Abstract
A computer program CLARA that calculates a correction factor for thick target PIXE analysis is described. Using CLARA, the analysis of a powdered sample diluted in a light matrix can be corrected for X-ray self-absorption and beam energy loss to use the regular thin film PIXE yields. Dilutions of powders in boric acid were simulated for two extreme cases: carbon and iron powders. In the first case, a 10% addition of carbon changed a pre-defined thick target correction factor, Ri, less than 5% for all elements. On the other hand, 10% of iron changed Ri to about 7% for elements with Z>21 but showed a 50% loss for the Al content. Using the same procedure, the analysis of Marine Sediment SRM IAEA-356 diluted to 1% in boric acid showed excellent agreement with the referenced data, although compromising somewhat the detection limits.
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