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焼却灰,セメント固化体に含まれるアクチノイド元素の分析

Analysis of actinide elements in ash and cement solidified products

島田 亜佐子 ; 亀尾 裕 ; 高橋 邦明 

Shimada, Asako; Kameo, Yutaka; Takahashi, Kuniaki

抽出クロマトグラフィを用いる既報のPuとAmの分離スキームにNpの分離操作を加え、1つの樹脂でこれら3つの元素を分離するスキームを検討した。また、その結果をふまえ、可燃性廃棄物の焼却灰とセメント固化体試料に含まれるPu, AmとNpを分析した。これまでと同様に、PuとAmは80%以上の回収率が得られ、精度よく定量できた。Npの画分には数%のPuやAmなどが検出されたが、Npの定量には影響がなかった。Np画分にはUも溶出していると推測されるが、$$alpha$$線源をフッ化サマリウム共沈により調製したため、6価のUは共沈せず、$$^{234}$$Uの影響を受けずに$$^{237}$$Npを定量できたと考えられる。以上のことから、PuとAmに加え、Npも一つの樹脂で分析できることがわかった。

Neptunium separation procedure was added into reported separation scheme of Pu and Am to construct analytical scheme of Pu, Np, and Am using one extraction chromatographic column. Based on the result, Pu, Np, and Am in ash of inflammable waste and cement solidified waste were analyzed. Plutonium and Am were determined accurately and more than 80% of recoveries were obtained. Although a few % of Pu and Am were detected in Np fraction, they did not influence the determination of Np. Uranium was considered to exist in the Np fraction. However, U(VI) was not co-precipitated with samarium fluoride. Because $$alpha$$ source was prepared by co-precipitation with samarium fluoride, determination of $$^{237}$$Np was not influenced by $$^{234}$$U. It was found that Pu, Np, and Am could be separated by one extraction chromatographic column.

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