The SI unit used to express the effective dose of ionising radiation, which accounts for the type of radiation and the sensitivity of exposed tissues, is:
- A Gray
- B Curie
- C Sievert ✓
- D Becquerel
Correct answer: C. Sievert
Explanation
The sievert (Sv) is the unit of equivalent and effective dose, obtained by weighting the absorbed dose by radiation quality factors and tissue weighting factors, thereby reflecting biological harm. The gray (Gy) measures absorbed energy per kilogram of tissue without any biological weighting. The curie and becquerel quantify radioactivity, that is disintegrations per second of a source, not the dose received by a person.
Reference: Park's Textbook of Preventive and Social Medicine, 27th ed.
High-yield for: NEET PGINI-CETNExTFMGEUSMLEPLABMRCP
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