Simulation of photon attenuation coefficients for high effective shielding material Lead-Boron Polyethyene

[摘要] The mass attenuation coefficient of various Lead-Boron Polyethylene samples which can be used as the photon shielding materials in marine reactor, have been simulated using the MCNP-5 code, and compared with the theoretical values at the photon energy range 0.001MeV-20MeV. A good agreement has been observed. The variations of mass attenuation coefficient, linear attenuation coefficient and mean free path with photon energy between 0.001MeV to 100MeV have been plotted. The result shows that all the coefficients strongly depends on the photon energy, material atomic composition and density. The dose transmission factors for source Cesium-137 and Cobalt-60 have been worked out and their variations with the thickness of various sample materials have also been plotted. The variations show that with the increase of materials thickness the dose transmission factors decrease continuously. The results of this paper can provide some reference for the use of the high effective shielding material Lead-Boron Polyethyene.

[发布机构] Department of Nuclear Science and Engineering, Naval University of Engineering, Wuhan; 430033, China^1

[关键词] Atomic compositions;Linear attenuation coefficients;Marine reactors;Mass attenuation coefficients;Photon attenuation coefficients;Photon energy range;Shielding materials;Theoretical values