Retardation characters of 3H and Br- migration in saturated loess
饱和黄土中3H和Br-迁移的延迟特征

Tests of radionuclide migration in saturated loess soil showed that Br~- migrated faster than ()~3H, this phenomenon has significant implications in the study of radionuclide migration, but has not been determined by numerical models. In this paper we proposed a new method to determine the breakthrough curves of ()~3H and Br~- by obtaining the flow velocity from the tests. The results showed that the migration of both ()~3H and Br~- are retarded in saturated loess, and retardation factors of ()~3H range from 1.95 to 2.05, and Br~- from 1.60 to 1.90, respectively. Comparison of the common method and the proposed method showed that the former gives a larger error for the identification of groundwater velocity. In addition, sensitivity analysis of retardation factor indicated that retardation factor has important influence on ()~3H and Br~- migration in saturated loess soil.