Experimental simulation of ~(238)U and ~(239)Pu migration speed in shale and soil medium

In this paper,the dynamic migration experimental research work was carried out for 238U and 239Pu nuclides in shale and soil geological medium from a low level radioactive waste repository site in southwest China.Diffusion coefficient DL and degree of dispersion(αL) of tritium were obtained through the tritium penetration experiment.In shale,DL value is 0.027 cm2 · min-1and αL is 0.324 cm.In soil,DL value is 0.064 cm2 · min-1 and αL is 0.895 cm.By the leaching experiment,the migration speed of 238U in shale and soil medium were 6.1—8.1 cm · a-1 and 7.3 —8.5 cm · a-1,and the migration speed of 239Pu in shale and soil medium were 4.1—6.1 cm · a-1 and 3.7 — 4.9 cm · a-1 respectively.