Abstract
The computer processing of spectral data is one of the principal limiting factors of accuracy attainable in PIXE analysis of elements with overlapping peaks. The interference of Ba L with Ti K lines is chosen as a model system for such cases of overlaps. In a preliminary study of the influence of varying mass ratios of both elements on the accuracy of their determination with PIXE, unacceptably high inaccuracies of 40% are found when the Ba/Ti mass ratio in the samples is about 3 × 10 −2. A new set of standards is prepared, consisting of composite layers of Ti and BaCl 2 with different masses per unit area, evaporated onto vitreous carbon. The very careful characterization of these standards, following the principle of traceability for the absolute values of areal density and assessing the inhomogeneities of the layers, is described. After a full evaluation of the homogeneity tests these standards will be made available.
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