γ源辐射角度对光子高度计性能的影响分析

为了研究分析月球环境下γ光子高度计源辐射角度对其性能的影响，文章建立了月球着陆器简化模型，利用基于蒙特卡罗方法的粒子输运程序（MCNP）软件仿真计算了接收处理器捕获的光子计数随γ源辐射角度的变化规律。仿真结果表明：辐射角度小于一定值时，光子计数随着辐射角度的增大近似呈线性增长；当γ源辐射角度增大到一定值时，光子计数基本不再有变化。文章的分析方法和结果可以为合理确定γ光子高度计源辐射角度提供设计参考。

Analysis of Effect ofγ Radiation Angle on the Photons Altimeter

In order to find out the effect of radiation angle on the gamma photons altimeter in the lunar environment, in this paper, lunar lander models are estublished and simulated with MCNP program, and the captured photons countings corresponding to the angle of the gamma radiation source at different heights are calculated. The results show that when the radiation angle is less than a certain value, the photons counting increases linearly with increasing radiation angle while the angle increases to a specific value, the photon counting basically holds the same. Analysis of the article can provide the theoretical basis for reasonably determining the gamma source radiation angle.