原位能量色散X射线荧光分析中岩样基体效应及其修正研究

发布时间：2018-06-14 17:24

本文选题：蒙特卡罗模拟 + 原位能量色散X射线荧光分析　；参考：《光谱学与光谱分析》2017年03期

【摘要】：原位能量色散X射线荧光现场分析岩样矿物成分时,岩样基体效应会对测量结果产生影响。本文以Cu元素作为待测元素,研究了17种不同岩样基体对原位能量色散X射线荧光分析Cu元素特征X射线强度的影响及其修正方法。采用蒙特卡罗方法模拟获得了Cu元素含量相同的17种不同岩样测量谱线,综合各类岩石元素构成的相似性,并依据模拟谱线Cu元素Kα射线强度与谱线参数之间的相关性,反映了原位能量色散X射线荧光分析岩样Cu元素的基体效应并不完全受岩体元素构成或岩石分类的控制,需要依据岩石样分析谱线参数的相关性进行归类讨论。针对基体影响Cu元素特征射线强度相似的15种岩样进一步研究,并对Cu元素特征X射线与谱线主要参数的主成分进行分析,发现散射本底、X光管靶材料特征X射线及其非相干散射峰强度能够很好的描述Cu元素特征X射线强度受岩样基体影响的变化,据此可以对基体效应影响相似的岩体进行Cu元素测量结果修正。采用本文方法同样也能为不同岩性岩体其他待测元素基体效应的修正提供参考。
[Abstract]:In situ energy dispersive X-ray fluorescence field analysis of mineral composition of rock samples, the matrix effect of rock samples will have an impact on the measurement results. In this paper, the effect of 17 kinds of rock matrix on the X-ray intensity of Cu in situ energy dispersive X-ray fluorescence analysis is studied. Using Monte Carlo method, 17 different rock samples with the same Cu content were obtained. The similarity of the composition of each rock element was synthesized, and the correlation between K 伪 ray intensity of Cu element and spectral line parameters was simulated. The results show that the matrix effect of Cu element in situ energy dispersive X-ray fluorescence analysis is not completely controlled by the composition of rock mass elements or the classification of rock, so it needs to be classified and discussed according to the correlation of spectral parameters of rock sample analysis. In view of the 15 kinds of rock samples whose matrix affects the intensity of characteristic rays of Cu element, the principal components of the main parameters of the characteristic X-ray and spectral line of Cu element are analyzed, and 15 kinds of rock samples with similar intensity of characteristic rays of Cu element are further studied. It is found that the characteristic X-ray and the incoherent scattering peak intensity of the scattering background X ray target material can well describe the variation of the Cu element characteristic X ray intensity affected by the rock sample matrix. Based on this, the results of Cu measurement can be corrected for rock mass with similar matrix effect. The proposed method can also provide a reference for the correction of matrix effect of other elements to be tested in different rock masses.
【作者单位】：成都理工大学核技术与自动化工程学院;地学核技术四川省重点实验室;
【基金】：国家自然科学基金项目(41204090) 中国地质调查局项目(12120114075901)资助
【分类号】：P575;O657.34

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