A uranium mine worker undergoes periodic health surveillance for radon exposure. The unit used to quantify radiation dose received by body tissues in occupational health monitoring is:

• A Becquerel (Bq)
• B Gray (Gy)
• C Curie (Ci)
• D Sievert (Sv) ✓

Explanation

Sievert (Sv) is the SI unit of effective dose (absorbed dose weighted for radiation type and tissue sensitivity), which is the relevant measure for health risk and occupational exposure limits. Gray (Gy) measures absorbed dose (energy deposited per kilogram tissue) without accounting for biological effectiveness. Becquerel (Bq) measures radioactivity (disintegrations per second). Curie (Ci) is the older unit of radioactivity (1 Ci = 3.7 × 10¹⁰ Bq). For regulatory occupational limits (e.g., AERB: 20 mSv/year averaged over 5 years), Sievert is used.

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

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