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放射能は微生物では消せません via 日経トレンディネット

 東日本大震災に伴う東京電力・福島第一原子力発電所の事故が起きてから、早くも3年近くが経とうとしている。1号機のカバーは完成し、4号機燃料プール 内の使用済み核燃料の取り出しは始まったが、今なお先が見えない印象だ。ストロンチウム90を含む高濃度の汚染が地下水から検出されてもいる。忘れてし まっても構わないと言える状況では決してない。

その一方で、今になっても被災地を中心に怪しい対放射能グッズを売り込む動きが後を絶たないようだ。今回はそのうちの一つ、「放射能を消すことができる有用微生物」を取り上げてみよう。

結論を先に書くと、微生物で放射性物質を消滅させることはできない。もしできたら、それはノーベル賞もののとてつもない大発見であり、その微生物を応用 すれば現在の原子力発電所よりも遙かに安全で強力な発電所だって造ることができるはずなのだ。そうせずに、単に「放射性セシウムを消去することができる」 という売り文句で、微生物を売っていたら、それはまず間違いなく詐欺である。

(略)

さて、微生物を含む生物は、化学反応を使って生きている。化学反応と核反応では、必要なエネルギーが大ざっぱにいって1000万倍も違う。「放射性セシ ウムを消す」というのは、放射性セシウムの原子核を変化させる、つまり核反応を起こすということである。1000万倍もの差があっては、化学反応では核反 応を起こすだけの大きなエネルギーを発生させることができない。

(略)

「放射性セシウムを消す」ではなく「環境中のセシウムを集めて濃縮する生物」は、ひょっとしたらいる可能性があり、現在も研究や実験が続いている。

しかし、セシウムという元素は、生物が広く細胞内で利用しているカリウムという元素と化学的な性質が似ている。生物はカリウムをどんどん摂取しては排出 していて、溜め込まない。だからこれまでに見つかったセシウムの生物による濃縮は、水銀や鉛の生物濃縮に比べるとずっと、倍率が低い。例えば魚類の生体中 で水銀は10万~100万倍も濃縮される。いっぽう、セシウムはこれまでに見つかった例で、せいぜい100倍程度でしかない。一時期期待されたひまわり も、実用化できるほどセシウムを濃縮しないことが明らかになった。

だから「セシウムを濃縮する微生物」が存在したとしても、除染には目覚ましい効果はないだろう。したがって売り物としては限りなく無意味に近い。

全文は放射能は微生物では消せません

Posted in *日本語.

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