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.

Language	:	Japanese
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Meeting title	:	日本地球惑星科学連合2018年大会(JpGU 2018)
Held date	:	2018/05
Location (city)	:	千葉
Location (country)	:	日本
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Keywords	:	地下水年代; 14C; ヘリウム温度計
Research Facility	:	超深地層研究所
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Article of JAEA R&D Review	:
Cooperating Institute	:	電力中央研究所

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Registration No. : BB20172039
JAEA Abstracts No. :
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