Application of laser-induced photoacoustic spectroscopy for determination of plutonium concentration in nuclear waste solutions

レーザー誘起光音響分光法を適用した液体廃棄物中のプルトニウムの定量

駿河谷 直樹 ; 佐藤 宗一 ; 実方 秀*; 綿引 優

Surugaya, Naoki; Sato, Soichi; Jitsukata, Shu*; Watahiki, Masaru

レーザー誘起光音響分光法による硝酸溶液中のPuの測定を試みた。PuはCe(IV)により定量的にPu(VI)酸化され、光音響信号を取得した。光音響信号はPu(VI)の最大吸収波長である830.5nmを用いて測定され、その強度は濃度に一次に比例し定量性が示された。検出下限は0.5g/mLと評価され、本法による液体廃棄物中のPuの定量に適用できた。

Laser-induced photoacoustic spectroscopy was demonstrated in a quantitative analysis of Pu in nitric acid medium. Plutonium was quantitatively oxidized to Pu(VI) using Ce(IV). The photoacoustic measurement of Pu(VI) with maximum absorption at 830.5 nm was subsequently performed to determine the concentration. The photoacoustic signal was linearly proportional to the Pu(VI) ion concentration. The detection limit of Pu(VI) was estimated to be 0.5 g/mL. By the proposed method, Pu concentration was successfully determined in a nuclear waste solution for use in nuclear materials management.