Computed Tomography Technologist Practice Exam 2026 – All-in-One Guide for Exam Success!

The radiation absorbed dose (RAD) is a specific unit of measurement that quantifies the amount of energy that is absorbed per unit mass of a material, typically human tissue. This measurement is crucial in understanding how much radiation exposure a specific amount of matter, such as body tissue, has received, which directly relates to potential biological effects.

In practical terms, one RAD equates to the absorption of one joule of radiation energy by one kilogram of the material in question. This concept is fundamental in fields such as radiology and radiation therapy, as it helps professionals gauge the amount of energy being delivered to tissues, which aids in assessing potential damage or therapeutic efficacy.

The other options do not accurately reflect what RAD specifically measures. The total radiation exposure over time pertains more to the cumulative dosage rather than energy absorption per unit mass. The effectiveness of radiation therapy is measured by the response of the tumor or tissue to radiation, requiring a broader context of treatment parameters. The quality of emitted radiation relates to the type and energy of the radiation rather than the quantity absorbed by a mass. Thus, B correctly identifies the specific focus of the RAD measurement.