Regarding radiation safety, the annual occupational dose limit for radiation workers (effective dose) as per AERB regulations in India is:

• A 50 mSv/year with no averaging allowed
• B 100 mSv/year for diagnostic radiology staff
• C 1 mSv/year (same as for the general public)
• D 20 mSv/year averaged over 5 years, not exceeding 50 mSv in any single year ✓

Explanation

ICRP 2007 recommendations and India's AERB (Atomic Energy Regulatory Board) Safety Code specify that the occupational effective dose limit for radiation workers is 20 mSv per year averaged over any consecutive 5-year period (100 mSv total over 5 years), with no single year exceeding 50 mSv. This dose constraint model protects against both stochastic (carcinogenic) and deterministic effects. The general public limit is 1 mSv/year effective dose. For pregnant workers, abdominal dose to the foetus should not exceed 1 mSv for the declared term of pregnancy.

Reference: Park's Textbook of Preventive and Social Medicine, 27th ed.

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