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

透過中性子共鳴吸収法を用いた元素分布の定量測定

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

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

Neutron Resonance Absorption method (NRA) which is one of the imaging methods is very suitable for nondestructive analysis of element distributions in a sample. In this study, the NRA test experiments used by Micro Pixel Chamber ($$mu$$PIC) developed by Kyoto University as a detector were done at NOBORU in J-PARC to confirm the quantitativity. The detector was located at 14.5 m from the moderator. A sample was located at 15 cm upstream from the detector. Neutron intensity, neutron irradiation field size and $$gamma$$-ray intensity were controlled by a rotary collimator, slits and a filter exchange device. Thin tantalum foils of 20 $$mu$$m and 100 $$mu$$m in thickness were used as a sample. Transmittance spectra were obtained from the measured transmission spectra with and without the samples. It was found that the measurement error in case of the tantalum sample of 100$$mu$$m in thickness was within about 7% compared with nuclear data.

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