The SI unit of absorbed dose 'D' i.e. radiation effect is Gray and one Gray is equal to:
Correct answer: D. J / kg
- A. kJ / mol
- B. J / mol
- C. kg / J
- D. J / kg
Explanation
The absorbed dose is the amount of energy from ionizing radiation absorbed per unit mass of a material. The SI unit for absorbed dose is the Gray (Gy), which is defined as 1 joule of radiation energy absorbed per kilogram of matter. This is why the correct unit is J/kg. Option A (kJ/mol) and Option B (J/mol) relate to chemical energy, not absorbed radiation dose. Option C (kg/J) is not a standard unit for any energy-related measurement.
This question appeared on the UHS MDCAT 2010 paper, which you can sit online with every answer explained.
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