Threshold detector with hydrogeneous scatterer

A threshold detector designed for recording time dependence of fast neutron flux density in the energy range > 1.5-3.0 MeV in pulsed fields of nuclear reactors is described. The invention is aimed at increasing the accuracy of recording when conserving the possibility of gamma radiation signal compensation. Detector electrodes are made as plates with the thickness more than the avearge length of recoil proton paths and they are seperated between each other and the body by three layers of heterogeneous dielectrics. In this case the thickness of the dielectric arranges between electrodes are larger, and the thickness of two another ones arranged between electrodes and the body, are less than the average length of recoil proton paths. As opposite variant, when the thickness of the dielectrics arranged between electrodes is less and the thickness of two others larger than the average length of recoil proton paths, is possible. The detector suggested with a hydrogeneous scatter in comparison with analogous detectors allows to increase the accuracy of neutron detection by 50-60%