HL-2A中子相机屏蔽系统模拟

利用蒙特卡罗模拟程序，建立了HL-2A中子相机蒙特卡罗粒子输运(MCNP)物理模型，对D-D聚变中子和γ射线的屏蔽进行了模拟计算。对石蜡碳酸锂混合物、聚乙烯、铅和316L不锈钢4种常用中子慢化吸，收剂组成的屏蔽层材料的屏蔽效果进行了对比。计算结果表明，石蜡碳酸锂混合物和铅组合是中子相机的最佳屏蔽层材料，其中石蜡碳酸锂混合物用于慢化吸收中子，铅用于屏蔽中子和γ射线。此外，利用MCNP模拟计算得到了屏蔽中子和γ射线所需的屏蔽厚度，以及准直管的中子散射率。

Simulation on shielding system of neutron camera for HL-2A

The physical model of the neutron camera Monte-Carlo partical transport (MCNP) for HL-2A was established by using Monte-Carlo simulation code. The shielding of D-D fusion neutrons and gamma rays was simulated. The shielding effects were compared for four common shielding materials, including mixture of paraffin lithium carbonate, polyethylene, lead, 316L stainless steel. Calculation results show that mixture of paraffin lithium carbonate and lead are the best shielding materials for neutron camera, among them the mixture of paraffin lithium carbonate is used for slowing-down and absorpting neutrons, while lead is used for blocking neutrons and gamma rays. In addition, both the required thickness of shielding material for neutron and gamma ray and the neutron scattering rate of collimator tube have been obtained by using MCNP simulation.