American Registry of Radiologic Technologists (ARRT) Practice Exam

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The unit used to measure absorbed dose is?

REM
Röntgen
Rad
Sievert

The correct answer is: Rad

The measurement of absorbed dose refers specifically to the amount of energy deposited by ionizing radiation in a given mass of tissue. The unit for absorbed dose is the rad (radiation absorbed dose). One rad is defined as the absorption of 100 ergs of energy per gram of matter. This unit is crucial in assessing radiation exposure and its potential biological effects on living tissue. In the context of radiation measurements, while REM (roentgen equivalent man) and Sievert are used for measuring equivalent dose and effective dose (which accounts for the type of radiation and its biological effects), they are not the direct measure of absorbed dose. Röntgen, on the other hand, measures exposure in air and is related to the ionization produced by X-rays and gamma rays but does not directly correlate to the energy absorbed by tissues. Therefore, the rad stands out as the correct answer for absorbed dose measurement.