Abstract
Abstract PIXE measurements have been performed on volcanic rocks, using external 3 MeV proton beams of 50 to 200 μm diameter, at the KN3000 Van de Graaff accelerator of the Physics Department of the Florence University. Two or more Si(Li) detectors are used during each run and the elemental composition is computed from the peak areas obtained in the different detectors with an absolute procedure whose reliability has been checked by analyzing several geological standards. In order to obtain solid-liquid partition coefficients of trace elements, the groundmass composition has been determined by directly bombarding standard polished rock sections mounted on a glass support.
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