Diffusion 07
Diffusion 07 : The movement of radionuclides relative to the medium in which they are distributed, under the influence of a concentration gradient. Usually used for the movement of airborne radionuclides (e.g. from discharges or resulting from an accident) relative to the air, and for movement of dissolved radionuclides (e.g. in groundwater or surface water, from migration following waste disposal, or in surface water from discharges) relative to the water. See: also advection, where the radionuclide does not move relative to the carrying medium, but moves with it, and dispersion
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