富山における陸水中のトリチウムの分布と挙動

概要

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Tritium content in precipitation and river water samples from the Toyama district were measured. To test the reproducibility of the measurement, the tritium content in tap water was repeatedly measured. Excluding one set of data which was probably lower because of the accidental condensation of atmospheric moisture on the water sample during electrolysis, the results obtained ranged from 25.6 to 27.4 T.U. In the Toyama district, the tritium content in precipitation shows its maximum value in spring, and a rather constant value (～12T.U.) during summer to winter. In some other districts in Japan, however, it was observed that winter precipitation from the air mass generated within the Asia continent has a maximum tritium content. Tritium content of the seven large rivers in the Toyama district ranged from 19.6 to 27.0 T.U. in April and June, 1980. The tritium content of the river water samples were about two times higher than the annual tritium content average in precipitation, and did not reveal any seasonal variations. These facts suggest that the rivers are recharged from aquifers in which past precipitation is well mixed.
富山大学の論文