飽和砂層内における放射性核種の挙動に関する研究(I) : 底質砂層内におけるイオンの拡散係数について

概要

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Recently, the pollution of water and soil due to industrial or radioactive wastes has been discussed, and it becomes important to forecast the behavior of pollutants in environmental hydro-system, such as substratum layer near the coast of nuclear power plant site.The degree of mobility of radionuclides can be represented by the apparent diffusion coefficients in a bottom layer.So, these work presented a mathematical model with non-steady boundary condition which could determine this coefficients, and examined the validity of this model by laboratory experiments, where many long-lived radionuclides diffused into a sandy sediment.The values of apparent diffusion coefficient were approximately obtained as follows,(3-4)X10-7cm2/sec for Sr, (1-2)X10-7cm2/sec for Mn and (3-8)X10-8cm2/sec for Cd, Co and Zn.The theoretical models for Ru, Ce, Hg and Zr were not suited for description of their behavior owing to the complex sorption model.
日本保健物理学会の論文