An Evaluation of the Rasberry-Heinrich Model for the Analysis of Silicate Rocks

Abstract

The Rasberry-Heinrich model for correcting for absorption and secondary fluorescence effects is evaluated in the analysis of silicate rocks. The interelement effect of binary mixtures of the oxides of Na, Mg, Al, Si, K, Ca, Ti, Fe, and Mn is studied in a 1:11 fusion mixture with Li₂B₄O₇. Two binary systems are expected to exhibit secondary fluorescence effects and are reported in detail. The combination Fe₂O₃/TiO₂ shows a small secondary fluorescence, whereas the Al₂O₃/SiO₂ binary shows an absorption effect. The latter effect is attributed to the large absorption effect due to oxygen. The secondary fluorescence of its Fe₂O₃/TiO₂ system in a diluted matrix of Li₂B₄O₇ acts like a negative absorption rather than secondary fluorescence as described by the Rasberry-Heinrich model.

Keywords

X-ray fluorescence

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