Event Notification Report for December 12, 2025

EN Revision Imported Date: 12/12/2025<br><br>EN Revision Text: STOLEN MOISTURE DENSITY GAUGE

The following information was provided by the licensee via phone:

The licensee reported that an InstroTek model 3500 moisture density gauge (s/n 3478, 10 mCi Cs-137, 40 mCi Am-241/Be) was stolen from a vehicle parked overnight. A licensee employee found the gauge stolen with the locks securing the gauge to the vehicle cut with a bolt cutter. The gauge had been properly secured in its transport case in the vehicle. The licensee has reported the theft to the Jackson Police Department.

* * * UPDATE ON 12/11/2025 AT 1207 EST FROM G2 CONSULTING GROUP TO JORDAN WINGATE * * *

On October 25, 2025, the stolen gauge was recovered and returned to the licensee by LLE.

Notified R3DO (Nguyen), NMSS Events Notification (Email), ILTAB (Email), and CNSC Canada (Email).

THIS MATERIAL EVENT CONTAINS A 'Less than Cat 3' LEVEL OF RADIOACTIVE MATERIAL

Sources that are "Less than IAEA Category 3 sources," are either sources that are very unlikely to cause permanent injury to individuals or contain a very small amount of radioactive material that would not cause any permanent injury. Some of these sources, such as moisture density gauges or thickness gauges that are Category 4, the amount of unshielded radioactive material, if not safely managed or securely protected, could possibly - although it is unlikely - temporarily injure someone who handled it or were otherwise in contact with it, or who were close to it for a period of many weeks. For additional information go to http://www-pub.iaea.org/MTCD/publications/PDF/Pub1227_web.pdf

LOST AND RECOVERED RADIOACTIVE WASTE

The following is a summary of information provided by the licensee via phone and email:

On 8/26/25, waste was collected from the Central Missouri Cardiology clinic (CMC) and sent to a landfill. Later that day, the Missouri Department of Health and Human Services (DHSS) was notified that a radiological alarm was triggered at the landfill. DHSS agents responded to the incident on 8/28/25. Surveys were taken of the truck, resulting in a maximum reading of 3.8 mR/hr on contact. The truck was opened, and the radioactive trash bag was identified. The trash bag contained common waste items like napkins, food wrappers, nitrile gloves, and some medical packaging. The radioactive items were segregated from the rest of the waste.

On 9/3/25, the waste was collected and transferred to the CMC. The DHSS team placed the contaminated items into a bucket with a lid and secured the waste at their facility. The bucket was then placed in a large plastic trash bag and stored in the lead cave in the locked hot lab. The radiation safety staff investigation confirmed that no individual member of the public exceeded the annual dose limit of 100 mrem per 10 CFR 20.1301(a)(1). However, it may be possible that individuals could have received 2 mrem in any one hour per 10 CFR 20.1301(a)(2), if they were standing next to the dumpster prior to the pickup of the waste. The waste was identified as Rb-82, most likely in equilibrium with Sr-82, and possibly containing Sr-85. Based on all collected evidence, the most likely source of the radioactive waste was a routine exchange of a Sr-82/Rb-82 generator that was externally contaminated. The nuclear medicine technologist performing the exchange assumed their gloves were not contaminated and disposed of them in the non-radioactive trash.

THIS MATERIAL EVENT CONTAINS A 'Less than Cat 3' LEVEL OF RADIOACTIVE MATERIAL

Sources that are "Less than IAEA Category 3 sources," are either sources that are very unlikely to cause permanent injury to individuals or contain a very small amount of radioactive material that would not cause any permanent injury. Some of these sources, such as moisture density gauges or thickness gauges that are Category 4, the amount of unshielded radioactive material, if not safely managed or securely protected, could possibly - although it is unlikely - temporarily injure someone who handled it or were otherwise in contact with it, or who were close to it for a period of many weeks. For additional information go to http://www-pub.iaea.org/MTCD/publications/PDF/Pub1227_web.pdf

AGREEMENT STATE REPORT - STOLEN MOISTURE DENSITY GAUGE

The following information was provided by the California Department of Public Health via email:

"On December 4, 2025, the radiation safety officer (RSO) for Anbessaw Consulting, Inc., contacted the California Department of Public Health about a stolen moisture density gauge. The gauge was a CPN MC-3 Elite (S/N M30500858, 10 mCi Cs-137, 50 mCi Am-241/Be). The gauge was located on the floor of the rear seat of a locked pickup. The gauge was not secured to the vehicle frame, was not inside the gauge transportation box, and the trigger lock was not secured. The truck was located in the parking lot of the [gauge user's hotel] in Alameda, CA. The gauge was left in the vehicle around 1700-1745 PST on December 3, 2025, and was discovered missing around 0650 PST on December 4, 2025. After discovery of the missing gauge, the gauge user contacted their office to report the missing gauge [to the RSO around 0725 PST]. The gauge user went to the hotel front desk to see if they had any security cameras and was told they did not. The gauge user contacted the Alameda Police Department and filed a police report. The licensee's investigation into this event is ongoing and will be reviewed further by the California Department of Public Health."

California 5010 number: 120425

THIS MATERIAL EVENT CONTAINS A 'Less than Cat 3' LEVEL OF RADIOACTIVE MATERIAL

Sources that are "Less than IAEA Category 3 sources," are either sources that are very unlikely to cause permanent injury to individuals or contain a very small amount of radioactive material that would not cause any permanent injury. Some of these sources, such as moisture density gauges or thickness gauges that are Category 4, the amount of unshielded radioactive material, if not safely managed or securely protected, could possibly - although it is unlikely - temporarily injure someone who handled it or were otherwise in contact with it, or who were close to it for a period of many weeks. For additional information go to http://www-pub.iaea.org/MTCD/publications/PDF/Pub1227_web.pdf