Commentaries: Art. 52

For purposes of monitoring, licence holders shall classify the occupationally exposed persons into categories A and B in accordance with paragraphs 2–4.
Category A comprises persons who: a. may accumulate the following doses per calendar year in the course of their work: 1. an effective dose greater than 6 mSv, 2. an equivalent dose for the lens of the eye greater than 15 mSv, or 3. an equivalent dose for the skin, hands or feet greater than 150 mSv; b. as a result of radon exposure at the workplace receive an effective dose greater than 10 mSv per calendar year; or c. work as internal personnel at a nuclear installation.
Category B comprises all occupationally exposed persons not belonging to category A.
Persons engaged in activities where the risk of accumulating doses as specified in paragraph 2 letter a is negligible shall be assigned to category B for the performance of these activities. This includes in particular activities:
1. involving the operation of diagnostic X-ray systems in medical, dental and veterinary practices, except in the high-dose range;
2. as occupationally exposed aircrew.
If applicants or licence holders demonstrate that an activity does not fulfil any of the conditions specified in paragraph 2, they may request the supervisory authority to assign the persons performing this activity to category B.