[1I08-12] Neutron Beam

[1I11] Study of X-ray IP transfer converters for energy-selective neutron imaging with induced radioactivity calculations

*Miki Takeda¹, Hirotaka Sato¹, Takashi Kamiyama¹ (1. Hokkaido Univ.)

Keywords:Energy-selective neutron imaging, Transfer converter, Activation method, X-ray imaging plate, Induced radioactivity calculations

Indirect neutron imaging is one of neutron imaging methods, which activates metal converters with a transmission neutron beam and transfers emitted β-rays from them to an X-ray imaging plate (IP). This method can perform energy-selective neutron imaging because absorption cross-sections of converters depend on the neutron energies. Therefore, we chose suitable elements as the converters for each neutron energy by using PHITS and D-CHAIN, considering the use of HUNS. We intended to use 1/v absorption, resonance absorption, and threshold nuclear reaction for thermal, epithermal and fast neutrons, respectively. The optimum neutron converters for each energy were chosen by considering not only energies of β-rays of β-ray emitting nuclides produced in the converters but also time variations of the radioactivity.