マンガン化合物で被覆したアクリル繊維を利用する河川水中の^<228>Ra/^<226>Ra放射能比の測定(<特集>流れを利用する新しい分析技術)

概要

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Radium isotopes (^<228>Ra and ^<226>Ra) in river-water samples from Japan having low concentrations were attempted to be collected by a Mn-impregnated acrylic fiber. The method was aimed at the in-situ collection of Ra isotopes in large amounts of river water by making effective use of the flow of the river to observe the ^<228>Ra/^<226>Ra activity ratio. Measurements of the ^<228>Ra/^<226>Ra activity ratios were made by non-destructive γ-ray spectrometry. Although the collection efficiency of Ra isotopes by Mn-impregnated acrylic fiber was observed to be dependent on the water pH and temperature, the Ra isotopes in river water in an effective range of pH and temperature could be successfully collected. The ^<228>Ra/^<226>Ra activity ratios observed in several rivers of Japan by the present method were in the range of 1.1〜2.9, which is slightly higher than those observed in rivers of the continental area.
社団法人日本分析化学会の論文
2005-12-05