金沢市および六甲山周辺等の地下水のトリチウム濃度 [in Japanese] Tritium concentrations of the ground water in Kanazawa City and around the Rokko mountains [in Japanese]
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The depth profile of tritium concentration in underground water was studied in the Kodatsuno area of Kanazawa City together with the areal distribution of tritium in ground water around the Rokko mountains in Hyogo. Tritium concentrations of ground water were also measured at various points in Japan. The tritium concentration in Kanazawa City appears to have increased in the depth of 50-90 meters owing to traces of bomb tritium. Below 135 meters in depth, it decreases enough to enable the water to be used as background water for low level tritium measurement. Our measurements for spring water in Arima and river water from the Rokko mountains show a fairly rapid decrease during these ten years when compared with the previously published data. Among water samples collected at various points in Japan, some underground water has a concentration of tritium about twice as high as in recent rain water. It can be ascribed to a contribution of rain water of about 10-20 years ago, which had a high tritium content. The range of tritium in mineral and hot spring waters through medium to extremely low concentrations may be attributed to the various degree of mixing of deep water with different kinds of underground water in shallow layers. Several water samples are examined as a useful background water to determine tritium accurately by the liquid scintillation method.
Chikyukagaku 20(1), 1-12, 1986
The Geochemical Society of Japan