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硬組織を指標とした福島第一原発事故後の野生動物への$$^{90}$$Srと$$^{137}$$Csの取り込みの研究

Study on the uptake of $$^{90}$$Sr and $$^{137}$$Cs into wild animals after the Fukushima Daiichi Nuclear Power Plant accident using hard tissue as an indicator

小荒井 一真   

Koarai, Kazuma

歯や骨は硬組織と呼ばれ、形成時期のみに組織の基質が沈着し、形成後には組織が入れ替わらないという特徴をもつ。この特徴を活用することで、ウシの歯の$$^{90}$$Sr測定から1F事故による環境中の$$^{90}$$Srの汚染の変化があったことを明らかにした。講演では$$^{90}$$Sr, $$^{137}$$Csの環境中から野生動物へ移行する際の元素としての動態、ICP-MSを用いた硬組織用の分析法開発についても紹介する。

Ca-based tissues, such as teeth and bones, are called hard tissues. Sr is incorporated into the tooth during calcification. Once incorporated, it remains until the tooth falls out. Therefore, $$^{90}$$Sr in teeth recorded $$^{90}$$Sr contamination by the 1F accident in the environment during the formation period. The lecture will also introduce the dynamics of $$^{90}$$Sr and $$^{137}$$Cs as elements during their transfer from the environment to wild animals, and the development of analytical methods for hard tissues using ICP-MS.

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