 3.52E+00 3.85E+00 4.16E+00 4.72E+00 4.97E+00 7.03E+OO 8.61E+00 9.94E+00 1.1 1E+Ol 940 Cs-137

~h O.ooE+OO O.ooE+oo O.OOE+oo O.OOE+oo O.OOE+oo O.OOE+oo O.OOE+OO O.OOE+OO O.OOE+OO O.OOE+OO O.OOE+OO O.OOE+OO O.ooE+OO O.ooE+OO Exp. Rate Total ~RIh 1.11E+00 1.57E+00 2.22E+00 2.72E+00 3.14E+00 3.52E+00 3.85E+00 4.16E+00 4.72E+00 4.97E+00 7.03E+00 8.61E+00 9.94E+00 1.11E+Ol Results

@l1S.24em 0.6485 0.6485 0.6485 0.6485 0.6485 0.6485 0.6485 0.6485 0.6485 0.6485 0.6485 0.6485 0.6485 0.6485 Scan MDC pCl/g 1.2 1.75 2.48 3.03 3.50 3.92 4.29 4.63 5.26 5.54 7.83 9.59 11.08 12.39 Scan MDC pCi/g 1.7 2.42 3.43 4.20 4.85 5.42 5.94 6.41 7.27 7.67 10.84 13.28 15.33 17.14

,3 Scan MOC for Various Nuclide Fractions of Co-60 and Cs-137 EH&S TSD # 11-004 Revision 00 Page 37 of 48 Soil Scan MOC For Ludlum 44-10 Nal Detector 100% Cs-137 1.0 pCUg d'.1.38 Scan Speed = 0.5 mi.

Detector end-cap 2.0" above 5011 Surface C!l Detector Centerline (7.82cm)

Area of Interest* 50 cm dia.; d' = 1.38 Detectable Detectable

~RlhlpCJ/g 121812011 Exp. Rate Exp. Rate Detectable Mlcroshleld Counts cpm/uRih 44-10 Bkg per

=>

430 940 Exp. Rate Results 1.0 Co-SO Cs-137 cpm second MDCR MDCRsutY8)'Ot

~Rlh

~Rlh Total ~Rlh

@7.S2cm 1.00E+03 1.67E+Ol 3.38E+02 4.78E+02 O.OOE+OO 5.09E-Ol 5.09E-Ol 0.2628 2.00E+03 3.33E+Ol 4.78E+02 6.76E+02 O.OOE+OO 7.19E-Ol 7.19E-Ol 0.2628 4.0CE+03 6.67E+Ol 6.76E+02 9.56E+02 O.OOE+OO 1.02E+00 1.02E+00 0.2628 6.00E+03 1.00E+02 8.28E+02 1.1 7E+03 O.OOE+OO 1.25E+OO 1.25E+OO 0.2628 8.00E+03 1.33E+02 9.56E+02 1.35E+03 O.OOE+OO 1.44E+OO l.44E+OO 0.2628 l.OCE+04 1.67E+02 1.07E+03 1.51E+03 O.OOE+OO 1.61E+OO 1.61E+00 0.2628 1.2CE+04 2.00E+02 1.17E+03 1.66E+03 O.OOE+OO 1.76E+OO 1.76E+OO 0.2628 1.40E+04 2.33E+02 1.26E+03 1.79E+03 O.OOE+OO 1.90E+OO 1.90E+OO 0.2628 I.SOE+04 3.00E+02 1.43E+03 2.03E+03 O.OOE+OO 2.16E+OO 2.16E+OO 0.2628 2.00E+04 3.33E+02 1.51E+03 2.14E+03 O.OOE+OO 2.27E+00 2.27E+OO 0.2628 4.00E+04 6.67E+02 2.14E+03 3.02E+03 O.OOE+OO 3.22E+OO 3.22E+OO 0.2628 6.00E+04 1.00E+03 2.62E+03 3.70E+03 O.OOE+OO 3.94E+00 3.94E+OO 0.2628 8.0CE+04 1.33E+03 3.02E+03 4.28E+03 O.OOE+OO 4.55E+00 4.55E+00 0.2628 1.0CE+05 1.67E+03 3.38E+03 4.78E+03 O.OOE+OO 5.0SE+00 5.09E+00 0.2628

" ~- --~---~--- --.. _.-

C5-137 100% Scan Speed 0.5 m/5 MOe (In pCI/g) as a Function of Background 32.0 30.0 28.0 26.0 24.0 22.0 20.0

~ 18.0

~ 16.0 14.0 12.0 10.0 8.0 6.0 4.0 2.0 0.0

!7'

~

i O.OE+OO

~

r pO",,-

- ~

2.0E+04 i=-f=

r=-

=

,~.-0_

".... ' - r-

'2' 1= I-

--=..

1=

~

=

1=

  • 1=

4.0E+04 6.0E+04 Background cpm r= L + -,

L 1 I 1

6 from nd.1~1 I

1 1

1

. l' 3.c/!.from.enb-ca frO.I eJ" 1

1-=

~

ca~

1-r I

. ~

1=' 8.0E+04 1.0E+05

~_. J Scan MDC pCl/g 1.9 2.74 3.87 4.74 5.47 6.12 6.70 7.24 8.21 8.65 12.24 14.99 17.31 19.35

.3 Scan MOC for Various Nuclide Fractions of Co-60 and Cs-137 EH&S TSD # 11-004 Revision 00 Page 38 of48 121812011 44*10 Bkg cpm 1.00E+03 2.00E+03 4.00E+03 6.00E+03 8.00E+03 1.00E+04 1.20E+04 1.40E+04 1.80E+04 2.00E+04 4.00E+04 6.00E+04 8.00E+04 1.00E+05 121812011 44*10 Bkg cpm 1.00E+03 2.00E+03 4.00E+03 6.00E+03 8.00E+03 1.00E+04 1.20E+04 1.40E+04 1.80E+04 2.00E+04 4.00E+04 6.00E+04 8.00E+04 1.0CE+05 Soil Scan MOe For Ludlum 44-10 Nal Detector 100% Cs*1371.0 pCilg d' = 1.38 Scan Speed = 0.5 mi.

Detector end-cap 3.0" above Soil Surface @ Detector Centerline (10.16cm)

Counts per 1.0 second 1.67E+01 3.33E+Ol 6.67E+Ol 1.00E+02 1.33E+02 1.67E+02 2.00E+02 2.33E+02 3.00E+02 3.33E+02 6.67E+02 1.00E+03 1.33E+03 1.67E+03 cpm/uRih

=>

MDCR MDCR"""""

3.38E+02 4.78E+02 4.78E+02 6.76E+02 6.76E+02 9.56E+02 8.28E+02 1.17E+03 9.56E+02 1.35E+03 1.07E+03 1.51 E+03 1.17E+03 1.66E+03 1.26E+03 1.79E+03 1.43E+03 2.03E+03 1.51E+03 2.14E+03 2.14E+03 3.02E+03 2.62E+03 3.70E+03 3.02E+03 4.28E+03 3.38E+03 4.78E+03 Detectable Detectable

~RlhlpCUg Exp. Rate Exp. Rate Detectable Microshield 430 Co*50

~Rlh O.OOE+OO O.OOE+OO O.OOE+OO O.OOE+OO O.OOE+OO O.OOE+OO O.OOE+OO O.OOE+OO O.OOE+OO O.OOE+OO O.OOE+OO O.OOE+OO O.OOE+OO O.OOE+OO 940 Cs*137

~Rlh 5.09E-01 7.19E-01 1.02E+00 1.25E+00 1.44E+00 1.61E+00 1.76E+00 1.90E+00 2.16E+00 2.27E+00 3.22E+00 3.94E+00 4.55E+00 5.09E+00 Exp. Rate Total ~Rlh 5.09E-Ol 7.19E-Ol 1.02E+00 1.25E+00 1.44E+00 1.61E+00 1.76E+00 1.90E+00 2.16E+00 2.27E+00 3.22E+00 3.94E+00 4.55E+00 5.09E+00 Results

@10.15cm 0.2206 0.2206 0.2206 0.2206 0.2206 0.2206 0.2206 0.2206 0.2206 0.2206 0.2206 0.2206 0.2206 0.2206 Soil Scan MDC For Ludlum 44-10 Nal Detector 100% Cs-1371.0 pCilg d' = 1.38 Scan Speed = 0.5 mi.

Detector end*cap 5.0" above Soil Surface @ Detector Centerline (15.24 cm)

Counts per 1.0 second 1.67E+C1 3.33E+01 6.67E+01 1.00E+02 1.33E+02 1.67E+02 2.00E+02 2.33E+02 3.00E+02 3.33E+02 6.67E+02 1.00E+03 1.33E+03 1.67E+03 cpm/uRih

=>

MDCR MDCR"...,..,

3.38E+02 4.78E+02 4.78E+02 6.76E+02 6.76E+02 9.56E+02 8.28E+02 1.17E+03 9.56E+02 1.35E+03 1.07E+03 1.51 E+03 1.17E+03 1.66E+03 1.26E+03 1.79E+03 1.43E+03 2.03E+03 1.51E+03 2.14E+03 2.14E+03 3.02E+03 2.62E+03 3.70E+03 3.02E+03 4.28E+03 3.38E+03 4.78E+03 Detectable Detectable

~RlhlpCUg Exp. Rate Exp. Rate Detectable Microshield 430 Co*50

~Rlh O.OOE+OO O.OOE+OO O.OOE+OO O.OOE+OO O.OOE+OO O.OOE+OO O.OOE+OO O.OOE+OO O.OOE+OO O.OOE+OO O.OOE+OO O.OOE+OO O.OOE+OO O.OOE+OO 940 Cs*137

~Rlh 5.09E-01 7.19E-01 1.02E+00 1.25E+00 1.44E+00 1.61E+00 1.76E+00 1.90E+00 2.16E+00 2.27E+00 3.22E+00 3.94E+00 4.55E+00 5.09E+00 Exp. Rate Total ~Rlh 5.09E-01 7.19E-01 1.02E+00 1.25E+00 1.44E+00 1.61E+00 1.76E+00 1.90E+00 2.16E+00 2.27E+00 3.22E+00 3.94E+00 4.55E+00 5.09E+00 Results

@15.24cm 0.1598 0.1598 0.1598 0.1598 0.1598 0.1598 0.1598 0.1598 0.1598 0.1598 0.1598 0.1598 0.1598 0.1598 Scan MDC pCilg 2.3 3.26 4.61 5.65 6.52 7.29 7.99 8.63 9.78 10.31 14.58 17.86 20.62 23.05 Scan MDC pCi/g 3.2 4.50 6.36 7.80 9.00 10.06 11.02 11.91 13.50 14.23 20.13 24.65 28.46 31.82

.3 Scan MOC for Various Nuclide Fractions of Co-SO and Cs-137 Soil Scan MDC For Ludlum 44-10 Nal Detector 100% Cs-1371.0 pCUg Scan Rate = 0.25 mls d' = 1.38 EH&S TSD # 11-004 Revision 00 Page 39 of 48 Detector end-cap 2.0" above Soil Surface @ Detector Cente~in. (7.62 cm)

Detectable Detectable

~R1h1pCi/g 12/812011 Exp. Rate Exp. Rate Detectable Microshield Counts cpm/uRih Scan 44-10 Bkg per

=>

430 940 Exp. Rate Results MDC 0.5 Co-60 Cs-137 cpm second MDCR MDCRsurveyor

~R1h

~R1h Total ~R1h

@7.62cm pCi/g 1.00E+03 8.33E+00 2.39E+02 3.38E+02 O.OOE+OO 3.60E-01 3.60E-01 0.2628 1.4 2.00E+03 1.67E+01 3.38E+02 4.78E+02 O.OOE+OO 5.09E-01 5.09E-1l1 0.2628 1.94 4.00E+03 3.33E+01 4.78E+02 6.76E+02 O.OOE+OO 7.19E-1l1 7.19E-1l1 0.2628 2.74 6.00E+03 5.00E+01 5.85E+02 8.28E+02 O.OOE+OO 8.81E-01 8.81E-01 0.2628 3.35 8.00E+03 6.67E+01 6.76E+02 9.56E+02 O.OOE+OO 1.02E+00 1.02E+OO 0.2628 3.87 1.00E+04 8.33E+01 7.56E+02 1.07E+03 O.OOE+OO 1.14E+00 1.14E+00 0.2628 4.33 1.20E+04 1.00E+02 8.28E+02 1.17E+03 O.OOE+OO 1.25E+00 1.25E+00 0.2628 4.74 1.40E+04 1.17E+02 8.94E+02 1.26E+03 O.OOE+OO 1.35E+00 1.35E+00 0.2628 5.12 1.80E+04 1.50E+02 1.01E+03 1.43E+03 O.OOE+OO 1.53E+00 1.53E+00 0.2628 5.81 2.00E+04 1.67E+02 1.07E+03 1.51E+03 O.OOE+OO 1.61E+00 1.61E+00 0.2628 6.12 4.00E+04 3.33E+02 1.51E+03 2.14E+03 O.OOE+OO 2.27E+OO 2.27E+00 0.2628 8.65 6.00E+04 5.00E+02 1.85E+03 2.62E+03 O.OOE+OO 2.79E+00 2.79E+00 0.2628 10.60 8.00E+04 6.67E+02 2.14E+03 3.02E+03 O.OOE+OO 3.22E+00 3.22E+00 0.2628 12.24 1.00E+05 8.33E+02 2.39E+03 3.38E+03 O.OOE+OO 3.60E+00 3.60E+00 0.2628 13.68 Cs-137 100% Scan Speed 0.25 mls MDC (in pCi/g) as a Function of Background 24.0 22.0 20.0

i.

+

18.0 16.0 14.0

,. 12.0 u

CL 10.0 8.0 6.0 4.0 2.0 0.0

+- -

O.OE+OO 2.0E+04 4.0E+04 6.0E+04 8.0E+04 1.0E+05 Background cpm

,3 EH&S TSD # 11-004 Scan MOC for Various Nuclide Fractions of Co-60 and Cs-137 Revision 00 Page 40 of48 Soil Scan MDC For Ludlum 44-10 Nal Detector 100% Cs-137 1.0 pCUg Scan Rate = 0.25 m/s d' = 1.38 Delector end*cap 3.0" above Soil Surface @ Detector Cenlerline (10.16cm)

Delectable Delectable

~R1h1pCUg 12/812011 Exp. Rate Exp. Rate Detectable Microshield Counts cpm/uRlh Scan 44*10 Bkg per

=>

430 940 Exp. Rate Results MDC 0.5 Co-60 Cs*137 cpm second MDCR MDCRsurveyor

~R1h

~R1h Total ~R1h

@10.16cm pCi/g 1.00E+03 8.33E+00 2.39E+02 3.38E+02 O.OOE+OO 3.60E*Ol 3.60E*Ol 0.2206 1.6 2.00E+03 1.67E+Ol 3.38E+02 4.78E+02 O.OOE+OO 5.09E*Ol 5.09E*Ol 0.2206 2.31 4.00E+03 3.33E+Ol 4.78E+02 6.76E+02 O.OOE+OO 7.19E*Ol 7.19E*Ol 0.2206 3.26 6.00E+03 5.00E+Ol 5.85E+02 8.28E+02 O.OOE+OO 8.81E*Ol 8.81E-Ol 0.2206 3.99 8.00E+03 6.67E+Ol 6.76E+02 9.56E+02 O.OOE+OO 1.02E+00 1.02E+00 0.2206 4.61 1.00E+04 8.33E+Ol 7.56E+02 1.07E+03 O.OOE+OO 1.14E+00 1.14E+00 0.2206 5.15 1.20E+04 1.00E+02 8.28E+02 1.17E+03 O.OOE+OO 1.25E+00 1.25E+00 0.2206 5.65 1.40E+04 1.17E+02 8.94E+02 1.26E+03 O.OOE+OO 1.35E+00 1.35E+00 0.2206 6.10 1.80E+04 1.50E+02 1.01E+03 1.43E+03 O.OOE+OO 1.53E+00 1.53E+00 0.2206 6.92 2.00E+04 1.67E+02 1.07E+03 1.51E+03 O.OOE+OO 1.61E+00 1.61E+00 0.2206 7.29 4.00E+04 3.33E+02 1.51E+03 2.14E+03 O.OOE+OO 2.27E+00 2.27E+00 0.2206 10.31 6.00E+04 5.00E+02 1.85E+03 2.62E+03 O.OOE+OO 2.79E+00 2.79E+00 0.2206 12.63 8.00E+04 6.67E+02 2.14E+03 3.02E+03 O.OOE+OO 3.22E+00 3.22E+00 0.2206 14.58 1.00E+05 8.33E+02 2.39E+03 3.38E+03 O.OOE+OO 3.60E+00 3.60E+00 0.2206 16.30 Soil Scan MDC For Ludlum 44*10 Nal Detector 100% Cs*137 1.0 pCUg Scan Rale = 0.25 m/s d' = 1.38 Delector end*cap 5.0" above Soil Surface @ Detector Cenlerline (12.7cm)

Detectable Delectable

~R1h1pCUg 1218/2011 Exp. Rate Exp. Rate Detectable Microshield Counts cpm/uRlh Scan 44*10 Bkg per

=>

430 940 Exp. Rate Results MDC 0.5 Co*60 Cs*137 cpm second MDCR MDCR.urwyor

~R1h

~R1h Total ~R1h

@15.24cm pCi/g 1.00E+03 8.33E+00 2.39E+02 3.38E+02 O.OOE+OO 3.60E*Ol 3.60E*Ol 0.1598 2.3 2.00E+03 1.67E+Ol 3.38E+02 4.78E+02 O.OOE+OO 5.09E*Ol 5.09E*Ol 0.1598 3.18 4.00E+03 3.33E+Ol 4.78E+02 6.76E+02 O.OOE+OO 7.19E*Ol 7.19E*Ol 0.1598 4.50 6.00E+03 5.00E+Ol 5.85E+02 8.28E+02 O.OOE+OO 8.81E*Ol 8.81E*Ol 0.1598 5.51 8.00E+03 6.67E+Ol 6.76E+02 9.56E+02 O.OOE+OO 1.02E+00 1.02E+00 0.1598 6.36 1.00E+04 8.33E+Ol 7.56E+02 1.07E+03 O.OOE+OO 1.14E+00 1.14E+00 0.1598 7.12 1.20E+04 1.00E+02 8.28E+02 1.17E+03 O.OOE+OO 1.25E+00 1.25E+00 0.1598 7.80 1.40E+04 1.17E+02 8.94E+02 1.26E+03 O.OOE+OO 1.35E+00 1.35E+00 0.1598 8.42 1.80E+04 1.50E+02 1.01E+03 1.43E+03 O.OOE+OO 1.53E+00 1.53E+00 0.1598 9.55 2.00E+04 1.67E+02 1.07E+03 1.51E+03 O.OOE+OO 1.61E+00 1.61E+00 0.1598 10.06 4.00E+04 3.33E+02 1.51E+03 2.14E+03 O.OOE+OO 2.27E+00 2.27E+00 0.1598 14.23 6.00E+04 5.00E+02 1.85E+03 2.62E+03 O.OOE+OO 2.79E+00 2.79E+00 0.1598 17.43 8.00E+04 6.67E+02 2.14E+03 3.02E+03 O.OOE+OO 3.22E+00 3.22E+00 0.1598 20.13 1.00E+05 8.33E+02 2.39E+03 3.38E+03 O.OOE+OO 3.60E+00 3.60E+00 0.1598 22.50

,3 Scan MOC for Various Nuclide Fractions of Co-60 and Cs-137 EH&S TSD # 11-004 Revision 00 Page 41 of48 Soil Scan MDC For I.udlum 44-10 Nal Detector 95% Cs-137, 5% C0-60 1_0 pCUg d'.1_38 Scan Speed 0_5 mls Detector end-cap 2_0" above Soil SurfKe @ Detector Centerline (7_62 em) 121812011 Counts 44-10 Bkg per 1_0 epm second 1.00E+03 1.67E+Ol 2.00E+03 3.33E+Ol 4.00E+03 6.67E+Ol 6.00E+03 1.00E+02 8.00E+03 1.33E+02 1.00E+04 1.67E+02 1.20E+04 2.00E+02 1.4DE+04 2.33E+02 1.80E+04 3.00E+02 2.00E+04 3.33E+02 4.00E+04 6.67E+02 6.00E+04 1.00E+03 8.00E+04 1.33E+03 1.00E+05 1.67E+03 34.0 32.0 30.0 28.0 26.0 24.0 22.0 20.0

-a 18.0 Q, 16.0 14.0 12.0 10.0 8.0 6.0 4.0 2.0 0.0

" ~

O.OE+OO Detectable Detectable

~Rlh/pCilg Exp_ Rate Exp_ Rate Detectable Mleroshleld epm/uRih

=>

430 940 Exp_ Rate Retlul18 Co-SO Cs-137 MDCR MDCR.urv-yor

~Rlh

~Rlh Total ~Rlh

@7.S2om 3.38E+02 4.78E+02 5.56E-02 4.83E-Ol 5.39E-Ol 0.3033 4.78E+02 6.76E+02 7.86E-02 6.83E-01 7.62E-Ol 0.3033 6.76E+02 9.56E+02 1.11E-Ol 9.66E-01 1.08E+OO 0.3033 8.28E+02 1.17E+03 1.36E-01 1.18E+OO 1.32E+00 0.3033 9.56E+02 1.35E+03 1.57E-Ol 1.37E+OO 1.52E+OO 0.3033 1.07E+03 1.51E+03 1.76E-01 1.53E+00 1.70E+OO 0.3033 1.17E+03 1.66E+03 1.93E-Ol 1.67E+00 1.87E+OO 0.3033 1.26E+03 1.79E+03 2.08E-Ol 1.81E+OO 2.02E+OO 0.3033 1.43E+03 2.03E+03 2.36E-Ol 2.05E+OO 2.29E+OO 0.3033 1.51E+03 2.14E+03 2.49E-Ol 2.16E+OO 2.41 E+OO 0.3033 2.14E+03 3.02E+03 3.52E-Ol 3.06E+OO 3.41 E+OO 0.3033 2.62E+03 3.70E+03 4.31 E-Ol 3.74E+OO 4.17E+00 0.3033 3.02E+03 4.28E+03 4.97E-Ol 4.32E+OO 4.B2E+00 0.3033 3.38E+03 4.78E+03 5.56E-Ol 4.83E+00 5.39E+00 0.3033 C5-137 95% Co-60 5% Scan Speed 0.5 m/s MOC (in pCI/g) as a Function of Background

~

~ -~

~

~

r

~

~

~~

. -c -

=

i

. J I-=,=-, =

2.0E+04 4.0E+04 6.0E+04 8.0E+04 1.0E+05 Background cpm o

o

  • o _

Scan MDC pCI/g 1.8 2.51 3.55 4.35 5.02 5.62 6.15 6.65 7.54 7.94 11.23 13.76 15.89 17.76

.3 EH&S TSD # 11-004 Scan MOC for Various Nuclide Fractions of Co-60 and Cs-137 Revision 00 Page 42 0148 Soil Scan MDC For Ludlum 44-10 Nal Detector 95% Cs*137, 5% C<H!O 1.0 pCUg d'.1.38 Scan Speed 0.5 mls Detector end-cap 3.0* above Soli Surface @ Detector Cente~ine (10.16 em)

Detectable Detectable

~RlhlpCUg 121812011 Exp. Rate Exp. Rate Detectable Microshield Counts cpmluRih Scan 44-10 Bkg per

=>

430 940 Exp. Rate Resulls MDC 1.0 Co-60 Cs-137 cpm second MDCR MDCRsuIWYor

~Rlh

~Rlh Total ~Rlh

@10.16cm pCltg 1.00E+03 1.67E+01 3.38E+02 4.78E+02 5.56E-02 4.83E-01 5.39E-Ol 0.2544 2.1 2.00E+03 3.33E+01 4.78E+02 6.76E+02 7.86E-02 6.83E-Ol 7.62E-01 0.2544 2.99 4.00E+03 6.67E+01 6.76E+02 9.56E+02 1.11E-01 9.66E-Ol 1.08E+00 0.2544 4.24 S.OOE+03 1.00E+02 8.28E+02 1.17E+03 1.36E-01 1.18E+00 1.32E+00 0.2544 5.19 8.00E+03 1.33E+02 9.56E+02 1.35E+03 1.57E-01 1.37E+00 1.52E+OO 0.2544 5.99 1.00E+04 1.67E+02 1.07E+03 1.51E+03 1.76E-Ol 1.53E+OO 1.70E+OO 0.2544 6.70 1.20E+04 2.00E+02 1.17E+03 1.56E+03 1.93E-01 1.67E+OO 1.87E+OO 0.2544 7.34 1.40E+04 2.33E+02 1.26E+03 1.79E+03 2.08E-01 1.81E+OO 2.02E+OO 0.2544 7.92 1.80E+04 3.00E+02 1.43E+03 2.03E+03 2.36E-01 2.05E+OO 2.29E+OO 0.2544 8.98 2.00E+04 3.33E+02 1.51E+03 2.14E+03 2.49E-01 2.16E+OO 2.41E+OO 0.2544 9.47 4.00E+04 6.67E+02 2.14E+03 3.02E+03 3.52E-01 3.06E+OO 3.41E+OO 0.2544 13.39 6.00E+04 1.00E+03 2.62E+03 3.70E+03 4.31 E-01 3.74E+OO 4.17E+OO 0.2544 16.40 8.00E+04 1.33E+03 3.02E+03 4.28E+03 4.97E-01 4.32E+OO 4.82E+OO 0.2544 18.94 1.00E+05 1.67E+03 3.38E+03 4.78E+03 5.56E-01 4.83E+00 5.39E+00 0.2544 21.18 Soil Scan MDC For Ludlum 44-10 Nal Detector 95% Cs-137, 5% Co-60 1.0 pCUg d' =1.38 Scan Speed 0.5 mts Detector end-cap 5.0" above 5011 Surface @ Detector Centerline (15.24 cm)

Detectable Detectable

~RlhfpCUg 121812011 Exp. Rate Exp. Rate Detectable Mlcroshield Counts cpmtuRih Scan 44-10 Bkg per

=>

430 940 Exp. Rate Results MOC 1.0 Co-6O Cs-137 cpm second MDCR MDCR....,..

pR/h

~h Total~ @15.24em pCitg 1.00E+03 1.67E+01 3.38E+02 4.78E+02 5.56E-02 4.83E-Ol 5.39E-01 0.1843 2.9 2.00E+03 3.33E+01 4.78E+02 6.76E+02 7.86E-02 6.83E-Ol 7.62E-Ol 0.1843 4.13 4.00E+03 6.67E+01 6.76E+02 9.56E+02 1.11E-01 9.86E-01 1.08E+OO 0.1843 5.85 6.00E+03 1.00E+02 8.28E+02 1.17E+03 1.36E-01 1.18E+OO 1.32E+OO 0.1843 7.16 8.00E+03 1.33E+02 9.56E+02 1.35E+03 1.57E-01 1.37E+OO 1.52E+OO 0.1843 8.27 1.00E+04 1.67E+02 1.07E+03 1.51E+03 1.76E-01 1.53E+OO 1.70E+OO 0.1843 9.24 1.20E+04 2.00E+02 1.17E+03 1.66E+03 1.93E-01 1.67E+00 1.87E+00 0.1843 10.13 1.40E+04 2.33E+02 1.26E+03 1.79E+03 2.08E-Ol 1.81E+00 2.02E+00 0.1843 10.94 1.80E+04 3.00E+02 1.43E+03 2.03E+03 2.36E-01 2.05E+00 2.29E+00 0.1843 12.40 2.00E+04 3.33E+02 1.51E+03 2.14E+03 2.49E-01 2.16E+00 2.41E+00 0.1843 13.07 4.00E+04 6.67E+02 2.14E+03 3.02E+03 3.52E-01 3.06E+00 3.41E+00 0.1843 18.49 6.00E+04 1.00E+03 2.62E+03 3.70E+03 4.31 E-01 3.74E+00

4. 17E+OO 0.1843 22.64 8.00E+04 1.33E+03 3.02E+03 4.28E+03 4.97E-01 4.32E+OO 4.82E+OO 0.1643 26.14 1.00E+05 1.67E+03 3.36E+03 4.78E+03 5.56E-01 4.83E+OO 5.39E+OO 0.1 843 29.23

.3 Scan MOC for Various Nuclide Fractions of Co-60 and Cs-137 SOli Scan MDC For Ludlum 44-10 Hal Detector 90% Cs*137. 10% CcHiO 1.0 pCUg II' = 1.38 Scan Speed 0.5 mls EH&S TSD # 11-004 Revision 00 Page 43 of 48 Detector end-cap 2.0" above Soil Surface C!l Detector Centerline (7.82 em)

Detectable Detectable 121812011 Exp. Rate Exp. Rate Detectable Counts cpm/uRih 44-10 Bkg per

=>

430 940 Exp. Rate 1.0 Co-so Co-137 cpm second MDCR MDCR......,..

l'R1h l'R1h Tolall'R1h 1.00E+03 1.67E+Ol 3.38E+02 4.78E+02 1.IIE-lll 4.58E-lll 5.69E-lll 2.00E+03 3.33E+Ol 4.78E+02 S.76E+02 1.57E-lll 6.47E-lll B.05E-lll 4.00E+03 6.S7E+Ol 6.76E+02 9.56E+02 2.22E-lll

9. 15E-lll 1.14E+OO 6.00E+03 1.00E+02 B.28E+02 1.17E+03 2.72E-lll 1.12E+OO 1.39E+OO B.00E+03 1.33E+02 9.56E+02 1.35E+03 3.14E-lll 1.29E+OO 1.61E+OO 1.00E+04 1.67E+02 1.07E+03 1.51 E+03 3.52E-Ol 1.45E+00 1.80E+00 1.20E+04 2.00E+02 1.17E+03 1.66E+03 3.B5E-lll 1.59E+00 1.97E+00 1.40E+04 2.33E+02 1.26E+03 1.79E+03 4.16E-lll 1.71E+00 2.13E+00 1.80E+04 3.00E+02 1.43E+03 2.03E+03 4.72E-lll 1.94E+OO 2.41E+00 2.00E+04 3.33E+02 1.51E+03 2.14E+03 4.97E-lll 2.05E+OO 2.54E+OO 4.00E+04 6.67E+02 2.14E+03 3.02E+03 7.03E-lll 2.89E+OO 3.60E+OO 6.00E+04 1.00E+03 2.62E+03 3.70E+03 8.61E-lll 3.55E+OO 4.41E+OO 8.00E+04 1.33E+03 3.02E+03 4.28E+03 9.94E-lll 4.09E+OO 5.09E+00 1.00E+05 1.67E+03 3.38E+03 4.78E+03 1.IIE+OO 4.58E+00 5.69E+00 Cs-137 90% Co-60 10% Scan Speed 0.5 mls MDC (In pCl/g) as a Function of Background 28.0 t.? ;'0" 26.0 24.0 22.0 20.0 18.0
. -=-f='

.. 16.0

~ 14.0 12.0 10.0 8.0 6.0 4.0 2.0 0.0 1- '.=

,.,.. [i '

~

O.OE+OO if '"

.0

0-..

'==,,',

,0: :..:..:.

~ ~

~

-

2.0E+04

~ ~

--;:;'~',

[.~

~

=-

~

~ ~

4.0E+04 6.0E+04 8.0E+04 Background cpm llR/h1pCUg Microshield Results

@7.S2cm 0.3437 0.3437 0.3437 0.3437 0.3437 0.3437 0.3437 0.3437 0.3437 0.3437 0.3437 0.3437 0.3437 0.3437 I

1.0E+05

....J Scan MDC pCl/g 1.7 2.34 3.31 4.05 4.68 5.23 5.73 6.19 7.02 7.40 10.47 12.82 14.80 16.55

.3 EH&S TSD # 11-004 Scan MOC for Various Nuclide Fractions of Co-60 and Cs-137 Revision 00 Page 44 of 48 Soli Scan MDC For Ludlum 44*10 Nal Detector 90% C.*137,10% CcHiO 1.0 pCi/g If = 1.38 Scan Speed 0.5 mi.

Detector end-<:ap 3.0" above Soil Surface @l Detector Center1ine (10.16 em)

Detectable Detectable

~RlhlpCilg 121812011 Exp. Rate Exp. Rate Detectable Microshield Counts epm/uRih Scan 44*10 Bkg per 430 940 Exp. Rate Results MDC 1.0 Co-60 C.*137 epm second MDCR MDCR.urv.yot

~Rlh

~Rlh Total ~Rlh I!!J 10.16 em pClIg 1.00E+03 1.67E+01 3.38E+02 4.78E+02 1.11E'()1 4.58E'()1 5.69E*01 0.2883 2.0 2.00E+03 3.33E+01 4.78E+02 6.76E+02 1.57E'()1 6.47E'()1 8.05E'()1 0.2883 2.79 4.00E+03 6.67E+01 6.76E+02 9.66E+02 2.22E'()1 9.15E'()1 1.14E+OO 0.2883 3.95 6.00E+03 1.00E+02 8.28E+02 1.17E+03 2.72E'()1 1.12E+OO 1.39E+OO 0.2883 4.83 8.00E+03 1.33E+02 9.66E+02 1.35E+03

3. 14E.()1 1.29E+OO 1.61E+OO 0.2883 5.58 1.00E+04 1.67E+02 1.07E+03 1.51E+03 3.52E'()1 1.45E+00 1.80E+00 0.2883 6.24 1.20E+04 2.00E+02 1.17E+03 1.66E+03 3.85E*01 1.59E+00 1.97E+00 0.2883 6.84 1.40E+04 2.33E+02 1.26E+03 1.7BE+03 4.16E*01 1.71E+00 2.13E+00 0.2883 7.38 1.80E+04 3.00E+02 1.43E+03 2.03E+03 4.72E.()1 1.94E+00 2.41E+00 0.2883 8.37 2.00E+04 3.33E+02 1.51E+03 2.14E+03 4.97E'()1 2.05E+OO 2.54E+OO 0.2883 8.82 4.00E+04 6.67E+02 2.14E+03 3.02E+03 7.03E'()1 2.89E+OO 3.60E+OO 0.2883 12.48 6.00E+04 1.00E+03 2.62E+03 3.70E+03 8.61 E.()1 3.55E+OO 4.41E+OO 0.2883 15.28 8.00E+04 1.33E+03 3.02E+03 4.28E+03 9.94E'()1 4.09E+OO 5.0BE+00 0.2883 17.65 1.00E+05 1.67E+03 3.36E+03 4.78E+03 1.11E+OO 4.66E+00 5.69E+00 0.2883 19.73 Soli Scan MDC For Ludlum 44*10 Nal Detector 90% Co*137, 10% Co*SO 1.0 pCi/g d'
  • 1.38 Scan Speed 0.5 mi.

Detector end-cap 5.0" above Soil Surface @l Detector Centerline (IS.24om)

Detectable Detectable

~h1pCilg 121812011 Exp. Rate Exp. Rate Detectable Microstueld Counts epm/uRih Scan 44-10 Bkg per

~>

430 940 Exp. Rate Results MDC 1.0 Co-60 C.*137 epm second MDCR MDCR,.......

~Rlh

~Rlh Total ~Rlh I!!J 15.24 em pClIg 1.00E+03 1.67E+01 3.38E+02 4.78E+02 1.11E*01 4.S8E*01 S.69E*01 0.2087 2.7 2.00E+03 3.33E+01 4.78E+02 6.76E+02 1.S7E*01 6.47E'()1 8.0SE'()1 0.2087 3.85 4.00E+03 6.67E+01 6.76E+02 9.66E+02 2.22E'()1 9.15E.()1 1.14E+OO 0.2087 5.45 6.00E+03 1.00E+02 8.28E+02 1.17E+03 2.72E'()1 1.12E+OO 1.39E+OO 0.2087 6.68 8.00E+03 1.33E+02 9.56E+02 1.35E+03 3.14E'()1 1.29E+OO 1.61E+OO 0.2087 7.71 1.00E+04 1.67E+02 1.07E+03 1.S1E+03 3.52E'()1 1.45E+OO 1.80E+OO 0.2087 8.62 1.20E+04 2.00E+02 1.17E+03 1.88E+03 3.8SE*01 1.S9E+OO 1.B7E+00 0.2087 9.44 1.40E+04 2.33E+02 1.26E+03 1.79E+03 4.16E*01 1.71E+00 2.13E+00 0.2087 10.20 1.80E+04 3.00E+02 1.43E+03 2.03E+03 4.72E*01 1.94E+00 2.41E+00 0.2087 11.56 2.00E+04 3.33E+02 1.S1E+03 2.14E+03 4.B7E*01 2.05E+00 2.S4E+00 0.2087 12.19 4.00E+04 6.67E+02 2.14E+03 3.02E+03 7.03E*01 2.8BE+OO 3.60E+OO 0.2087 17.24 6.00E+04 1.00E+03 2.62E+03 3.70E+03 8.61 E.()1 3.55E+OO 4.41 E+OO 0.2087 21.11 8.00E+04 1.33E+03 3.02E+03 4.28E+03 9.94E'()1 4.09E+OO 5.09E+OO 0.2087 24.36 1.00E+05 1.67E+03 3.38E+03 4.78E+03 1.11E+OO 4.66E+OO S.69E+OO 0.2087 27.26

.3 Scan MOC for Various Nuclide Fractions of Co-SO and Cs-137 EH&S TSD # 11-004 Revision 00 Page 45 of4B Soli Scan MDC For Ludlum 44*10 Nal Detector 90% Cs*137,10% Co.oO 1.0 pCl/g d' = 1.38 Scan Speed 0.25 mi.

Detector end-cap 2.0" above Soli Surface @ Detector Cente~lne (7.52 cm) 121B12011 44-10 Bkg cpm 1.00E+03 2.00E+03 4.00E+03 B.00E+03 1.00E+04 1.20E+04 1.40E+04 1.80E+04 2.00E+04 4.00E+04 6.00E+04 B.OOE+04 1.00E+05 Counts per 0.5 second B.33E+OO 1.67E+Ol 3.33E+Ol 6.67E+Ol B.33E+Ol 1.00E+02 1.17E+02 1.50E+02 1.67E+02 3.33E+02 5.00E+02 6.67E+02 B.33E+02 20.0 18.0 16.0 14.0 12.0 1-,

-a 10.0 8.0 6.0 4.0 2.0 0.0 O.OE+OO Detectable Detectable "RlhlpCUg Exp. Rate Exp. Rate Detectable Microshleld cpm/uRlh

=>

MDCR MDCR.....,o.

2.39E+02 3.3BE+02 3.38E+02 4.7BE+02 4.7BE+02 6.76E+02 6.76E+02 9.56E+02 7.56E+02 1.07E+03 B.2BE+02 1.17E+03 B.94E+02 1.26E+03 1.01 E+03 1.43E+03 1.07E+03 1.51 E+03 1.51E+03 2.14E+03 I.B5E+03 2.62E+03 2.14E+03 3.02E+03 2.39E+03 3.38E+03 430 Co.oO "Rlh 7.86E-02 1.IIE-Ol 1.57E-Ol 2.22E-Ol 2.49E-Ol 2.72E-Ol 2.94E-Ol 3.34E-Ol 3.52E-Ol 4.97E-Ol 6.09E-Ol 7.03E-Ol 7.86E-Ol 940 Cs-137 "Rlh 3.24E-Ol 4.5BE-Ol 6.47E-Ol 9.15E-Ol 1.02E+00 1.12E+OO 1.21E+OO 1.37E+00 1.45E+00 2.05E+00 2.51E+OO 2.B9E+OO 3.24E+OO C$o137 90% Co-60 10% Scan Speed 0.2S MDC (in pCi/g) as a Function of Background t-- I t-.

2.0E+04 4.0E+04 6.0E+04 Background cpm Exp. Rate Total I'RIh 4.02E-Ol 5.69E-Ol B.05E-Ol 1.14E+00 1.27E+00 1.39E+OO 1.51E+OO 1.71E+OO I.BOE+OO 2.54E+00 3.12E+OO 3.50E+OO 4.02E+OO B.OE+04 Results

@7.62cm 0.3437 0.3437 0.3437 0.3437 0.3437 0.3437 0.3437 0.3437 0.3437 0.3437 0.3437 0.3437 0.3437

_J 1.0E+05

'------ -. --- --~----.-- ----- --- -~-------'

Scan MDC pCUg 1.2 1.66 2.34 3.31 3.70 4.05 4.3B 4.97 5.23 7.40 9.07 10.47 11.70

.3 Scan MOC for Various Nuclide Fractions of Co-SO and Cs-137 Soli Scan MDC For Ludlum 44-10 Nal Detector 90% Co-137, 10% Co-60 1.0 pCl/g d' = 1.38 Scan Speed 0.25 m/s EH&S TSD # 11-004 Revision 00 Page 46 of48 Detector end-<:ap 3.0* above Soli Surface @ Detector Centerline (10.16 cm)

Detectable Detectable

!1RfhIpCilg 1218/2011 Exp. Rate Exp. Rate Detectable Microshleld Counts cpm/uRlh Scan 44-10 Bkg per

=>

430 940 Exp. Rate Results MDC 0.5 Co-60 Co-137 cpm second MDCR MDCR.....,..

fLRIh

~Rlh Total~h @10.16em pCilg 1.00E+03 8.33E+OO 2.39E+02 3.38E+02 7.65E-02 3.24E-Ol 4.02E-Ol 0.2883 1.4 2.00E+03 1.67E+Ol 3.38E+02 4.78E+02 1.11 E-Ol 4.58E-Ol S.69E-01 0.2883 1.97 4.00E+03 3.33E+Ol 4.78E+02 6.76E+02 I.S7E-Ol 6.47E-Ol 8.0SE-Ol 0.2883 2.79 8.00E+03 6.67E+Ol 6.76E+02 9.S6E+02 2.22E-Ol 9.1SE-Ol 1.14E+00 0.2883 3.9S 1.00E+04 8.33E+Ol 7.58E+02 1.07E+03 2.49E-Ol 1.02E+OO 1.27E+00 0.28B3 4.41 1.20E+04 1.0oE+02 8.28E+02 1.17E+03 2.72E-Ol 1.12E+00 1.39E+Oo 0.2883 4.83 1.40E+04 1.17E+02 8.94E+02 1.26E+03 2.94E-Ol 1.21E+00 I.S1E+00 0.2883 S.22 1.80E+04 1.50E+02 l.oI E+03 1.43E+03 3.34E-Ol 1.37E+OO 1.71E+OO 0.2883 S.92 2.00E+04 1.67E+02 l.o7E+03 I.SIE+03 3.S2E-Ol 1.4SE+00 I.BOE+oO 0.2883 6.24 4.0oE+04 3.33E+02 I.SI E+03 2.14E+03 4.97E-ol 2.0SE+00 2.S4E+00 0.2883 8.B2 6.00E+04 S.00E+02 1.8SE+03 2.62E+03 6.09E-Ol 2.S1E+00 3.12E+Oo 0.28B3 10.81 8.00E+04 6.67E+02 2.14E+03 3.02E+03 7.03E-Ol 2.89E+00 3.60E+OO 0.2883 12.48 1.00E+OS 8.33E+02 2.39E+03 3.38E+03 7.65E-Ol 3.24E+OO 4.o2E+OO 0.2883 13.9S Soli Scan MDC For Ludlum 44-10 Nal Detector 90% Cs-137, 10% C0-60 1.0 pCl/g d'

  • 1.38 Detector end-<:ap 5.0" above Soil Surface @ Detector Centerline (15.24 em) Scan Speed 0.25 mls Detectable Detectable I1RfhIpCilg 1218/2011 Exp. Rate Exp. Rate Detectable Microshleld Counts cpmluRlh Scan 44-10 Bkg per

=>

430 940 Exp. Rate Results MDC 0.5 Co-6O C.-137 cpm second MDCR MDCR.w,.,..

~h fLRIh Total~h @15.24em pCl/g 1.00E+03 8.33E+00 2.39E+02 3.38E+02 7.65E-02 3.24E-Ol 4.02E-Ol 0.2087 1.9 2.00E+03 1.67E+Ol 3.38E+02 4.78E+02 1.11 E-Ol 4.S8E-Ol S.69E-Ol 0.2087 2.73 4.00E+03 3.33E+Ol 4.78E+02 6.76E+02 I.S7E-Ol 6.47E-Ol 8.0SE-Ol 0.2087 3.85 8.00E+03 6.67E+Ol 6.76E+02 9.S6E+02 2.22E-ol 9.1SE-ol 1.14E+00 0.2087 S.4S 1.00E+04 8.33E+Ol 7.58E+02 1.07E+03 2.49E-Ol l.o2E+00 1.27E+00 0.2087 6.10 1.20E+04 1.00E+02 8.28E+02 1.17E+03 2.72E-Ol 1.12E+OO 1.39E+OO 0.2087 6.68 1.40E+04 1.17E+02 8.94E+02 1.26E+03 2.94E-Ol 1.21E+OO I.SIE+OO 0.2087 7.21 1.80E+04 I.S0E+02 l.oIE+03 1.43E+03 3.34E-Ol 1.37E+OO 1.71E+00 0.2087 8.18 2.00E+04 1.67E+02 1.07E+03 I.SIE+03 3.S2E-Ol 1.4SE+00 1.80E+00 0.2087 8.62 4.00E+04 3.33E+02 I.SIE+03 2.14E+03 4.97E-Ol 2.0SE+00 2.54E+00 0.20B7 12.19 6.0oE+04 S.00E+02 1.B5E+03 2.62E+03 6.09E-Ol 2.S1E+00 3.12E+00 0.20B7 14.93 8.00E+04 6.67E+02 2.14E+03 3.02E+03 7.03E-Ol 2.89E+OO 3.60E+OO 0.2087 17.24 1.00E+OS B.33E+02 2.39E+03 3.3BE+03 7.65E-Ol 3.24E+OO 4.02E+OO 0.2087 19.27

.4 Scan MDC Formulas and pCi/g Determination Example EH&S TSD # 11-004 Revision 00 Page 47 of48 The NaI scan MDC utilizes the same formulas and approach as that found in NUREG -1507, Section 6.8.2 and NUREG-1575, Section 6.7 for open land areas. The following formula parameters are provided:

Scan speed:

0.25 and 0.5 mls Area of Interest:

50 cm diameter (0.196 m2) results in a scan width of 0.5 m Soil Depth:

6.0 inches (15.24 cm)

Soil Density:

1.6 g/cm3 Soil Composition:

Sand (Si(h Si = 46.74%, 0 = 53.26%)

Background Count Rate:

6.0E+03 cpm Surveyor Efficiency:

0.5 Detector Response (Co-60): 430 cpmliJ.RIh (See Table 1.0 and Attachment 8.1)

Detector Response (Cs-137): 940 cpml~ (See Table 1.0 and Attachment 8.1)

Index of Sensitivity (d'):

1.38 MDCR:

Minimum Detectable Count Rate (cpm)

MicroShield J.1RIhIpCi/g:

For varying distances and radionuclide mix (See Table below)

Icro Ie J.LI IP' 12 aues M'

Sh' Id' RIhI Ci/ V I Nuclide Nuclide Detector Distance Fraction Fraction Nuclide Nuclide to end cap Cs-13795%

Cs-13790%

Fraction Fraction Inches (cm)

Co-605%

Co-60 10%

Cs-137100%

Co-60 100%

2.0 (5.08) 0.3033 0.3437 0.2628 1.0720 3.0 (7.62) 0.2544 I

0.2883 0.2206 0.8975 I

4.0 (10.16) 0.2156 0.2442 0.1869 0.7593 5.0 (12.7) 0.1843 0.2087 0.1598 0.6485 To determine the MDC the MDCR must be calculated by [lIst determining the minimum detectable number of net source counts in the interval as given by Si.

SI = d'..jb; The value of d' is selected from Table 6.5 ofNUREG-1575 based on the required true positive and false positive rates and hi is the number of background counts in the interval. For a background count rate of 6.0E+03 cpm and a scan area of interest 50 cm diameter, a scan rate of 0.5 mls (resulting in a detector residence time of 1 second) then Si (MDCR) is 8.28E+02 cpm as determined below:

O.S m scan width (

) 1 s counts m

6.00E + 03 cpm --s = 100 -. ---"

O.S -

scan rate 60 -

mterval S

m

[

60s/m]

1.38-YlOO = 13.8 counts ls

= 828 cpm = MDCR = sl

.4 Scan MDC Formulas and pCi/g Determination Example EH&S TSD # 11-004 Revision 00 Page 480148 The MDCR is adjusted using the surveyor efficiency (MDCR.urveyor) using the following formula:

MDCR MDCRsurveyor = JP Where, p is the surveyor efficiency (0.5).

8Z8cpm rn;:

= 1,171 cpm = MDCRsurveyor vO.5 The MDCRsurveyor result is divided by the detector response factor for the radionuclide(s) in order to obtain I'R. TIlls illustration assumes 100% Cs-137 and the detector response factor is 940 cpm.

h

~ffl 1.171E + 03 cpm 940 cpm

'jil[7fi 1.246 J1R/h MicroShicld' runs were performed using the physical and survey parameters provided in this attaclunent to derive the I'R/jh conversion factors relative to nuclide mixture and detector end cap distance from the pC< 9 soil surface. The Table in this attaclunent lists the conversion factors for a mixture of 100% Cs-137 at different soil to detector distances. For a soil surface distance of 5 inches to the detector end cap the conversion factor is 0.1598. Based on the above derived /lR/h value of 1.246 the MDC for a detector background of 6,000 cpm is 7.8 pCi/g.

1.246¥ 0.1598 /lR!h pCL/g pCi 7.796-=MDC g

Attaclunent 8.3 illustrates the Ludlum Model 44-10 MDC (in pCi/ g) for different background values and mixtures ofCo-60 and Cs-137.

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