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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 ...
Dose Quantaties: Absorbed dose, energy deposited in a kilogram of a substance by radiation. Equivalent dose, absorbed dose weighted for the degree of the effect of different radiations (radiation weighting factor wr). Effective dose, equivalent dose weighted for susceptibility to effect of different tissues (tissue weighting factor wt).