環境土壤及び生薬中の^<137>Csの分布

概要

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Radioactivity of ^<137>Cs and ^<40>K was determined on commercially available products of Houttuynia Herb which were imported from China and Taiwan or processed in Japan, and of Houttuynia cordata harvested in 15 places in Japan and the surrounding soil. On Houttuynia Herb, the concentrations of ^<137>Cs and ^<40>K were LTD (less than detectable)-7.6 Bq/kg dry and 743-1964 Bq/kg dry, respectively, suggesting that the concentration of ^<137>Cs was less than 1% of that of ^<40>K. The domestic products were found to contain higher concentrations of ^<137>Cs and ^<40>K than the imported ones. The concentration of ^<137>Cs of Houttuynia cordata harvested in Japan ranged from 0.8 Bq/kg dry to 172 Bq/kg dry, while the concentration of ^<40>K was almost the same as that of the commercial products. The concentration ratio of ^<40>K in Houttuynia cordata to that in the soil was correlated with the moisture content and the ignition loss of the soil. However, the concentration ratio of ^<137>Cs did not show a very clear correlation. When 15 g of Houttuynia Herb or Houttuynia cordata was daily decocted and given for 1 year the former showed the committed dose equivalent of 0.02-0.5 μSv and the latter 0.06-12 μSv. Both of these values were less than 0.5% of the annual effective dose equivalent from the nature, 2.4 mSv.
公益社団法人日本薬学会の論文
1997-12-31