Which SI unit is used to express the equivalent dose of ionising radiation, taking into account the biological effectiveness of different types of radiation?

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

Explanation

The sievert measures equivalent and effective dose, obtained by multiplying the absorbed dose in grays by a radiation weighting factor, so it reflects biological harm. The gray measures absorbed energy per kilogram of tissue without weighting. Becquerel and curie measure radioactivity, that is, disintegrations per second, and have no relation to dose received by tissue.

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

High-yield for: NEET PGINI-CETNExTFMGEUSMLEPLABMRCP

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