A radiation worker in a diagnostic imaging department is exposed to ionizing radiation. According to ICRP recommendations, what is the maximum permissible annual effective dose limit for occupational exposure?
- A 1 mSv per year
- B 20 mSv per year averaged over 5 years ✓
- C 50 mSv in a single year
- D 100 mSv in a single year
Correct answer: B. 20 mSv per year averaged over 5 years
Explanation
The ICRP recommends an occupational effective dose limit of 20 mSv per year averaged over 5 years (100 mSv total), with no single year exceeding 50 mSv. Option A (1 mSv) is the public limit. Option C (50 mSv) is the single-year maximum, not the standard annual limit. Option D is incorrect. The standard answer for annual occupational limit is 20 mSv averaged over 5 years.
Reference: Park's Textbook of Preventive and Social Medicine, 26th ed.
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