Absorbed Dose 01
Absorbed Dose 01 : Radiation and Radiological Disasters. (a) See: Internal Dose. [REAP, 1995: Residential Exposure Assessment Project][USEPA, 1992: GL for Exposure Assessment]; (b-1) The energy imparted to a unit mass of matter by ionizing radiation. The unit of absorbed dose is the rad. One rad equals 100 ergs per gram. (b-2) The amount of a substance absorbed into the body, usually per unit of time. The most common unit of dose is mg per kg body weight per day (mg/kg_day). [SRA, 1999: Glossary of Risk Analysis Terms, attributed to Stephen L. Brown]; (c) Energy absorbed by matter from ionizing radiation per unit mass of irradiated material at the place of interest in that material. The absorbed dose is expressed in units of rad (or gray) (1 rad = 0.01 gray). [USDOE, 1998: Radiological Control Manual]; (d) The energy imparted to a unit mass of matter by ionizing radiation. The unit of absorbed dose is the rad or gray. One rad equals 100 ergs per gram. The amount of a substance absorbed into the body, usually per unit of time. The most common unit of dose is mg per kg body weight per day (mg/kg_day). [USDOE, 2000: RAIS Glossary]; (e) The amount of a substance penetrating across an absorption barrier (the exchange boundaries) of an organism, via either physical or biological processes. Sometimes called internal dose. [USEPA, 1992a: Dermal Exposure Assessment]; (f) In exposure assessment, the amount of a substance that penetrates an exposed organism's absorption barriers (e.g.,, skin, lung tissue, gastrointestinal tract) through physical or biological processes. The term is synonymous with internal dose. [USEPA, 1997a: EPA Terms of Environment]; (g) The amount of pesticide entering systemic circulation after crossing a specific absorption barrier (e.g., the exchange boundary of the skin, lung, or digestive tract); normally expressed as mass per unit body weight per unit time (e.g., mg/kg/day). Internal dose is a more general term denoting the amount absorbed with respect to specific absorption barriers or exchange boundaries [USEPA, 1998: Postapp. Exposure Test GL., attributed to USEPA, 1992]; (h) Dose resulting from the agent crossing the contact boundary and diffusing through a resisting boundary layer [Zartarian, et al., 1997: Quant. Def. of Exp. & Related Concepts] [Cf. Internal Dose]
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