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Report No.

Groundwater dating conducted in Mizunami Underground Research Laboratory

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

Groundwater dating was conducted to Mizunami Underground Research Laboratory (MIU). $$^{14}$$C age and $$^{4}$$He age were estimated about 20,000 years around MIU. The estimation of noble gas temperature is also conducted. The estimated recharge temperature is around 6$$^{circ}$$C. This temperature is about 9$$^{circ}$$C cooler than present annual average temperature, which agree with estimation of modern analog method conducted near MIU.



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