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Guideline for permanent activity in the air for occupationally exposed persons (CA). Staying in air with an activity concentration CA during 40 hours per week and 50 weeks per year results in an effective follow-up dose of 20 mSv.

For inhalation the following applies:

CA [Bq/m3] = 0,02 Sv / (einh. 2400 m3/a).


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