Measurement of High Energy Neutron Fluence with Scintillation Detector and Proton Recoil Telescope

Abstract

The consistency of spectral neutron fluence determination with a liquid scintillation detector using time-of-flight techniques and fluence measurements with a proton recoil telescope is investigated in the neutron energy region between 20 and 70 MeV. If the full detector response including contributions from neutron reactions with carbon nuclei is used for the fluence determination with the scintillation detector, the results deviate up to 15% from measurements with a proton recoil telescope which is based exclusively on n-p scattering. Good agreement has been found if only events due to n-p scattering are used for the analysis of scintillation detector measurements.