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Report No.

Estimation of groundwater replacement by shallow water around deep underground facility based on $$^{3}$$H and CFCs concentrations

Iwatsuki, Teruki; Omori, Kazuaki; Hagiwara, Hiroki; Hasegawa, Takuma*; Nakata, Kotaro*

Appricability of tritium and CFCs as an tracer of shallow water infiltration into deep was evaluated at Mizunami underground reserach laboratory. The observation results show that the infiltration of shallow water increases with time. Especially CFCs is avairable tracer for groundwater with the residence time of several tens years.



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