Exposure pathway

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Term Exposure pathway
Description The exposure pathway is the physical course (e.g. through the air, or through drinking water) that a chemical takes from its emission by the facility to the exposed individual and is related to the type of release.
Definition Exposure pathway

The physical course a chemical or pollutant takes from its source to the organism exposed. The course an agent takes from the source to the target. The path from sources of pollutants via, soil, water, or food to man and other species or settings. The route a substance takes from its source (where it began) to its end point (where it ends), and how people can come into contact with (or get exposed to) it. An exposure pathway has five parts: a source of contamination (such as an abandoned business); an environmental media and transport mechanism (such as movement through groundwater); a point of exposure (such as a private well); a route of exposure (eating, drinking, breathing, or touching), and a receptor population (people potentially or actually exposed). When all five parts are present, the exposure pathway is termed a completed exposure pathway. RAGS Volume I, Part A, Chapter 6 defines exposure pathway as "the course a chemical or physical agent takes from a source to an exposed organism. An exposure pathway describes a unique mechanism by which an individual or population is exposed to chemicals or physical agents at or originating from a site. Each exposure pathway includes a source or release from a source, an exposure point, and an exposure route. If the exposure point differs from the source, a transport/exposure medium (e.g. air) or media (in cases of intermedia transfer) also is included.

References http://www.epa.gov/OCEPAterms/eterms.html

http://www.atsdr.cdc.gov/glossary.html#G-D- http://www.epa.gov/oswer/riskassessment/glossary.htm#e http://www.epa.gov/opptintr/rsei/tools/glossary.html  

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