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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 limits for optical radiation are expressed using the following quantities and units (Table 1). Irradiance, E (W mj2), and radiant exposure, H (J mj2), are used in describing the concepts of surface exposure dose rate and surface exposure dose from direct exposure to laser radiation. Radiance, L (W mj2 srj1)is