Non-destructive rapid determination of Radium-226 in soil using Radon-222 escape-to-production ratio.
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概要
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It is greatly desirable that 226Ra in the environmental materials is rapidly determined for an accidental release. Radium-226 can be rapidly determined by being coprecipitated with barium sulphate. But, this method requires complicated chemical treatments.We derived the formula for rapid determination of 226Ra in soil by gamma-ray spectrometry in consideration of 222Rn escape-to-production ratio of soil. Using this formula, 226Ra in soil could be determined within 2 days.Furthermore, 226Ra content in the river-bed soil (weathered granitic rock) around Ningyoh-Tohge was almost the same level of that in the granitic rock in Japan. And, 222Rn escape-to-production ratios and 226Ra contents of the paddy, upland and virgin soils around Ningyoh-Tohge, which are volcanic ash, were in agreement with those of other volcanic ash soils.
- 日本保健物理学会の論文
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- フランスの微弱放射能センター(Centredes Faibles Radioactivites)を訪問して