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在定量中子照相散射校正时需要考虑中子转换屏对不同角度入射中子的响应,中子转换屏的角度响应研究在中子照相散射校正中具有很重要的意义。本文在理论上推导中子转换屏的角度响应的解析式,并利用蒙特卡罗程序MCNP5对该解析式进行验证。利用蒙特卡罗方法对中子转换屏角度响应的影响因素进行研究。给出中子转换屏的角度响应与转换屏厚度以及入射中子能量之间的关系,中子转换屏的角度响应随着转换屏的厚度增大而增大,随着入射中子能量的增大而减小,并得到~6LiF-ZnS(Ag)转换屏的最佳厚度为0.3 mm。
In neutron photon scattering correction, the response of neutron conversion screens to neutron at different angles needs to be considered. The study on the angle response of neutron conversion screens is of great significance in the neutron scattering correction. In this paper, the analytic formula of the angular response of the neutron conversion screen is deduced in theory, and the analytical expression is verified by the Monte Carlo program MCNP5. The influence factors of angle response of neutron conversion screen are studied by using Monte Carlo method. Given the relationship between the angular response of the neutron conversion screen and the thickness of the conversion screen and the incident neutron energy, the angular response of the neutron conversion screen increases with the thickness of the conversion screen. As the incident neutron energy increases Large and reduced, and get ~ 6LiF-ZnS (Ag) conversion screen the best thickness of 0.3 mm.