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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 ...
Exposure One way to measure the intensity of x-rays or gamma rays is to measure the amount of ionization they cause in air. The amount of ionization in air produced by the radiation is called the exposure.xposure One way to measure the intensity of x-rays or gamma rays is to measure the amount of ionization they cause in air. The amount of ionization in air produced by the radiation is called the exposure.