X-ray scattering in X-ray fluorescence spectra with X-ray tube excitation - Modelling, experiment, and Monte-Carlo simulation |
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Authors: | V-D Hodoroaba M Radtke V Rackwitz |
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Affiliation: | a BAM Federal Institute for Materials Research and Testing, Division VI.4 Surface Technologies, D-12200 Berlin, Germany b BAM Federal Institute for Materials Research and Testing, Division I.3 Structure Analysis; Polymer Analysis, D-12200 Berlin, Germany c Ghent University, Department of Analytical Chemistry, B-9000 Ghent, Belgium |
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Abstract: | X-ray scattering may contribute significantly to the spectral background of X-ray fluorescence (XRF) spectra. Based on metrological measurements carried out with a scanning electron microscope (SEM) having attached a well characterised X-ray source (polychromatic X-ray tube) and a calibrated energy dispersive X-ray spectrometer (EDS) the accuracy of a physical model for X-ray scattering is systematically evaluated for representative samples. The knowledge of the X-ray spectrometer efficiency, but also of the spectrometer response functions makes it possible to define a physical spectral background of XRF spectra. Background subtraction relying on purely mathematical procedures is state-of-the-art. The results produced by the analytical model are at least as reliable as those obtained by Monte-Carlo simulations, even without considering the very challenging contribution of multiple scattering. Special attention has been paid to Compton broadening. Relevant applications of the implementation of the analytical model presented in this paper are the prediction of the limits of detection for particular cases or the determination of the transmission of X-ray polycapillary lenses. |
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Keywords: | X-ray scattering X-ray fluorescence Spectral background Modelling Monte-Carlo simulation |
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