Print View Posted on: 23 December 2025
On 19.08.2025, an employee of a company carried out a non-destructive testing using a Se-75 source with an activity of 1.95 TBq. When winding back the source into its safety position in a tube, the source detached from its holder, so that the source remained in the collimator. When the radiation officer entered the bunker his electronic radiation protection dosimeter gave a warning signal. The radiation officer covered the tube and the collimator with several layers of lead. In total the worker stayed 10 seconds at a distance of 1 m close to the source. The monthly evaluation of the official dosimeter provided a value of 49.7 mSv for August 2025 exceeding the statutory annual whole body dose limit for workers.