A simple method for background and matrix correction of spectral peaks in trace element determination by X‐ray fluorescence spectrometry
A simple method for background and matrix correction of spectral peaks in trace element determination by X‐ray fluorescence spectrometry
复制标题
X射线荧光光谱法测定微量元素中光谱峰背景和基质校正的简单方法
DOI：
10.1002/xrs.1300050110
复制
发表时间：
1976
期刊：
影响因子：
--
通讯作者：
J. P. Willis
中科院分区：
文献类型：
--
作者：
C. Feather;J. P. Willis
在相邻的主要元素吸收边之间，发现在不同波长位置处的背景强度线性相关。此外，任何位置处的背景强度与吸收边缘之间的任何波长的质量吸收系数的倒数线性相关。
这里提出的方法允许通过在无干扰的背景位置（其可以是康普顿散射“峰”）处的单次测量来确定背景以及质量吸收系数。如果质量吸收系数已知，则可以直接计算背景。
对地质材料的试验表明，虽然不像传统的背景测定方法那样精确，但由于只需要测量一个背景位置的强度，因此可以在节省大量时间的情况下获得2%至5%的相对精度。可以使用低色散高反射率分析晶体，例如LiF（200），因为不再需要在峰之间获得无干扰的背景位置。
此外，该方法非常适合于在能量色散系统的光谱分辨率是一个问题，并在多通道单元，其中只有一个通道需要用于确定质量吸收系数和背景的一组微量元素的背景强度的测定。
该方法已用于大量化探样品中微量元素的低成本测定。
Between adjacent major element absorption edges, background intensities at differing wavelength positions were found to be related linearly. Also, background intensity at any position is linearly related to the reciprocal of the mass absorption coefficient for any wavelength between the absorption edges.
The method presented here allows for the determination of background, as well as mass absorption coefficient, by a single measurement at an interference-free background position (which can be the Compton scatter ‘peak’). If the mass absorption coefficient is already known, backgrounds may be calculated directly.
Tests on geological materials show that, while not as accurate as conventional methods of background determination, relative accuracies of two to five percent are obtainable with a very considerable saving in time, since intensity at only one background position need be measured. Use of low dispersion high reflectivity analysing crystals, e.g. LiF(200), is possible because it is no longer necessary to attain interference-free background positions between peaks.
Furthermore, the method is ideally suited to the determination of background intensities in energy dispersive systems where spectral resolution is a problem and in multi-channel units where only one channel need be used for the determination of both mass absorption coefficient and backgrounds for a group of trace elements.
The method has been used in the low cost determination of trace elements in large numbers of geochemical prospecting samples.