花崗岩および凝灰岩間隙水中のイオンの拡散係数の測定

概要

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Diffusion of iodide anion in rock pore water was studied in order to evaluated diffusivity of "non-sorbing" radionuclides in rockmatrix. Effective diffusion coefficients of iodide anion were measured, using a simple diffusion cell, on granite and tuff samples, which were selected as typical homogeneous rocks having different porosities. Effective diffusion coefficients of iodide anion were about 2 X 10^(-12) m^2/s for granite samples and about 7 X 10^(-11) m^2/s for tuff samples. The porosities, determined by a water saturation method, of the granite and the tuff samples were about O.8% and 25%, respectively. The effective diffusion coefficient of iodide anion was much larger in the tuff sample than in the granite sample. This fact can be understood by the difference in their porosities.
一般社団法人日本応用地質学会の論文
1989-06-25