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

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

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.