即発線を用いた2次元元素分布測定システムの開発

2D elemental analysis approach in focused neutron beam induced prompt -ray analysis at JAEA

瀬川 麻里子   ; 松江 秀明 ; 関谷 祐二*; 山田 悟*; 篠原 武尚   ; 奥 隆之   ; 笹尾 一*; 鈴木 淳市; 清水 裕彦

Segawa, Mariko; Matsue, Hideaki; Sekiya, Yuji*; Yamada, Satoru*; Shinohara, Takenao; Oku, Takayuki; Sasao, Hajime*; Suzuki, Junichi; Shimizu, Hirohiko

即発線分析(PGA)は、非破壊多元素同時分析が可能であり、発表者らは多元素定量法を確立し、バルク分析等に活用してきた。昨年度よりJRR-3 PGA装置で集光中性子ビームが利用可能となり、集光ビームを利用し、試料を駆動することでサブミリオーダーの元素分布測定を可能とする分析法の開発に着手した。本発表では、(1)PGA装置に設置可能な試料駆動装置の開発,(2)中性子コリメータの最適化,(3)位置分解能特性測定(0.6mmの分解能達成),(4)即発線二次元分布測定結果、について報告する。

Since neutron has the stronger penetration power than those for charged particles, the 2 dimensional prompt -ray analysis method with use of neutron beam is the only way enables the nondestructive, isotopic and position dependent observation on small quantities of samples. Hence, we aimed at developing 2 dimensional prompt -ray analysis systems in focused neutron beam at JAEA with a high resolution within a 1mm. A 2-demeinsinal analysis system is set at JRR-3 prompt -ray system. The neutron beam is 0.6mm FWHM focused and collimated with use of a multichannel parabolic guide and a 6LiF collimator set at 90cm and 1.5 cm upstream with respect to the neutron beam from sample position, respectively. The sample could be stepping drive with 0.1mm. Finally, we succeed to increase the position resolution within 1mm, since we could split two neutron captured -ray peaks from two minute Cd wire-sample, the diameter is 0.25mm and the length is 5 mm, set at 1mm intervals.