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Quantitative measurements of element distributions using the neutron-transmission resonance-absorption method

中性子透過共鳴吸収法を用いた元素分布の定量測定

原田 正英; Parker, J. D.*; 澤野 達哉*; 窪 秀利*; 谷森 達*; 篠原 武尚; 前川 藤夫; 酒井 健二 

Harada, Masahide; Parker, J. D.*; Sawano, Tatsuya*; Kubo, Hidetoshi*; Tanimori, Toru*; Shinohara, Takenao; Maekawa, Fujio; Sakai, Kenji

研究の目的は、$$mu$$PIC検出器を用いて、中性子共鳴吸収のテスト実験を行い、その定量性を確認することである。検出器は、NOBORUの分光器室内のモデレータから14.5mに設置した。試料は、厚さ5, 10, 20, 100$$mu$$mのタンタル箔を用い、検出器の15cm上流に設置した。実験では、試料の有り無しでの透過スペクトルを測定した。この測定では、バックグランド成分は小さくない。そこで、中性子輸送計算より、バックグランド成分の源は、分光器室内の散乱中性子であることを確認した。そこで、測定データから、バックグランド成分を差し引いた。最終的に、実験値と核データとの差は、7%程度であることがわかった。

The purposes of this study are to perform Neutron Resonance Absorption NRA test experiments using the Micro Pixel Chamber, and to confirm its quantitativity. The detector was located at 14.5 m from the moderator in the experimental room of NOBORU. The samples, consisting of thin Tantalum (Ta) foils, with thicknesses of 5, 10, 20 and 100 $$mu$$m, were placed individually at 15 cm upstream from the detector. In the experiment, the transmission spectra with the Ta samples and no sample were obtained. Background components were not so small in these measurements. From the neutron transport simulation, it was surmised that the origin of this background was due to scattering of neutrons in the experimental room. Therefore, the assumed background components were subtracted from the measurement data. Finally, it was found that the difference between the measurement data and the nuclear data was within about 7%.

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