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Optimal X-ray filters for EDXRF analysis

This work presents a semi-analytical approach to answer the question of optimal beam filtering in the case of EDXRF measurements with an X-ray tube. A collection of programs, called xfilter, is presented that is capable to find the optimal filter material and the optimal scattering angle for all possible combinations of trace elements and target materials. The tube voltage can be either set fixed or be another parameter to optimize. The concepts of the calculations are introduced in a general manner and demonstrated with a specific example, the detection of gold Kα 1 XRF within human tissue. The comparison between the calculation results and an EDXRF measurement shows excellent agreement.