Elemental distribution measurement for Au-In-Cd alloy with resonance absorption neutron imaging technique

Oi, Motoki ; Harada, Masahide   ; Teshigawara, Makoto   ; Maekawa, Fujio  ; Hashimoto, Eiko; Segawa, Mariko   ; Kureta, Masatoshi   

We proposed a Au-In-Cd alloy as a new low-activation decoupler material of JSNS (Japan Spallation Neutron Source) moderators. To realize the Au-In-Cd alloy decoupler, we tried to make small Au-In-Cd alloy specimens. Then confirm uniformity of the three elements in the specimens, we attempted to measure elemental distributions in a specimen by the resonance absorption neutron imaging technique with the pulsed neutron beam available at J-PARC. The experiment was performed at the NOBORU instrument (BL10). We used the single flame camera imaging system. The imaging system consists of a scintillator plate, optical lenses, an image intensifier and a camera. Images were taken in several time ranges that correspond to the resonance energies of the elements. As a results, we can see only one of three elements in the image and it was confirmed that the indium was distributed almost uniformly over the specimen.