Comparison study of reflected and transmitted thermal neutron flux in water and other moderators

Abstract

Systematic measurements of the reflected and transmitted thermal neutron flux for different thicknesses of oil, glycerin, water and sand were carried out using 252Cf and Am-Be neutron sources and two independent BF3 sensitive detectors. The reflection parameter (albedo) for different sample thicknesses was calculated. The geometrical effects on transmitted thermal neutron flux were studied. The results obtained showed strong effects of both hydrogen and carbon on the transmitted and reflected thermal neutron flux. High concentration of hydrogen indicates high reflection parameter.