American Registry of Radiologic Technologists (ARRT) Practice Exam

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Prepare for the American Registry of Radiologic Technologists Test with engaging quizzes and detailed explanations. Boost your test readiness with multiple-choice questions designed to enhance your knowledge and confidence.

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Which unit of measurement quantifies ionization in the air?

Rem
Roentgen
RAD
Gray

The correct answer is: Roentgen

The Roentgen is the unit of measurement that specifically quantifies ionization in the air. It measures the amount of ionization produced by gamma or X-ray radiation in a given volume of air under specified conditions. The definition of a Roentgen is based on the capability of radiation to produce ions (charged particles) in air, which directly relates to the exposure from X-ray and gamma radiation. This quantification is crucial in fields such as radiology and radiation protection, as it helps professionals understand the levels of radiation exposure and assess potential associated risks. While other units like RAD and Gray measure absorbed dose in different media, and REM is used for measuring the biological effect of radiation, they do not specifically relate to the measurement of ionization in air.