Epithermal neutron detector having enhanced efficiency

摘要

A neutron detector sensitive principally to epithermal neutrons is disclosed. In a preferred embodiment of the invention, a neutron counter is substantially surrounded by a reflector composed of material having a high neutron scattering cross section. The reflector is then wrapped in a shield which is composed of a thermal neutron absorber. In a specific embodiment of the invention, the counter, reflector and shield are mounted inside a neutron moderator which can be composed of plastic.