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Boron isotopic ratios of some hot spring waters in the Kusatsu-Shirane area, Japan.

1987; The Geochemical Society of Japan; Volume: 21; Issue: 3 Linguagem: Inglês

10.2343/geochemj.21.133

1880-5973

Hidetake Kakihana, Tomoko Ossaka, Takao Oi, Masaaki Musashi, Makoto Okamoto, Masao Nomura,

Radioactivity and Radon Measurements

Boron isotopic ratios 11B/10B of five hot spring waters from the Kusatsu-shirane area, Japan have been measured mass spectrometrically. Their 11B/10B values are the same within experimental errors and the average value is 4.087. This suggests that the Kusatsu-shirane area belongs to the group of regions that show higher 11B/10B ratios. The secular change in the 11B/10B ratio has also been examined for one of the hot springs (Kusatsu-yubatake) and it is found that the ratio has been invariant (average of five measurements = 4.086) for the past twenty years.