Design of Current Mode Wide-band Semicondutor Detector for Reactor Fast Neutron Fluence Rate Measurement

In order to solve the problem of fast neutron fluence rate real-time measurement in intense neutron-gamma mixed field, a new neutron fluence rate measurement scheme based on recoil proton method and semi-insulating (SI) GaN detector was proposed. The compensation current parallel structure with graphite balancer and polyethyene converting target for fast neutron fluence rate detection, which effectively reduced the interference of γ ray and improved detection sensitivity of neutron radiation, was used in this scheme. This fast neutron fluence rate measurement scheme was implemented in the mixed field of Xi’an Pulsed Reactor 1# radial channel, and the results show consistency with previous measurement results and the validity of the scheme.