NANTeL Radiation Worker Training Practice Test

The unit rem is used to express which of the following?

The energy absorbed per kilogram The dose to a specific organ The rate of decay Measured radiation exposure in people

Correct Answer:

Measured radiation exposure in people

Explanation:

Rem expresses the dose equivalent a person receives from radiation, factoring in the different biological effects of various radiations. It’s not a measure of energy deposited per kilogram (that’s absorbed dose, in gray), nor a measure of how fast the material decays (that’s activity, in becquerels), and it isn’t simply a specific organ dose without considering tissue sensitivity. Historically, rem, short for roentgen equivalent man, was used to express how much radiation exposure a person would effectively experience, with sievert now serving as the modern equivalent unit.

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