山梨県内産野生きのこ類中の福島原発事故以外の影響による Cs-137 濃度の推定

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  • Estimation of the concentration of radio cesium 137 in the wild mushrooms from Yamanashi Prefecture not derived from Fukushima Daiichi Nuclear Power Plant Accident
  • ヤマナシ ケンナイサン ヤセイ キノコルイ チュウ ノ フクシマ ゲンパツ ジコ イガイ ノ エイキョウ ニ ヨル Cs-137 ノウド ノ スイテイ

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Concentrations of Cs-134 and Cs-137 in 205 wild mushroom samples collected in Yamanashi Prefecture from September 2011 to October 2013 were measured. In all of wild mushroom samples, the concentration of Cs-137 was higher than that of Cs-134; in some samples, Cs-137 was detected while no Cs-134 was detected. Even when the concentrations of Cs-134 and Cs-137 were compared in consideration of their half-lives on the assumption that these radioactive cesium elements were brought due to the Fukushima Daiichi Nuclear Power Plant (NPP) accident, the concentration of Cs-137 was still significantly higher than that of Cs- 134. As the amounts of Cs-134 and Cs-137 released from the Fukushima Daiichi NPP were almost equivalent, the finding indicates that the collected wild mushrooms contained Cs-137 not derived from the Fukushima Daiichi NPP accident. In fact, the maximum concentration of Cs-137 not derived from the NPP accident was more than 200 Bq/kg in a sample.

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