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Batsaikhan, M.; 赤岡 克昭; 佐伯 盛久*; 狩野 貴宏; 大場 弘則; 若井田 育夫
Journal of Nuclear Science and Technology, 13 Pages, 2023/00
被引用回数：1 パーセンタイル：68.31(Nuclear Science & Technology)この実験研究では、レーザー誘起ブレークダウン分光法(LIBS)を用いて模擬燃料デブリの二次元元素マッピングを実行し、サンプル表面の元素組成と分布を決定した。本物の燃料デブリはサンプルとして入手できないため、化合物や金属などの予測材料から模擬燃料デブリを作製した。Nd:YAGレーザーの第2高調波を使用して、サンプル表面にプラズマを生成させた。さらに、エシェル分光器を使用して、435
650nmの可視波長範囲でプラズマからの発光を検出した。収集されたデータセットのサイズと複雑さから従来のデータ分析方法では良い効果が得られないことが判明した。そのため本研究では、主成分分析や多変量曲線分解能代替最小二乗法などのラベルフリー化学測定法に基づく方法を実装して、サンプル内の各成分に関する空間情報およびスペクトル情報を取得した。結果として、LIBSと化学測定法の統合が、事前知識がほとんどまたは全く無くてもサンプル(燃料デブリなど)に関する定性情報を取得するための非常に効果的なツールであることを実証した。
Batsaikhan, M.; 狩野 貴宏; 柴田 卓弥; 赤岡 克昭; 若井田 育夫
no journal, ,
Severe accident at Fukushima Daiichi Nuclear Power Station (1F) of Tokyo Electric Power Company Holdings (TEPCO) occurred after strong earthquake and massive tsunami. Since after the accident, many efforts to decommissioning of the 1F moving forward steadily and safely. It is important to realize a measurement technique that can distinguish fuel debris from other materials. In the present study, we focused on Laser Induced Breakdown Spectroscopy (LIBS) which is considered as a promising remote, in-situ and radiation tolerance technique for fuel debris inspection of the 1F. Although the LIBS is a point measurement technique, it has been used as elemental surface mapping technique in many fields, because it allows user to realize fast spatial scanning without any sample preparation. In this presentation, measurement result of 2D elemental mapping by LIBS on simulated fuel debris sample under atmospheric pressure and without radiation environment will be discussed.
Batsaikhan, M.; 大場 弘則
no journal, ,
Laser-induced breakdown spectroscopy allows us to perform remote and rapid measurements with little or no sample preparation. And also, there have been continuous efforts to apply LIBS to nuclear material analysis. In the current situation, the inside of the Fukushima Daiichi Nuclear Power Station is filled with nitrogen gas. This time, we report and discuss the results of the fundamental plasma characteristics of Cu, Fe, and Zr elements in ambient gas. Plasma emission formed at the Fe, Cu, and Zr metals in the air at atmospheric pressure was collected as a function of lens-to-sample distance. As an example, the resulting spectra of Fe, the strongest intensity from Fe, O, and N was observed at lens-to-sample distance = 0 and all measurements in the present work were performed at this position. We will discuss the plasma temperature of each element and gas.
Batsaikhan, M.; 大場 弘則; 若井田 育夫
no journal, ,
Laser Induced Breakdown Spectroscopy (LIBS) technique has been considered a promising analytical technique for the elemental composition of fuel debris (including Gd-thermal neutron absorber in some fuel rods) formed inside reactor vessels at FDNPP. However, accurate controlling of the laser focusing position is important to create plasma on the sample surface and to achieve the best analytical performance when the LIBS technique is applied to the in-situ and on-site investigation of nuclear fuel debris at FDNPP where various targets having different sizes and shapes must be recognized and analyzed in a short time under high radiation environment. The objective of the present study is to develop a method for the simultaneous measurement of elemental distribution and surface imaging of nuclear fuel debris using acoustic wave-assisted microchip LIBS system.
Batsaikhan, M.; 大場 弘則; 狩野 貴宏; 赤岡 克昭; 若井田 育夫
no journal, ,
An acoustic-wave assisted microchip LIBS (AW-mLIBS) system was developed for simultaneous measurement of elemental mapping and surface recognition of fuel debris at the Fukushima Daiichi Nuclear Power Plant. In this presentation, an experimental study on the two-dimensional elemental mapping of Gadolinium (Gd) in a surrogate debris sample and surface imaging of the sample by the AW-mLIBS system will be presented.
