Event Notification Report for May 29, 2026

EN Revision Imported Date: 5/29/2026

EN Revision Text: AGREEMENT STATE REPORT - LOST/STOLEN TROXLER GAUGE

The following is a summary of information reported by the Florida Department of Health via email:

Terracon Consultants reported a Troxler 2440 gauge was stolen from a truck while the truck was parked at a residence in Brandenton, Florida. The gauge was stolen around 0930 EDT on 9/24/2020. The gauge was secured with two chains and two locks by the driver of the truck. The local police department has been notified. The gauge contained a 8 mCi Cs-137 source (S/N: 75-1841) and a 40 mCi Am241:Be source (S/N: 47-15958).

Florida Incident Number: FL20-109

* * * UPDATE ON 05/28/2026 AT 1506 EDT FROM JOHN WILLIAMSON TO SAMUEL COLVARD * * *

The following information was provided by the Florida Bureau of Radiation Control (BRC) via email and phone:

"On May 28, 2026, BRC was contacted by Florida Highway Patrol (FHP) regarding a sting involving a potentially stolen gauge being offered for sale online by an unlicensed individual. Photos match the gauge stolen on 9/24/2020 (see incident FL20-109). FHP set up a sting to recover the gauge. The gauge was recovered. FHP will deliver it to BRC for storage. The gauge does not have a transport case. BRC conducted a wipe test (negative) and verified that both sources are intact. Tag AK-02 issued.

"BRC will hold the gauge until FHP no longer has a legal need for the device. Terracon local and corporate radiation safety officers have been notified."

Notified R1DO (Warnek), ILTAB (email), and NMSS Events Notifications (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

EN Revision Imported Date: 5/29/2026

EN Revision Text: AGREEMENT STATE REPORT - SOURCE HOLDER HANDLED BY NON-RADIATION WORKER

The following information was provided by the Utah Division of Radiation Control (the Division) via phone and email:

"Canyon Fuel Company, LLC contacted the Division to report that a source holder containing source material was removed from a fixed gauge by an electrician [non-radiation worker] working at the mine. The shutter was closed when the source holder was removed from the housing. This person was not authorized to remove the source holder.

"The source holder containing source material was removed due to rising water levels in the mine, which exceeded pumping capacity, to prevent the loss of equipment.

"The source holder with the source material is now secured in a lead-lined barrel, which is stored inside a closet secured with two locks.

"Neither dosimetry nor a survey meter was used during this process."

An investigation by the Division is pending.

NMED Event Report: UT260002
Model: Coalscan Model 2100
Serial Number: 4503
Source: 5 millicurie Cs-137 / 100 millicurie Am-241

* * * RETRACTION ON 05/28/2026 AT 1126 EDT FROM HEATHER MICKELSON TO CHRISTOPHER PRESCOTT * * *

The following is a summary of information that was provided by the Division via email:

Following an investigation, the Division determined that no dose concerns are associated with this incident. The worker's estimated exposure of 1.043 mrem was below the allowable occupational limits of 5 rem (Utah Administrative Code (UAC) R313-15-201), and consequently, the incident did not meet the criteria for a reportable event under UAC R313-15-1202 and R313-15-1203.

Notified: R4DO (Deese) and NMSS (email)

MEDICAL EVENT

The following information was provided by the licensee via phone:

On May 21, 2026, at 1203 EDT, a Y-90 TheraSphere treatment was ordered for a patient. The doctor prescribed an activity of 3.98 GBq for a desired dose of 65 Gy to the liver. After administration, the activity received was calculated to be 3.68 GBq (92.5 percent of the prescribed activity). However, the calculation for activity delivered to the perfuse liver tissue (i.e. tumor) was 3.14 GBq, 78.7 percent of the prescribed activity.

The authorized user and the health physicist were notified.

* * * RETRACTION ON 05/28/2026 AT 1058 EDT FROM KIM LOWE TO ROBERT THOMPSON * * *

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

The licensee reported that further evaluation of the event showed that a portion of the administered activity had shunted to the lungs. The licensee is therefore retracting the event after review of the reportability requirements in the applicable licensing guidance. The patient and treatment location had been evaluated for possible shunting pathways prior to the treatment in accordance with licensing guidance, greater than 90 percent of the planned activity was administered to the patient, and only 14.6 percent of the activity shunted to the lungs.

Notified R1DO (Warnek), NMSS Events Notification (email).

A Medical Event may indicate potential problems in a medical facility's use of radioactive materials. It does not necessarily result in harm to the patient.

FITNESS FOR DUTY

"On May 28, 2026, at 1109 CDT, it was determined that a non-licensed supervisor failed a test specified by the FFD testing program. The individual's authorization for site access has been terminated at South Texas Project. This has been determined to be reportable under 10 CFR 26.719(b)(2).

"The NRC Resident Inspector has been notified."