What unit measures the absorbed dose of radiation?

The unit that measures the absorbed dose of radiation is the Gray (Gy). This unit quantifies the amount of radiation energy absorbed per unit mass of tissue. One Gray is defined as the absorption of one joule of radiation energy by one kilogram of matter. This measurement is crucial in radiation therapy and radiological assessments, as it provides a clear indication of the dose of radiation that has been delivered to a specific area, allowing for proper dosage calculations in medical treatments and safety evaluations.

In contrast, the Roentgen (R) is a unit that measures exposure to ionizing radiation in air, specifically reflecting the amount of radiation required to produce a certain amount of ionization in air. The Sievert (Sv) measures biological effects of radiation, taking into account the type of radiation and its impact on human tissue, rather than just the absorbed dose. The milliliter (mL) is a unit of measurement for volume and is not applicable in the context of radiation measurement. Thus, the Gray is the appropriate unit for assessing the absorbed dose of radiation.