Organ equivalent dose exceeding statuary annual limits

Print View Posted on: 09 February 2021

Event Date: 31 July 2020 Event Type: Radioisotope Processing/Handling Facility
Event Location: Germany, Company for measuring techniques, Bavaria INES Rating: 2 (Final)

In July 2020 an incident happened at a company in Bavaria, Germany. According to the company's radiation protection supervisor, the X-ray sources of the thickness measuring system to be checked by a worker of a measurement technology company can be con-sidered as the cause of the exposure. It seems most likely that the worker briefly ex-posed his hand with the ring dosimeter to the direct beam during adjustment work on the beam collimator. During the evaluation of a ring dosimeter for this worker, a dose value of 768 mSv was determined. It can be assumed that this is associated with a corresponding organ equivalent dose of the hand (limit value 500 mSv per calendar year). Another dosimeter (OSL) measured a dose of 0.3 mSv (whole body). An electronic do-simeter showed a dose value of 38 µSv. The dose limit (whole body) for radiation workers is 20 mSv per calendar year.

INES Rating: 2 - Incident (Final) as per 21 January 2021
Release beyond authorized limits? No
Overexposure of a member of the public? No
Overexposure of a worker? Yes

Contamination spread within the facility? No
Damage to radiological barriers (incl. fuel damage) within the facility? No

Degradation of Defence In-Depth No

Person injured physically or casualty? No
Is there a continuing problem? No

Michael Maqua
Gesellschaft für Anlagen und Reaktorsicherheit
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