在EDXRF分析中,X射线荧光计数率与待测元素种类和含量有密切关系.但X射线荧光计数率又与很多因素有关,其中X光管、样品和探测器的几何位置关系是一个重要的影响因素.为了设计较好计数率的能量色散型X荧光分析仪,采用MCNP4C程序,建立与实际相符的几何模型,模拟了不同入射角和出射角时的X荧光计数率,得到了X光管与样品、探测器与样品之间的最佳角度.所得结果与文献资料进行比较,其结果符合得很好.%X - ray fluorescence count rate have closed relationship with species and the content of analyte when EDXRF analysis. However, another X- ray fluorescence count rate have related the number of factors, including X- ray tube, sample and detector geometric relationships is an important influencing factors. In order to designing a better count rate of energy dispersive X- fluorescence analyzer, it apply MCNP4C procedures, we set up the geometric model which is in line with the actual to simulate X -fluorescence the counting rate when the different angle of incidence and emergence angle, obtained X - ray tube and sample , between the detector and sample the best angle. The results were compared with the literature, the results are in good agreement.
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