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- Material Type
- 規格・テクニカルリポート類
- Author/Editor
- 宮部 昌文大場 正規飯村 秀紀赤岡 克昭丸山 庸一郎若井田 育夫渡部 和男
- Publication Date
- 2008-06
- Publication Date (W3CDTF)
- 2008
- Alternative Title
- Resonance absorption spectroscopy for laser-ablated lanthanide atom, 1; Optimized experimental conditions for isotope-selective absorption of gadolinium (Contract research)
- Periodical title
- JAEA-Research 2008-056
- Target Audience
- 一般
- Note (General)
- 出版タイプ： NA低除染TRU燃料の遠隔同位体分析にアブレーション共鳴吸収分光法を適用するための研究を行った。ガドリニウムを模擬試料として、さまざまなプルームの発生条件や観測条件で吸収スペクトルを測定し、吸収ピークの線幅が狭く、感度も高い条件を調べた。その結果、吸収線幅は、減圧希ガス雰囲気中で生じる低速プルーム成分を観測した場合に最も狭く、重い希ガスほど、より少ない圧力,より遅い観測時刻で狭くなることがわかった。また線幅の最小値は希ガスの種類によらず0.85GHz程度であり、室温のガドリニウム原子で計算されるドップラー幅に近いことがわかった。また、経過時間が10$\mu$s程度になると、基底状態の多重項の中でも上位の準安定状態の緩和が無視できなくなることから、観測に用いる原子の準位エネルギーに応じて、雰囲気ガスの種類を選ぶべきであるとの知見が得られた。For remote isotope analysis of low-decontaminated TRU fuel, we are developing an analytical technique on the basis of the resonance absorption spectroscopy for the laser-ablation plume. To improve isotopic selectivity and detection sensitivity of this technique, we measured absorption spectra of Gd atom with various conditions. As a result, high resolution spectrum was obtained from the observation of slow component of the plume produced under low-pressure rare-gas ambient. The observed narrowest linewidth of about 0.85 GHz was found to be close to the Doppler width estimated for Gd atom of room temperature. Furthermore, relaxation rate of higher meta-stable state was found to be faster than that of ground state, suggesting that use of the transition arising from ground state or lower meta-stable state is preferable for highly sensitive isotope analysis.
- Source
- /JAEA-Research-2008-056.pdf （fulltext）