Studies on Environmental Contamination by Uranium 1. Environmental Survey of Uranium in Kamisaibara Village, Okayama Prefecture

概要

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In order to investigate situations of uranium contamination in Kamisaibara village where uranium mines are being developed, measurements have been made on the amounts of uranium flow in the streams since 1963, and uranium contents in soil and in farm produce since 1965 by counting system and fluorimetric method. As a result, it has been found that the mean amounts of uranium flow in the streams in each year is proved to be higher at the sampling spots where drainages of gallaries and the pilot refinery were disposed, and the amounts were between 5.39 and 204.5 mg per minute. At the spots about 2,000 m lower reaches from these spots, the detectable amounts were 0 to about 30% as compared with those amounts in each year. In general, the spots where the element can be detected gradually move downward year by year. The uranium contents in soil sampled in the village were 1.9 to 4.0μg per g of air-dried soil. Uranium was detected in all vegetables sampled in the village, and the contents were between 0.1 and 0.67μg per g of ash, while it could not be detected in all the vegetables sampled in Okayama City. On uranium contents in soils and vegetables, however, no remarkable variation with time could be observed.
日本放射線影響学会の論文