Improvements to the fundamental parameter algorithm of x‐ray fluorescence analysis are considered. The algorithm involves the following effects: primary and secondary x‐ray absorption, secondary and tertiary fluorescence, excitation by scattered x‐rays, excitation by photoelectrons and excitation by the divergent primary beam. The algorithm allows one to calculate the spectral intensity of x‐ray tubes with both thick and electron transmission targets. A version of the algorithm that can be handled on a low‐capacity computer is proposed. The algorithm was tested experimentally on the analysis of rocks, but its algorithm may be applied to different substances and materials.
A procedure for the non-destructive x-ray fluorescence (XRF) spectrometric determination of major and some minor elements in soils, marine sediments and friable deposits is proposed. It does not require any preliminary treatment of the sample except for its drying at 105°C. The matrix correction procedure used is based on acoefficients which are simulated for maximum possible variations of interfering element concentrations in the matrix and are calculated on the assumption that the sample is homogeneous. The achieved agreement between the XRF results and the certified values is satisfactory. The paper discusses why the above material cannot be homogenized by fusion and the effect of this on the XRF results.
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