包气带黄土介质中核素迁移的双峰机理研究  

A research on double peak phenomena of nuclide migration in loess media of unsaturated zone

作　　者：钱天伟[1] 郭志明[1] 郭谦[1] 

机构地区：[1]中国辐射防护研究院,太原030006

出　　处：《核技术》2002年第4期261-266,共6页Nuclear Techniques

摘　　要：从理论上对引起核素在包气带迁移实验中的双峰现象机制进行了分析和计算 ,计算结果说明离子交换作用不会导致双峰现象 ;分别以稳定核素Sr、Nd、Ce为示踪剂 ,再次进行了野外现场包气带实验 ,最终结果表明源项介质同黄土介质的分配系数Kd 的差异可能是导致出现双峰现象的真正原因。In order to study the mechanism of double peaks at nuclide migration in unsaturated zone, theoretical analysis and calculations were carried out. The results indicated that ion exchange processes did not cause the double peak phenomena. The field experiments in unsaturated zone were also conducted by using the stable isotope tracers of Sr, Nd and Ce. The results verified such doubles peaks might be caused by the difference of K d between the source and loess layers.

关 键 词：包气带 黄土介质 双峰机理 双峰现象 核素迁移 核废物 处置 安全评价 

分 类 号：TL942.1[核科学技术—辐射防护及环境保护]