The following is a summary of information provided by the
Georgia Radioactive Materials Program via email:
The licensee reported that a source could not be returned to the locked shielded position following an exposure. A licensee radiation safety officer (RSO) reported to the scene with a source retrieval kit and attempted to retract the source. Initial attempts at straightening the guide tube were unsuccessful. Subsequently, it was noticed that a portion of the drive assembly conduit (return side) was melted due to being too close to a drop light. The drive assembly conduit (projection side) was disconnected from the crank handle and the source was successfully retracted into the locked shielded position by pulling the drive cable by hand. The exposure device was surveyed and secured.
While the source was exposed, a 2 mr/hr perimeter was established with continuous surveillance. The maximum dose received by a worker was to the RSO, who received 68 mrem, as indicated by a pocket dosimeter. The drive assembly will be removed from service until repairs can be made by the manufacturer.
Source: 67 Ci Ir-192, QSA model A424-9, s/n 16420P
Device: QSA 880 Delta Exposure, s/n D8607
Georgia incident number: 106