摘要
通过对现场示踪试验和实验室模拟实验结果的分析和拟合发现 ,85Sr在非饱和黄土介质中的延迟系数Rd 并非常数 ,它随土壤含水量θ的增加而增大 ;而且 ,Rd 随θ的变化趋势也与常用公式计算的结果相反。这表明 :对于非饱和黄土 ,由实验室测量的分配系数kd 直接导出用于现场评价的Rd 是不可行的 ,公式的应用范围以及kd
It is found that the retardation coefficient, Rd, of 85Sr in unsaturated loess medium is not constant and increases with water content, θ, according to analyzing and fitting to the results obtained from the field tracer migration and laboratory simulation tests. The change tendency of retardation coefficient with water content in loess is in contrary to the results calculated from conventional formula. It is shown that the coefficient Rd which is derived directly from the distribution coefficient, Kd, measured by batch method in laboratory can't be used for assessing the safety of a specific site. Moreover, the application range of conventional formula and the method of measuring kd have to be researched further.
出处
《原子能科学技术》
EI
CAS
CSCD
2001年第4期320-324,共5页
Atomic Energy Science and Technology
