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Accurate purification age determination of individual uranium-plutonium mixed particles

単一ウラン-プルトニウム混合粒子の正確な精製時期測定

宮本 ユタカ; 鈴木 大輔; 江坂 文孝; 間柄 正明

Miyamoto, Yutaka; Suzuki, Daisuke; Esaka, Fumitaka; Magara, Masaaki

様々なU/Pu比からなるウラン-プルトニウム混合単一粒子の年代を誘導結合型質量分析法で測定した。ミクロンサイズの粒子をU, Puの標準物質から調製した。Pu標準物質は精製時期が既存で4$$sim$$6年経過したものである。化学分離したPuとAmの3つの同位体比の積で得られる$$^{241}$$Am/$$^{241}$$Pu比からPu精製時期を得た。試料のAm, UそしてPuは一本の小さな陰イオン交換カラムで逐次分離を行った。試料溶液に高純度の$$^{243}$$Amスパイクを添加することで$$^{241}$$Am/$$^{241}$$Pu比を正確に測定できた。様々なU/Pu比を持つ粒子の精製時期の測定結果は推奨値と高い正確さおよび精度で一致した。

Age of individual uranium-plutonium mixed particles with various U/Pu atomic ratios were determined by inductively-coupled plasma mass spectrometry. Micron-sized particles were prepared from U and Pu certified reference materials. The Pu reference was stored for 4-6 years since the last purification. The Pu purification age was obtained from the $$^{241}$$Am/$$^{241}$$Pu ratio which was calculated from the product of three measured ratios of Pu and Am isotopes in the eluted fractions. Am, U and Pu in a sample solution were sequentially separated a small anion-exchange column. The $$^{241}$$Am/$$^{241}$$Pu ratio was accurately determined by spiking pure $$^{243}$$Am to the sample solution. The determined age of particles with various U/Pu ratios was in good agreement with the expected age with high accuracy and high precision.

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パーセンタイル:61.62

分野:Biochemical Research Methods

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