Exposure of a worker in excess of the statutory dose limit

The routine internal dosimetry monitoring programme identified an unexplained positive result for one worker.
Extensive investigation, including bioassay data analysis and a detailed review of working circumstances and facility state, concluded that the worker received an internal (effective) dose of 23.00 mSv in 2020 by inhalation of resuspended surface contamination of recently separated material.
In the United Kingdom the statutory annual (effective) dose limit is 20.00 mSv.
Additional testing found no other workers to have been affected and there was no radioactive release.

Location: Sellafield Ltd. UK
Event date: Wed, 25-05-2022
Nuclear event report
Legenda & explanation