裂片核素在岩石中的迁移研究Ⅳ.核素~(75)Se在花岗岩中的吸附、扩散、渗透和数学模型

裂片核素在岩石中的迁移研究Ⅳ.核素~(75)Se在花岗岩中的吸附、扩散、渗透和数学模型

摘要

摘要: 在自行设计的吸附槽、扩散槽和渗透槽中分别做了核素￣（７５）Ｓｅ（以模拟裂片核素￣（７９）Ｓｅ）在整块花岗岩（取自北京周口店）中的吸附、扩散和渗透实验，测得了含￣（７５）Ｓｅ岩石平衡水在岩石中的孔隙流速、弥散系数和迟滞因子。根据核素在花岗岩中迁移过程的吸附、弥散和流动提出了数学模型，并用计算机求解得到核素￣（７５）Ｓｅ在花岗岩中随时空变化的分布函数。

Abstract: MIGRATION STUDIES OF FISSION PRODUCTS NUCLIDES IN ROCKS Ⅳ.SORPTION，DIFFUSION，PERMEABILITY AND A MODELEQUATIN OF MIGRATION OF NUCLIDE~(75)S_e IN GRANITEWEN RUIYUAN ;GAO HONGCHENG ;WANG XIANGYUN ;YOU TIEFENG（Department of Technical Physics，Peking University，Beijing，100871）ABSTRACT The migration behaviour of nuclide ~(75)Se，representing the long—lived fission product ~(79)Se，inBeijing granite is studied by means of sorption，diffusion and permeability measurement in a self-designed cells．The interstitial flow velocity，the longitudinal dispersion coefficient and the effec-tive interstice fraction are obtained．Based on the sorption，longitudinal dispersion and flow，adifferential equation describing the migration behaviour of nuclide in granite is suggested.Thedistribution function and numerical solution of nuclide ~(75)Se in granite are also given by using com-puter.Key words~(75)Se Interstitial flow velocity Longitudinal dispersion coefficient Effec-tive interstice fraction

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