According to ICRP recommendations, what is the annual effective dose limit for radiation workers (occupationally exposed individuals) in a 5-year average?

• A 1 mSv/year
• B 50 mSv/year with no 5-year average limit
• C 100 mSv/year for designated radiation workers
• D 20 mSv/year (averaged over 5 years, not exceeding 50 mSv in any single year) ✓

Explanation

ICRP Publication 103 recommends an effective dose limit for occupationally exposed workers of 20 mSv per year averaged over a defined 5-year period, with no single year exceeding 50 mSv. The public dose limit is 1 mSv/year. This is based on the linear no-threshold (LNT) model and ALARA (As Low As Reasonably Achievable) principle. These limits apply to stochastic risks (cancer, hereditary effects) and exclude medical exposures as a patient.

Reference: Grainger & Allison's Diagnostic Radiology, 7th ed.

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