Concentration ratio
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The ratio of the activity concentration of a radionuclide within an organism (or one specific tissue of the organism) to that in the surrounding medium, such as air, sediment, soil or water.
(Adapted from ICRP Publication 114, 2009)
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from ICRP Publication 114, 2009
Activity concentration within an organism relative to that in its surrounding habitat (as represented by a particular media such as air, sediment, soil, or water).