基于MCNP的电子加速器靶材料特性研究

摘要

本文运用MCNP程序模拟研究了不同加速器靶（W，Ni，Cu，Au）在不同条件下韧致辐射效率、光子产额以及光子能谱，计算结果表明，韧致辐射效率随着靶核密度的增加而增大，选择了钨靶作为最佳加速器靶核，并计算得到了钨靶最佳韧致辐射厚度随入射电子能量变化的关系式。同时模拟分析得到了光子能谱与入射电子能量和靶核厚度的关系，结果表明，电子能量和靶核厚度的增加都能使光子能谱硬化。%This paper uses MCNP to simulates and studies the bremsstrahlung radiation efficiency, light quantum yield, and the photon energy spectrum of different accelerator targets (W,Ni,Cu,Au) in different conditions. The calculation result shows that bremsstrahlung radiation efficiency increases with the increase of target nuclear density, so W target is selected as the optimal accelerator target nucleus, and the equation of tungsten target bremsstrahlung best thickness changing with incident electron energy is obtained through calculation. At the same time, the relationship between photon energy spectrum and the incident electron energy and the thickness of the target nucleus is obtained through analysis. The result shows that the increase of electronic energy and thickness of the target nucleus can both harden the photon energy spectrum.