放射性Cs,Sr在土壤中迁移的研究

Experimental Study on Cs and Sr Transport in Soil Medium

研究了铯、锶在砂土介质中的分配系数Ｋｄ和滞留因子Ｒｄ。静态试验结果表明：溶液中核素浓度较低时，铯、锶的分配系数Ｋｄ基本保持不变；核素浓度较高时，分配系数Ｋｄ随浓度增加而减小； Ｋｄ值还随ｐＨ升高而变大，随溶液中其它阳离子浓度增加而减小。动态模拟试验表明：铯的迁移速度小于锶的迁移速度。虽然动态试验与静态试验的分配系数有一定差异，但其变化规律是一致的。

The paper studied adsorption distribution coefficient Kd and retardation factor R, of Cs and Sr in sandy soil medium. The results of static test showed that in the case of low concentration of nuclides, Kd value of Cs and Sr is basically constant, while in the case of high concentration, Kd value decrease with the increase of concentration. Kd increases with the increase of pH and declines with the increase of content of other positive ions. Dynamic test showed that migration speed of Cs is smaller than the that of Sr. The paper points out that the Kd value in static test is different from Kd in dynamic test, but both of them has identical change tendency.