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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 ...
What does the dosimeter do? A radiation dosimeter measures the amount of high energy ionizing radiation a person has been exposed to during the wear period. These radiations include gamma radiation, x-radiation and high-energy beta radiation (such as P-32).