ENS 58094

v t e ENS Event
17:10 Dec 18, 2025
Title	Possible Overexposure
Event Description	The following is a summary of information provided by the licensee via phone and email: On December 18, 2025, at 1010 MST, a three-person crew was manipulating the digital radiology panel while setting up for their next shot. When the assistant attempted to push the lock slide on the camera, he noticed it was already in the unlocked position and realized the source was exposed. The crew did not hear their rate alarms activate. A survey was not performed at the time, as the survey meter was located at the cranks during the incident. Based on initial estimates, the crew was approximately one foot from the source. Work was stopped immediately. The licensee performed preliminary dose calculations assuming the crew was on the shielded side of the collimator for approximately 5 minutes at 1 foot, resulting in an estimated dose of 1.7 rem. All three film badges are currently en route for rush processing. Camera Information: Model - D8039 Source Serial Number: 24751P Activity - 64 curies of Ir-192

ENS 58094 +/-
Where
Mistras Group Inc Great Falls, Montana (NRC Region 4)
License number:	12-16559-02
Organization:	Mistras Group Inc
Reporting

10 CFR 20.2202(a)(1)
Time - Person (Reporting Time:+-2.97 h-0.124 days <br />-0.0177 weeks <br />-0.00407 months <br />)
Opened:	Matt Kim 14:12 Dec 18, 2025
NRC Officer:	Kerby Scales
Last Updated:	Dec 18, 2025
58094 - NRC Website
v • d • e

v t e Emergency Notification System
Mistras Group Inc with 10 CFR 20.2202(a)(1)
WEEKMONTHYEAR2025-12-18T17:10:00 [Table view]
[ENS list for Mistras Group Inc]

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