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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 ...
Radiation doses for cancer treatment are measured in a unit called a gray (Gy), which is a measure of the amount of radiation energy absorbed by 1 kilogram of human tissue. Different doses of radiation are needed to kill different types of cancer cells.