According to the International Commission on Radiological Protection, the annual effective dose limit for MEMBERS OF THE PUBLIC from man-made sources of ionizing radiation (excluding medical and background exposure) is:

• A 100 mSv per year
• B 50 mSv per year
• C 20 mSv per year
• D 1 mSv per year ✓

Explanation

ICRP recommends a public dose limit of 1 mSv per year, roughly one tenth of the occupational limit of 20 mSv per year averaged over five years with no single year exceeding 50 mSv. Natural background radiation averages about 2.4 mSv globally per year but is excluded because it cannot be regulated. Options C and B are occupational figures, the commonest confusion in this item.

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

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