Event Notification Report for October 02, 2026

AGREEMENT STATE REPORT - LEAKING SOURCE

The following is a summary of information provided by the South Carolina Department of Environmental Services (the Department) via phone and email:

On August 28, 2026, the licensee reported that a 555 MBq (15 mCi) Ni-63 source was leaking. The source was part of a Perkin Elmer electron capture detector (ECD) (serial number 1488). A routine wipe test of the ECD was performed on July 26, 2026, with results indicating that the ECD had 222 Bq (0.006 uCi) of removable contamination wiped from the entrances port. The ECD was sent to Detector Service Center, LLC (North Carolina radioactive material license number 092-0660-1) for repair and was received back on August 24, 2026.

The licensee did not report any overexposures or ongoing health/safety concerns. This event is still under investigation by the Department.

South Carolina Event Number: SC260005

AGREEMENT STATE REPORT - STOLEN TROXLER GAUGES

The following information was provided by the Illinois Emergency Management Agency (the Agency) via phone and email:

"On September 24, 2026, a radioactive material inspector identified that OHLA Central, Inc. (IL-02482-01) failed to report to the Agency regarding two Troxler 3440P gauges stolen from a temporary jobsite located in Hinsdale, IL on June 30, 2025. The two gauges contained both Cs-137 (8 mCi) and Am-241(40 mCi) as of 6/20/17 for gauge, serial number 72854, and as of 6/12/2024 for gauge, serial number 88888.

"The licensee filed a police report and notified the manufacturer, Troxler Electronic Laboratories, Inc., on June 30, 2025.

"The licensee will be cited for failure to report the stolen gauges to the Agency as required by 340.1210 and failure to submit the required 30-day written report. This event also requires immediate reporting to U.S. Nuclear Regulatory Commission and notification has been made. The inspection will continue to determine root cause and confirm implementation of appropriate corrective actions."

Illinois Reference Number: IL260025

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 - MEDICAL EVENT

The following information was provided by the Illinois Emergency Management Agency (the Agency) via phone and email:

"The licensee advised on September 24th, 2026, that a patient was to be administered 0.77 GBq of Y-90 Theraspheres during a planned left hepatic lobe radioembolization treatment. The licensee reported that during administration, the authorized user was unable to deliver the Y-90 dose. Additional information was provided by the licensee on September 25th.

"The licensee reported that multiple dosimeter measurements demonstrated zero activity within the tubing/microcatheter connection and at the patient level and that the only measurable activity remained consistently at approximately 2.3 mRem/hr within the delivery box throughout the procedure. The procedure was aborted and the delivery system disassembled as usual. No contamination was found.

"As a precaution, the patient, delivery tubing, and source vial were sent for PET imaging to assess the location of the activity and exclude any unexpected distribution. PET-CT imaging of the patient indicated no microspheres were administered. However, as the administration had been initiated; this is being reported as an under-dose. The patient was notified following the procedure. The referring physician was to be notified by end of day today. The licensee is continuing their investigation and will submit a written report within 15 days as required."

Illinois Item Number: IL260026

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.

AGREEMENT STATE REPORT - MEDICAL EVENT

The following information was provided by the California Department of Public Health, Radiologic Health Branch (RHB) via email:

"On September 24, 2026, a patient with liver cancer was scheduled to receive two vials of Y-90 TheraSpheres at the University of California - Los Angeles (UCLA) Health Ronald Reagan Medical Center Interventional Radiology. The first vial was administered without incident. However, upon initiating administration of the second vial, an immediate leak was detected at the catheter connection hub, followed by retrograde flow from the catheter. The physician typically utilizes a Boston Scientific Direxion microcatheter; however, due to a supply backorder, an alternative microcatheter was used for the procedure. A TheraSphere representative was present during the administration and recorded the leak. A radiation survey confirmed the leak was fully contained with no floor contamination detected. Computed tomography (CT) imaging of the waste container indicates a possible catheter blockage per the treating radiologist. Once the waste decays to background levels, the catheter will be physically inspected to confirm the obstruction. The patient was notified by the treating physician that the second dose was not administered. Following a magnetic resonance imaging (MRI) assessment, a repeat Y-90 treatment may be scheduled for the untreated liver segment if clinically indicated.

"The prescribed dose for 'Segment 2' was 790 Gy (3 GBq vial) and the dose delivered was 771.6 Gy (or 97.7 percent of the prescribed dose).
"The prescribed dose for 'Segment 4' was 597 Gy (3 GBq vial) and the dose delivered was 0 Gy (or 0 percent of the prescribed dose).

"This investigation is still ongoing, a thorough description of all events and corrective actions will be sent to RHB in a 15-day report."

California 5010 number: 092526

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.