The following information was received via email from the
Pennsylvania Department of Environmental Protection (the Department):
On August 24, 2023, the licensee informed the Department of an under-dose incident involving cesium-131 (Cs-131). It is reportable per 10 CFR 35.3045(a)(1).
On August 23, 2023 a patient received prostate seed therapy with Cs-131. The therapy plan detailed the need for 24 needles with 98 Cs-131 seeds total (1.8U/seed). A total of 107 Cs-131 seeds were received by the facility, based on the pre-plan volume. Devices used in the operation included: Ultrasound - BK Medical, BK 3000, serial number: 2003107; Planning System - Varian, Variseed 9.0, serial number: B29WL33; Stepper and applicator - CIVCO, Classic Stepper, serial number: 02107; MICK Medical, Mick TP applicator.
Seed assay was performed with the activity per seed within acceptable regulatory limits. However, after the medical procedure, more than 37 seeds were found unused. According to the plan, the unused number was supposed to be 9. Thus, a total of 70 seeds were implanted. The physician and patient have been informed. The patient received 201.9 mCi (70 seeds) of the 282.6 mCi (98 seeds) prescribed.
The cause of the event is unknown at this time. The Department will perform a reactive inspection. More information will be provided as received.
Pennsylvania Event Report ID No.: PA230023.
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.