A First-Order Approximation to Fast-Neutron Penetration Spectra for Non-Normally Incident Neutrons on Water Slabs

Angular dependent fast-neutron penetration spectra have been calculated and experimentally measured for fast neutrons non-normally incident on water slabs. Previously reported work has included a comprehensive set of experimental measurements for angular dependent penetration spectra measured for poly energetic fast neutrons normally incident on water slabs. Corresponding Monte Carlo calculated results were in good agreement and were tabulated for direct calculations of penetration spectra for complex geometries. The results of the experiments described here extend the applicability of these results for normal incidence to certain cases of non-normal incidence.