228Ra/226Ra activity ratio in groundwater around Mount Fuji, Japan
1 Research Reactor Institute, Kyoto University - Japan
2 Civil Engineering Laboratory, Central Research Institute of Electric Power Industry - Chiba, Japan
3 Office of Biospheric Assessment for Waste Disposal, National Institute of Radiological Sciences - Chiba, Japan
4 School of Science and Technology, Meiji University - Japan
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We estimated the groundwater age from 228Ra/226Ra ratios in young groundwater and relevant rocks in the volcanic area of the Kakitagawa River around Mount Fuji, Japan, and compared our results with those from 3H/3He age determination. The groundwater residence time estimated from the 228Ra/226Ra activity ratio in groundwater and relevant rocks agreed well with the 3H/3He age, suggesting that the 228Ra/226Ra ratio of groundwater can be used to estimate residence time of young groundwater in volcanic areas.
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