Measurements of Fission Neutron Spectra Transmitted through Iron, Heavy Concrete, Polyethylene and Graphite Slabs

Abstract

Measurements of transmitted neutron spectra through slabs of iron, heavy concrete, polyethylene and graphite are shown. The experiments are done using collimated fission neutrons from a ²⁵²Cf source. To verify the results, multigroup Monte Carlo calculations are done. Fairly good agreement is shown between spectra obtained by experiments and calculations. Some discrepancies shown between them are thought to come from inaccuracies in the cross section data used in the calculations.