Home / Store / Journals / Electronic Articles / Nuclear Technology / Volume 123 / Number 1 / Pages 82-89
B. Peter McGrail
Nuclear Technology / Volume 123 / Number 1 / Pages 82-89
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Analytical solutions to the unsteady diffusion equation in spherical geometry are presented for uniform and composite porous media. In this case, a Neumann (prescribed flux) boundary condition is assumed as opposed to a Dirichlet (prescribed concentration) boundary condition used in previously published derivations. For radionuclides that have very high solubility under a given set of geochemical conditions, such as 99Tc and 79Se under oxidizing conditions, a prescribed flux boundary condition is more appropriate.
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