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Nakata, Kotaro*; Hasegawa, Takuma*; Solomon, D. K.*; Miyakawa, Kazuya; Tomioka, Yuichi*; Ota, Tomoko*; Matsumoto, Takuya*; Hama, Katsuhiro; Iwatsuki, Teruki; Ono, Masahiko*; et al.
Applied Geochemistry, 104, p.60 - 70, 2019/05
Times Cited Count:8 Percentile:35.73(Geochemistry & Geophysics)no abstracts in English
Hasegawa, Takuma*; Nakata, Kotaro*; Tomioka, Yuichi*; Goto, Kazuyuki*; Kashiwaya, Koki*; Hama, Katsuhiro; Iwatsuki, Teruki; Kunimaru, Takanori*; Takeda, Masaki
Geochimica et Cosmochimica Acta, 192, p.166 - 185, 2016/11
Times Cited Count:10 Percentile:34.66(Geochemistry & Geophysics)Groundwater dating was performed simultaneously by the He and
C methods in granite of the Tono area in central Japan. Groundwater was sampled at 30 packed-off sections of six 1000-m boreholes.
He concentrations increased and
C concentrations decreased along a groundwater flow path on a topographic gradient.
He ages were calculated by using the in situ
He production rate derived from the porosity, density, and U and Th content of the rock, neglecting external flux. The linear relation between the
He ages and the noncorrected
C ages, except in the discharge area. Simultaneous measurements make it feasible to estimate the accumulation rate of
He and initial dilution of
C, which cannot be done with a single method. Cross-checking groundwater dating has the potential to provide more reliable groundwater ages.
Tanaka, Yasuharu*; Hama, Katsuhiro
no journal, ,
CRIEPI and JAEA have been carried out collaborative study. Two items have proposed for this study. One is development of groundwater dating methodology, the other is development of mass transport evaluation methodology. In this report, the study item and result are introduced.