The neutron and gamma-ray shielding properties of concrete containing different proportions of barite as
an aggregate have been investigated. The macroscopic fast neutron removal cross-sections have been calculated and compared with the attenuation of gamma-rays with 8 MeV photon energy, because for most
shields the neutron produced at 8 MeV are most likely to penetrate. The calculation of neutron removal
cross-section has been done by using NXcom program and the photon linear attenuation coefficients
were obtained via XCOM code. The best values of barite proportion and density of concrete for maximum
shielding against both neutrons and gamma-rays have been determined graphically. The transmission of
both gamma rays and neutrons has been obtained as a function of thickness of concrete for all concrete
types. It was found that increasing barite proportion in the concrete increased the gamma attenuation
coefficient while it decreased the neutron removal cross-section.