10 CFR 20 Appendix E

Appendix E to Part 20--Nationally Tracked Source Thresholds

The Terabecquerel (TBq) values are the regulatory standard. The curie (Ci) values specified are obtained by converting from the TBq value. The curie values are provided for practical usefulness only and are rounded after conversion.

Radioactive material Category 1

(TBq) Category 1

(Ci) Category 2

(TBq) Category 2

(Ci)

Actinium-227 20 540 0.2 5.4

Americium-241 60 1,600 0.6 16

Americium-241/Be 60 1,600 0.6 16

Californium-252 20 540 0.2 5.4

Cobalt-60 30 810 0.3 8.1

Curium-244 50 1,400 0.5 14

Cesium-137 100 2,700 1 27

Gadolinium-153 1,000 27,000 10 270

Iridium-192 80 2,200 0.8 22

Plutonium-238 60 1,600 0.6 16

Plutonium-239/Be 60 1,600 0.6 16

Polonium-210 60 1,600 0.6 16

Promethium-147 40,000 1,100,000 400 11,000

Radium-226 40 1,100 0.4 11

Selenium-75 200 5,400 2 54

Strontium-90 1,000 27,000 10 270

Thorium-228 20 540 0.2 5.4

Thorium-229 20 540 0.2 5.4

Thulium-170 20,000 540,000 200 5,400

Ytterbium-169 300 8,100 3 81

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NRC website 10 CFR 20 Appendix E

v t e Code of Federal Regulations
Title 10 Part 20 - Standards for Protection Against Radiation
10 CFR: 1 2 4 5 7 9 10 11 12 13 14 15 16 19 20 21 25 26 30 31 32 33 34 35 36 37 39 40 50 51 52 54 55 60 61 62 63 70 71 72 73 74 75 76 81 95 100 140 150 160 170 171
1,001, General Provisions 1,002, Scope 1,003, Definitions 1,004, Units of radiation dose 1,005, Units of radioactivity 1,006, Interpretations 1,007, Communications 1,008, Implementation 1,009, Information collection requirements: OMB approval 1,101, Radiation Protection Programs 1,201, Occupational Dose Limits 1,202, Compliance with requirements for summation of external and internal doses 1,203, Determination of external dose from airborne radioactive material 1,204, Determination of internal exposure 1,205, 1,206, Planned special exposures 1,207, Occupational dose limits for minors 1,208, Dose equivalent to an embryo/fetus 1,301, Radiation Dose Limits for Individual Members of the Public 1,302, Compliance with dose limits for individual members of the public 1,401, Radiological Criteria for License Termination 1,402, Radiological criteria for unrestricted use 1,403, Criteria for license termination under restricted conditions 1,404, Alternate criteria for license termination 1,405, Public notification and public participation 1,406, Minimization of contamination 1,501, Surveys and Monitoring 1,502, Conditions requiring individual monitoring of external and internal occupational dose 1,601, Control of Exposure From External Sources in Restricted Areas 1,602, Control of access to very high radiation areas 1,701, Respiratory Protection and Controls to Restrict Internal Exposure in Restricted Areas 1,702, Use of other controls 1,703, Use of individual respiratory protection equipment 1,704, Further restrictions on the use of respiratory protection equipment 1,705, Application for use of higher assigned protection factors 1,801, Storage and Control of Licensed Material 1,802, Control of material not in storage 1,901, Precautionary Procedures 1,902, Posting requirements 1,903, Exceptions to posting requirements 1,904, Labeling containers 1,905, Exemptions to labeling requirements 1,906, Procedures for receiving and opening packages 2,001, Waste Disposal 2,002, Method for obtaining approval of proposed disposal procedures 2,003, Disposal by release into sanitary sewerage 2,004, Treatment or disposal by incineration 2,005, Disposal of specific wastes 2,006, Transfer for disposal and manifests 2,007, Compliance with environmental and health protection regulations 2,101, Records 2,102, Records of radiation protection programs 2,103, Records of surveys 2,104, Determination of prior occupational dose 2,105, Records of planned special exposures 2,106, Records of individual monitoring results 2,107, Records of dose to individual members of the public 2,108, Records of waste disposal 2,109, 2,110, Form of records 2,201, Reports 2,202, Notification of incidents 2,203, Reports of exposures, radiation levels, and concentrations of radioactive material exceeding the constraints or limits 2,204, Reports of planned special exposures 2,205, Reports to individuals of exceeding dose limits 2,206, Reports of individual monitoring 2,207, Reports of transactions involving nationally tracked sources 2,301, Exemptions and Additional Requirements 2,302, Additional requirements 2,401, Enforcement 2,402, Criminal penalties Appendices: 10 CFR 20 Appendix A 10 CFR 20 Appendix B 10 CFR 20 Appendix C 10 CFR 20 Appendix D 10 CFR 20 Appendix E 10 CFR 20 Appendix F 10 CFR 20 Appendix G, Requirements for Transfers of Low-Level Radioactive Waste Intended for Disposal at Licensed Land Disposal Facilities and Manifests

10 CFR 20 Appendix E

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