PIXE-INP COMPUTER CODE FOR PIXE ANALYSES OF THIN AND THICK SAMPLES

The Pascal 6.0 program package PIXE-INP was developed at Institute of Nuclear Physics (Academy of Sciences of Czech Republic) for quantitati ve evaluation of PIXE spectra from thin and thick samples. The K-, L- and M-sensitivities are calculated using semi-empirical and theoretica l ionization cross sections, tabulated relative X-ray emission probabi lities, Coster-Kronig and fluorescence yields. The X-ray detector effi ciency is determined by measuring a set of thin standards with known e lement content. The package is supplemented with the data bases on X-r ay attenuation coefficients and proton stopping powers which are neede d for the calculation of thick sample matrix corrections. The X-ray sp ectrum evaluation comprises an iterative background removal and non-li near least squares fitting of X-ray multiplets with Gaussian peak shap e. The escape and summation peaks are taken into account. The performa nce of the program package is documented on measurements of reference materials.