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The migration of  90 Sr in a weak loess aquifer was investigated in-situ in an Underground Research Facility. Quartz containing  90 Sr,  3 H and other nuclides was introduced into the aquifer with a stainless steel pipe. The local water flow field in the aquifer was monitored using a 3-dimensional sampling system. The contaminated area of the aquifer was marked out wholly with the help of a pre-installed stainless steel frame and cut into small pieces (samples) 3-dimensionally, and analyzed. The result of the -3year experiment indicated that  90 Sr had normal concentration distributions in  Y  and  Z  directions. The migration rate of the mass center for  90 Sr in  X  direction was calculated as 3.5×10 -5 cm/d, the distribution coefficient for  90 Sr in the aquifer was calculated as 7.4×10 2 ml/g and the diffusion coefficient for  90 Sr in the aquifer in  X  direction was calculated as 1.3×10 -11 m 2 /s.

Field study of the migration of 90 Sr in a weak loess aquifer