放射性核素在页岩和黄土中的迁移研究

Study on Migration of Radionuclide in Shale and Loess Column

介绍了 8 5Sr和 1 34 Cs在页岩 ,85Sr、1 34 Cs和 6 0 Co在黄土中的迁移研究结果。在页岩中 85Sr、1 34 Cs的滞留因子分别为 80～ 1 0 2和 1 60 0 0 ,分配系数分别为 1 5～ 2 5 m L/ g和 41 85 m L/ g;85Sr、1 34 Cs和 6 0 Co在黄土中的滞留因子分别为 45 0～ 5 3 0、4.1× 1 0 4 ～ 4.6× 1 0 4 和 3 .2× 1 0 4 ～ 3 .6× 1 0 4 ,分配系数分别为 80～ 86m L/ g、7.3× 1 0 3～ 7.5× 1 0 3m L/ g和 5 .7× 1 0 3～ 5 .8× 1 0 3m L/ g。结果表明 ,页岩对 85Sr和 1 34 Cs有较强的吸附性 ,黄土对 85Sr、1 34 Cs和 6 0 Co的吸附性极强。

This paper describes the migration mechanism of 85 Sr and 134 Cs in shale medium and sorption mechanism of 85 Sr, 134 Cs and 60 Co in loessial soil medium using dynamic column experiment. Furthermore, to determine the hydrodynamical diffusion coefficient and retardation factor of radionuclides in shale and loess media, R d of 85 Sr and 134 Cs in shale are 80～102 and 16 000, K d are 15～25 mL/g and 4 185 mL/g,respectively. Pertinent data of 85 Sr, 134 Cs and 60 Co in loess soil are 450～530, 4.1×10 4～4.6×10 4, 3.2×10 4～3.6×10 4 for retardation factor and 80～86, 7.3×10 3～ 7.5 ×10 3,5.7×10 3～5.8×10 3 mL/g for sorption ratio,respectively. The results show that loess medium has a very strong adsorption onto 85 Sr, 134 Cs and 60 Co and that shale medium has less-than-above adsorption to 85 Sr and 134 Cs.