Development of three-dimensional prompt -ray analysis system

Segawa, Mariko   ; Matsue, Hideaki ; Kureta, Masatoshi   

We developed a three- dimensional neutron induced prompt -ray analysis (3D-PGA) system taking -ray spectrum by anti-Compton Ge-detector. This system is one of the promising ways which enables the nondestructive and isotopic observation for internal structure on samples, since neutron beam strongly penetrates material and picks up information on several elements and isotopes. Here, the 3D imaging algorithms that can be employed in this system include computed tomography method which can re-construct position of elements inside samples, measuring -ray from neutron capture reaction by several elements on a sample in three different directions with use of a collimated neutron beam. The present system had a position resolution with the order of mm reducing background -ray caused by several materials used as shields for scattered neutrons on a sample position. Finally, the outline of this system is presented with some performance tests.