A hospital radiation safety officer records staff occupational exposure in millisieverts. The sievert is the SI unit of:
- A Absorbed dose
- B Radioactive activity
- C Equivalent dose and effective dose ✓
- D Exposure measured in air
Correct answer: C. Equivalent dose and effective dose
Explanation
The sievent quantifies equivalent dose and effective dose, obtained by multiplying the absorbed dose in grays by radiation and tissue weighting factors, so it reflects biological harm rather than energy deposition alone. Absorbed dose is measured in gray, activity in becquerel, and exposure in the legacy unit roentgen. Confusing gray with sievert is the classic examination trap here.
Reference: Park's Textbook of Preventive and Social Medicine, 27th ed.
High-yield for: NEET PGINI-CETNExTFMGEUSMLEPLABMRCP
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