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 Li<sub>2</sub>B<sub>4</sub>O<sub>7</sub>. Two binary systems are expected to exhibit secondary fluorescence effects and are reported in detail. The combination Fe<sub>2</sub>O<sub>3</sub>/TiO<sub>2</sub> shows a small secondary fluorescence, whereas the Al<sub>2</sub>O<sub>3</sub>/SiO<sub>2</sub> binary shows an absorption effect. The latter effect is attributed to the large absorption effect due to oxygen. The secondary fluorescence of its Fe<sub>2</sub>O<sub>3</sub>/TiO<sub>2</sub> system in a diluted matrix of Li<sub>2</sub>B<sub>4</sub>O<sub>7</sub> acts like a negative absorption rather than secondary fluorescence as described by the Rasberry-Heinrich model.
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