A Neutron Detector Having Uniform Sensitivity from 10 Kev to 3 Mev

Abstract

A neutron detector having approximately uniform sensitivity from 10-kev neutron energy to 3-Mev energy is described. The arrangement, known as a long counter, consists of a paraffin cylinder about 10\ensuremath{''} outer diameter \ifmmode\times\else\texttimes\fi{}12\ensuremath{''} long surrounding a long boron trifluoride proportional counter. Sensitivity curves are given for two of the best arrangements. The response is flat over the above range to about 10 percent.