Exposure 59
Exposure 59 : The condition of being subject to the effects of or acquiring a dose of a potential stressor such as a hazardous chemical agent or ionizing radiation; also, the process by which an organism acquires a dose of a chemical such as mercury or a physical agent such as ionizing radiation. Exposure can be quantified as the amount of the agent available at various boundaries of the organism (e.g., skin, lungs, gut) and available for absorption. In the radiological context "exposure" refers to the state of being irradiated by ionizing radiation or the incidence of radiation on living or inanimate material. More specifically, radiation exposure is a dosimetric quantity for ionizing radiation, based on the ability of radiation to produce ionization in air. It is the time integral of the radiation intensity incident at a given position. Exposure is expressed in units of roentgens (R) or coulombs per kilogram (C/kg). Note: Although still encountered occasionally as a unit of exposure, the roentgen is no longer in favor; the coulomb per kilogram is the SI unit of exposure and is now generally accepted
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