X光管滤光片效应的蒙特卡罗仿真

The filter effects in X-ray tube XRF simulated by using the MCNP5 code

在X射线荧光分析中,使用滤光片可有效降低原级光谱本底对待测元素的干扰,提高分析灵敏度。本文采用MCNP5方法仿真X光管滤光片对原级谱线的影响,比较了滤光片对不同能量电子束产生的X射线谱的差异,分析了不同滤光片材料及厚度与X射线原级谱衰减的关系,得到不同滤光片对X射线谱的衰减规律。

In X-ray fluorescence （XRF） analysis, the use of filter reduces the background interference effectively, and improves the analysis sensitivity. In this paper, the MCNP5 code is used to simulate the filter effects in X-ray tube XRF. The XRF spectra by 140 keV electron beams, with filters of different materials and thicknesses, are compared. Their attenuation rates, i.e. background reduction from the original XRF spectra, are analyzed.