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首页> 外文期刊>Journal of Analytical Atomic Spectrometry >FPM model calculation for micro X-ray fluorescence confocal imaging using synchrotron radiation
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FPM model calculation for micro X-ray fluorescence confocal imaging using synchrotron radiation

机译：使用同步加速器辐射进行微X射线荧光共聚焦成像的FPM模型计算

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摘要

A novel quantitative reconstruction model for synchrotron-based confocal X-ray fluorescence imaging has been developed and validated. The theoretical approach uses a new generalized system of equations of the Fundamental Parameter Method (FPM) to calculate the 2D distribution of the concentration values of the trace, minor, and major elements. For the reconstruction procedure of the 2D quantitative μXRF calculations, a serial-type specialised iterative algorithm was developed based on successive approximation of the elementary composition of each individual voxel in the sample. This procedure is capable of neglecting serious numerical difficulty arising at the simultaneous-approaching solution of the huge number of variables involved in the non-linear FPM equations. The model describes the absorption of the primary and secondary X-ray beams in the sample volume and the photoelectric excitation process of characteristic X-ray emission in each sample voxel. For validation of this new evaluation method, standard samples were measured using monoenergetic synchrotron radiation at beamline L in HASYLAB.
机译：已经开发并验证了基于同步加速器的共焦X射线荧光成像的新型定量重建模型。该理论方法使用基本参数方法（FPM）的新的广义方程组来计算痕量元素，次要元素和主要元素的浓度值的2D分布。对于2D定量μXRF计算的重建程序，基于样品中每个个体素的基本成分的逐次逼近，开发了一种串行类型的专用迭代算法。此过程能够忽略在非线性FPM方程中涉及的大量变量同时逼近解时出现的严重数值困难。该模型描述了样品体积中主X射线束和次X射线束的吸收以及每个样品体素中特征X射线发射的光电激发过程。为了验证这种新的评估方法，在HASYLAB的光束线L处使用单能同步加速器辐射对标准样品进行了测量。

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  • 来源
    《Journal of Analytical Atomic Spectrometry》 |2017年第2期|334-344|共11页
  • 作者

    I. Szaloki; A. Gerenyi; G. Radocz; A. Lovas; B. De Samber; L. Vincze;

  • 作者单位

    Institute of Nuclear Techniques, Budapest University of Technology and Economics, Hungary;

    Institute of Nuclear Techniques, Budapest University of Technology and Economics, Hungary;

    Institute of Nuclear Techniques, Budapest University of Technology and Economics, Hungary;

    Institute of Nuclear Techniques, Budapest University of Technology and Economics, Hungary;

    Department of Analytical Chemistry, Ghent University, 9000 Ghent, Belgium;

    Department of Analytical Chemistry, Ghent University, 9000 Ghent, Belgium;

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