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Report No.

Study of groundwater residence time in Mizunami Underground Research Laboratory

Hasegawa, Takuma*; Nakata, Kotaro*; Tomioka, Yuichi*; Ota, Tomoko*; Hama, Katsuhiro ; Iwatsuki, Teruki  ; Kato, Toshihiro*; Hayashida, Kazuki

Groundwater dating using $$^{14}$$C, $$^{4}$$He, noble gas method was conducted in Mizunami Underground Research laboratory. The availability of degassing method for $$^{14}$$, flux estimation method for He were examined. It was identified that the groundwater have been derived in glacial age. The integration of distinct dating method is available to estimate precise age of groundwater.



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