Measurement of thermal neutrons reflection coefficients for two-layer reflectors.

In this research, thermal neutrons albedo coefficients and relative number of excess counts have been measured experimentally for different thicknesses of two-layer reflectors by using Am-Be neutron source (5.2Ci) and BF detector. Our used reflectors consist of two-layer which are combinations of water, graphite, polyethylene, and lead materials.

Investigation of gamma-ray shielding properties of concrete containing different percentages of lead.

In this work, concrete mixed with different percentages of lead is used to study gamma-ray shielding properties. The transmitted fluxes of gamma-rays that were emitted from (137)Cs and (60)Co sources were detected by a NaI(Tl) detector and analyzed by a MCA analyzer. Then, linear attenuation coefficients (LAC) and compressive strength of concrete specimens were experimentally investigated.