American Registry of Radiologic Technologists (ARRT) Practice Exam

The acronym RAD stands for "Radiation Absorbed Dose," which is a unit used to measure the amount of radiation energy absorbed by an object, including human tissue. It quantifies the energy deposited by ionizing radiation in a given mass of material, allowing for assessments of the biological effects of radiation exposure. Understanding this measurement is essential for professionals in the field of radiology, as it relates directly to the potential risks and health effects associated with radiation exposure during medical imaging procedures.

The other options do not represent established terms or units in radiation measurement. "Radiation assessment dose" and "Radiation application density" lack recognition in the context of radiation safety and measurement. "Radiation active diffusion" is also not a term used in radiation dosimetry or exposure assessment. Thus, “Radiation Absorbed Dose” is the only correct and relevant definition, reflecting the standard unit of radiation measurement used by professionals in the field.