The SI unit of measurement for absorbed dose is?

The SI unit of measurement for absorbed dose is the gray. The gray quantifies the amount of radiation energy absorbed per unit mass of material, specifically one joule of radiation energy absorbed per kilogram of matter. This unit is crucial in the field of radiology and radiation safety because it provides a standardized measure for comparing the effectiveness of different types of radiation across various tissues and materials.

In contrast, the rad is a non-SI unit that was historically used to measure absorbed dose, but it has been largely replaced by the gray to align with the international system of units. The rem and sievert are both units that consider the biological effects of radiation, factoring in the quality and type of radiation, but they are used to measure dose equivalence and are not direct measures of absorbed dose like the gray.