Development of a pulsed neutron three-dimensional imaging system using a highly sensitive image-intensifier at J-PARC

Segawa, Mariko   ; Oi, Motoki ; Kai, Tetsuya   ; Shinohara, Takenao   ; Kureta, Masatoshi   ; Sakamoto, Kensaku ; Imaki, Tadashi*

In order to realize neutron energy resolved three-dimensional (3D) imaging at resonance neutron energy region, a camera system coupled with a high sensitive and high frame-rate gating image-intensifier was developed. The resonance absorption 3D imaging was successfully demonstrated at pulsed neutron source of Japan Proton Accelerator Research Complex (J-PARC). The camera system allowed us to obtain a Time-of-flight (TOF) image of 2352 (W) 1726 (H) pixels resolved into a narrow energy range. The 3D images having enhanced contrast at corresponding resonance energy regions for cylindrical Au, Ta and In samples were reconstructed by "Convolution Filtered Back-Projection (FBP)" and "Maximum Likelihood Expectation Maximization (MLEM)" methods. And qualities of spatial resolutions in the depth direction were evaluated to be about 1 mm experimentally. The results obtained in the present experiments showed that the system could have the ability to adjust the practical use in the industrial field.