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The unit ‘rad’ is used to express the measurement of which of the following?
- the ion-producing power of a gamma-ray beam in a material
- the amount of energy deposited by radiation in a material
- the biological impact produced by radiation
- the disintegration rate of a radioactive source
Correct answer: the amount of energy deposited by radiation in a material
Solution
The rad (radiation absorbed dose) measures the amount of energy deposited by radiation per unit mass of material (1 rad = 0.01 J/kg). Biological impact is measured by the rem/sievert, and disintegration rate by the becquerel/curie.
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