Energy-selective neutron imaging of radioactive samples used for neutron capture reaction measurements

Segawa, Mariko   ; Toh, Yosuke   ; Kai, Tetsuya   ; Kimura, Atsushi   ; Nakamura, Shoji  

In this study, several sealed radioactive samples used for neutron capture reaction measurements were visualized using an energy-resolved neutron imaging technique at Beam line No.4 (ANNRI), installed in the J-PARC Materials and Life Science Experimental Facility. To derive physical quantities related to the neutron capture reactions, it is important to check the internal state of the sealed samples, such as with or without crack and uniformity. We demonstrated images with enhanced contrast in corresponding resonance energy regions for the radioactive samples by the present technique, and verified the state inside of the samples from the obtained images.