SPECTRALLY MATCHED NEUTRON DETECTORS

摘要

A neutron detector element (200) for replacement of a 3He-based neutron detector element that includes two elongated 10B-lined (212) neutron detector tubes (210) spaced apart from each other and filled with 4He (214) at a predetermined pressure. The 10B-lined (212) neutron detector tubes (210) are disposed so as to have an adjoint function (310) over a predetermined spectrum of neutron energies within a predetermined bias threshold of a corresponding adjoint function of the 3He-based neutron detector element over the predetermined spectrum of neutron energies. A block of a neutron moderator material (220) surrounds the two elongated 10B-lined (212) neutron detector tubes (210). The block of moderator material has dimensions so as to be able to fit a space for the 3He-based neutron detector element (200) in a neutron detecting system (400).