Combination of optimization algorithm and pure-element spectral stripping for the unfolding method of energy dispersive X-ray fluorescence spectrometry
LIU Ming-bo1, 2, LIAO Xue-liang1, HU Xue-qiang1, HAN Bing1, SHEN Xue-jing1, 2, WANG Hai-zhou1, 2
1. NCS Testing Technology Co., Ltd., Beijing 100081, China; 2. Central Iron and Steel Research Institute, Beijing 100081, China
Abstract：During the unfolding of energy dispersive X-ray fluorescence spectrometry (EDXRF), the method of pure-element spectral stripping will be more reasonable if the composition of sample is given. However, if there are two or more spectral lines for each element, the serious distortion of determination results will be caused if the stripping is conducted by only aligning the main line. Moreover, the stripping sequence will also have great influence on the unfolding results. A kind of unfolding method for EDXRF by combining optimization algorithm and pure-element spectral stripping was introduced. The intensity of every pure-element spectrum and number of peak shift were selected as variables to establish the residual equation. Then the equation was adjusted using optimization algorithm until the residue was minimal. The L-series spectral lines of La-Ce-Pr-Nd solution mixture with serious spectral overlapping were unfolded by three methods, i.e., stripping in intensity sequence, stripping in energy sequence, and fitting by optimization algorithm. The results showed that the residual error (σ) between original spectrum and spectrum obtained by optimization algorithm (1415.0) was much lower than other two methods (166094.0 and 3192.7). The fitted spectrum was more consistent with the original spectrum. Moreover, this method was insensitive to the initial parameters, and the precision was not depended on the stripping sequence.
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LIU Ming-bo, LIAO Xue-liang, HU Xue-qiang, HAN Bing, SHEN Xue-jing, WANG Hai-zhou. Combination of optimization algorithm and pure-element spectral stripping for the unfolding method of energy dispersive X-ray fluorescence spectrometry. , 2019, 39(8): 19-22.
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