Dose Membrane
Dose Membrane : A barrier which offers resistance to flow of the agent after it crosses a contact boundary [Zartarian, et al., 1997: Quant. Def. of Exp. & Related Concepts] Dose Rate: (a) Dose per unit time, for example in mg/day, sometimes also called dosage. Dose rates are often expressed on a per-unitbody- weight basis, yielding units such as mg/kg/day (mg/kg-day). They are also often expressed as averages over some time period, for example a lifetime. [USEPA, 1992: GL for Exposure Assessment] [USEPA, 1992a: Dermal Exposure Assessment] [REAP, 1995: Residential Exposure Assessment Project]; (b) In exposure assessment, dose per time unit (e.g., mg/day), sometimes also called dosage. [USEPA, 1997a: EPA Terms of Environment]; (c) The rate at which the agent passes through a unit area of the contact boundary [Zartarian, et al., 1997: Quant. Def. of Exp. & Related Concepts]
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