Laboratory simulation tests of radionuclide and stable element migration in loess aerated zone

摘要

According to the program of the cooperative project "Safety Assessment Methodology for shallow Land Disposal of Low Level Radioactive Wastes (1995-2001)" between CIRP and JAERI, laboroatory simulation tests for studying migration of radonuclides (~(237)Np,~(238)Pu and ~(90)Sr) and stable elements (Ce, Nd and Sr) in loess aerated zone have been conducted with soil coumns since 1997. THis paper describes tst method, placing emphasis on how to establihs and measure the stable unsaturated water flow, presents preliminary result of ~(237)Np migration. The tests are now being continued. Two test columns will be open-cut several months later, and others 2 years later to take soil samples and analyse concentrations of both radionuclides and stable elements.