Abstract

A fortran computer code has been written to perform standard-free analysis of PIXE spectra. The analysis is broken into three components: relative X-ray intensity calculation, detector calibration, and spectrum deconvolution. Nonlinear portions of the problem are limited to detector calibration. Actual spectrum deconvolution is performed as a linear least squares problem with linear inequality constraints on element concentrations and background. Up to 9 K and 15 L lines of 85 elements are available for spectrum fitting. The current model consists of Gaussian peaks and a polynomial background. Development work is underway to add low energy tails to the peak model and absorption edges to the background.

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