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Dose: A general term used to refer to the effect on a material that is exposed to radiation. 1  Gray (Gy): The international system (SI) unit of radiation dose expressed in terms of absorbed energy per unit mass of tissue. 2  Sievert (Sv): A sievert is the standard international measurement of dose. 3  rad (R): The original unit developed for expressing ...
A. Radiation can be measured using sensitive detectors in a whole-body counter. These detectors can measure the gamma rays emitted by radioactive materials that are in or on the body. Different radioactive materials will give off gamma rays of different energies, which is one technique to identify the material.