The design of shielding materials mainly considers the protection requirements against neutrons and γ-rays,and materials with synergistic protection against both neutrons and γ-rays,which can be widely used in many radiation scenarios.In this paper,the types,advantages and disadvantages of shielding materials were introduced,and based on the Monte Carlo N-particle (MCNP) transport code program,the design and optimization of neutron and γ-ray shielding materials were carried out.The design scheme of a novel neutron and γ-ray shielding material with better shielding effect was proposed.The simulation results showed that adding a certain amount of B4C into paraffin wax could significantly improve the shielding efficiency of the material against neutrons.Among them,the boron-containing paraffin with the addition amount of 10wt%～20wt% B4C had an excellent neutron shielding effect.The shielding rate of the designed 75mm boron-containing paraffin (10% B4C)/1mm Pb multilayer shielding materials against Pu spontaneous fission neutrons and Pu decay γ-rays was 96.8% and 93.5%,respectively.The shielding rate against Pu decay γ-rays could reach 96.5% by increasing the thickness of the Pb layer to 2mm.The article carried out research on the preparation technology of boron-containing paraffin shielding materials that could achieve fast neutron moderation and absorption dual functions,and prepared boron-containing paraffin shielding materials with dense structure and excellent processing performance through cold pressing preparation technology,which could solve the problems of size limitation and difficult processing and forming of shielding materials,and could be widely used in industrial radiation protection fields.
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基金资助
国防科工局(FRL202001)
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