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保障措置分析のためのネオジムを内標準物質とした吸光光度法による高放射性廃液中のプルトニウムの定量

Determination of Plutonium in High Active Liquid Waste by Spectrophotometry using Neodymium as an Internal Standard for Safeguards Analysis

田口 茂郎; 駿河谷 直樹; 佐藤 宗一; 北尾 貴彦; 雛 哲郎; 檜山 敏明

Taguchi, Shigeo; Surugaya, Naoki; Sato, Soichi; Kitao, Takahiko; Hina, Tetsuro; Toshiaki, Hiyama,

東海再処理施設では、高放射性廃液中に含まれる、微量のPu(数十$$sim$$数百mg L$$^{-1}$$)を検認するための分析法として、同位体希釈質量分析法(Isotope Dilution Mass Spectrometry; IDMS)を適用している。IDMSによる分析は、操作が煩雑であるとともに、査察側が、施設で収去した高放射性廃液試料の一部を保障措置分析所へ輸送して測定を行う必要があることから、検認の適時性を確保することが困難であった。そこで、この問題を解決する分析法として、操作が簡便で迅速な測定が期待できる吸光光度法の適用を図った。また、Ndを内標準物質として利用することにより、Puを定量する方法を採用し、本検認分析のオーセンティケーション手法を提案した。基礎試験を経た後、高放射性廃液試料を用いて、本法とIDMSによる並行分析を実施した結果、両者は良好に一致し、実査察における検認分析法としての適用の見通しが得られた。

For the determination of Pu in the high active liquid waste (HALW), isotope dilution mass spectrometry (IDMS) has been applied to verification analysis at Tokai Reprocessing Plant. IDMS has been considered as the most reliable analytical technique for accountability measurement of Pu in spent fuel reprocessing plant. However, it takes quite long time for inspector to obtain an analytical result because inspection sample has to be transported to safeguards analytical laboratory for off-site analysis. In order to overcome this disadvantage, a rapid verification analysis of Pu in HALW by conventional spectrophotometer using Nd as an internal standard was proposed to achieve on-site verification measurements. In this method, Nd standard is intended to be provided by International Atomic Energy Agency (IAEA) so that an inspector can independently control it not only as an internal standard but also as an authentication purpose. The validation analysis was carried out by comparing with IDMS. It was found that the values of Pu concentration obtained by proposed method were in good agreement with those obtained by IDMS. Therefore the proposed method can be expected for the application to the verification analysis.

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