Event Notification Report for October 06, 2026

AGREEMENT STATE REPORT - MEDICAL EVENT

The following is a summary of information provided by the New York City Department of Health, Office of Radiological Health (the Office), via email:

On July 13, 2026, a yttrium-90 (Y-90) TheraSphere therapy procedure at Mount Sinai Medical Center resulted in an underdose to the patient's liver. During the procedure, some activity remained in the delivery system after treatment due to a catheter repositioning issue that paused the flow. The estimated dose delivered was approximately 205 Gy out of a prescribed 400 Gy.

The hospital initially determined the delivered dose was clinically adequate and retroactively updated the written directive to match the actual dose delivered. After further communication with the Office inspector, the hospital revised its assessment, acknowledged that the prescription should not have been changed post-administration, and classified the event as a medical event. A full report was provided to the Bureau on September 23, 2026.

New York City incident number: NY260003

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 - DAMAGED GAUGE

The following information was provided by the Texas Department of Health State Services (the Department) via phone and email:

"The licensee notified the Department regarding a stuck shutter on a fixed gauge on a dredge in a channel in Galveston Bay. The gauge is a Berthold S/N LD744-CR, containing a Co-60 source with original activity of 500 mCi as of September 2025. The source S/N is 12550925. The gauge is stuck open, the normal operating position. There is no threat to the general public due to the location of the gauge. Berthold is scheduling a service technician. Further information will be submitted in accordance with SA-300 requirements."

Texas incident number: 10332
Texas NMED number: TX260041