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共鳴吸収法を用いたアブレーションプルーム中の粒子の膨張挙動; チタンとハフニウムの中性原子の挙動比較

Expansion characteristics of particles in ablation plume measured with resonance absorption spectroscopy; Comparison of neutral atoms of titanium and hafnium

Jung, K.; 宮部 昌文; 赤岡 克昭; 大場 正規; 若井田 育夫

Jung, K.; Miyabe, Masabumi; Akaoka, Katsuaki; Oba, Masaki; Wakaida, Ikuo

ジルコニウムやウランなどが混在する放射性廃棄物の分析のために、レーザーアブレーション共鳴吸収分光法を利用する分析手法の開発を行っている。本手法を適用するためには、分析対象の粒子が作るプルームの特性評価が必須である。そこで本研究ではZrと化学的性質が似ているチタンとハフニウムを測定対象とし、粒子の重さによるプルームの膨張挙動の違いを調べた。実験の結果、背景ガスの影響は重いHfより軽いTiに対して大きくなることが分かった。本研究により、核燃料物質と原子炉材料が混在する廃棄物試料の共鳴吸収信号の意味を理解し、実験条件を最適化するための基礎的知見が得られた。

We are developing an analytical method using laser ablation absorption spectroscopy (LAAS) to analyze radioactive waste mixed with zirconium, uranium and so on. It is essential to evaluate the characteristics of the plume formed by the objective particles for LAAS analysis. Therefore, in this study, titanium and hafnium whose chemical properties are similar to those of Zr were chosen as analytical object. And the difference in expanding behavior of the plume due to the weight of the particles was investigated. As a result of changing the height of the probe beam and applying the optical time-of-flight method to the plume, it was found that the influence of the background gas is larger for Ti than Hf. The meaning of the resonance absorption signal of the waste sample mixed with nuclear fuel materials and nuclear reactor materials was understood by this study and basic knowledge to optimize experimental conditions were also obtained.

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