Neutron response function for a detector with 3He counters for the 0.39-1.54Â MeV neutron energy range

An experimental study was carried out on the neutron response functions of two neutron detector arrays consisting of 39 3He proportional counters with a polyethylene moderator for monoenergetic neutrons within the 0.39-1.54 MeV neutron energy range. Experimental data on the sensitivity of neutron counting to a change in neutron energy and the influence of the thickness of polyethylene moderator were obtained. The experimental efficiency curves were compared with the calculated response functions generated by a neutron transport code.