铅硼聚乙烯复合材料的制备及辐射屏蔽机制

Preparation and Radiation Shielding Mechanism of Lead-Boron-Polyethylene Composites

为了有效保护人员和设备免受辐射危害,同时扩大材料的应用范围,研究铅硼聚乙烯复合材料的制备及辐射屏蔽机制。预处理并修饰含硼化合物,将其与铅砂及聚乙烯混合,制备出铅硼聚乙烯复合材料。选取Cs辐射源,利用蒙特卡罗中子-光子输运程序作为验证屏蔽机制的模拟程序,构建复合材料模型与Cs辐射源模型,计算中子屏蔽系数,考虑复合材料的密度与厚度,模拟不同射线能量之下,辐射X射线的屏蔽性。实验结果显示:中子系数降低时,增加所制备复合材料的密度,屏蔽热中子系数出现升高现象;复合材料密度为5.9 g/cm^(3)、厚度为4.5 cm时,能够满足辐射屏蔽机制需求。

In order to effectively protect personnel and equipment from radiation hazards and expand the application range of materials,the preparation and radiation shielding mechanism of lead boron polyethylene composite materials are studied.Preprocess and modify boron containing compounds,mix them with lead sand and polyethylene to prepare lead boron polyethylene composite materials.Select Cs radiation source and use Monte Carlo neutron photon transport program as the simulation program to verify the shielding mechanism.Construct a composite material model and Cs radiation source model,calculate the neutron shielding coefficient,consider the density and thickness of the composite material,and simulate the shielding performance of radiated X-rays under different radiation energies.The experimental results show that when the neutron coefficient decreases,increasing the density of the prepared composite material leads to an increase in the shielding thermal neutron coefficient;When the density of the composite material is 5.9 g/cm^(3) and the thickness is 4.5 cm,it can meet the requirements of radiation shielding mechanism.