Analysis of X‐ray spectra by iterative least squares (AXIL): New developments

The functionality of the computer package AXIL (Analysis of X-ray spectra by Iterative Least squares), suitable for the evaluation of energy-dispersive X-ray spectra, has been extended in a number of ways. First, a background modelling algorithm, based on the use of mutually orthogonal polynomials was introduced to replace the linear or exponential polynomials employed previously. Second, the Gaussian photopeak model employed in previous versions of the program was extended to include the non-Gaussian parts of the characteristic peaks and related background contributions. Both innovations are shown to improve the performance of the spectrum evaluation procedure. Third, the user-friendliness of the evaluation program was enhanced (a) by allowing a PC plug-in MCA card to be directly controlled from within the program and (b) by extending the command-interface to allow for repeated execution of series of commands by means of control loops. A brief description of these changes is given; as an application, the accurate evaluation of micro-XRF images is discussed.

[1]  J. Campbell,et al.  Lorentzian contributions to x‐ray lineshapes in Si(Li) spectroscopy , 1992 .

[2]  D. R. Cousens,et al.  SNIP, A STATISTICS-SENSITIVE BACKGROUND TREATMENT FOR THE QUANTITATIVE-ANALYSIS OF PIXE SPECTRA IN GEOSCIENCE APPLICATIONS , 1988 .

[3]  B. Millman,et al.  Analytic fitting of monoenergetic peaks from Si(Li) X-ray spectrometers , 1985 .

[4]  Freddy C. Adams,et al.  A general Monte Carlo simulation of energy-dispersive X-ray fluorescence spectrometers—I: Unpolarized radiation, homogeneous samples , 1993 .

[5]  S. Steenstrup,et al.  A simple procedure for fitting a backgound to a certain class of measured spectra , 1981 .

[6]  E. Clayton,et al.  A discussion of PIXAN and PIXANPC: The AAEC PIXE analysis computer packages , 1987 .

[7]  F. Adams,et al.  A method for the accurate description of the full-energy peaks in non-linear least-squares analysis of x-ray spectra , 1977 .

[8]  Koen Janssens,et al.  AXIL-PC: software for the analysis of complex X-ray spectra , 1986 .

[9]  G. W. Phillips,et al.  Automatic analysis of gamma-ray spectra from germanium detectors , 1976 .

[10]  Freddy C. Adams,et al.  Linear and non‐linear peak fitting in energy‐dispersive X‐ray fluorescence , 1979 .

[11]  L. Vincze,et al.  Monte Carlo simulation of conventional and synchrotron energy‐dispersive x‐ray spectrometers , 1993 .

[12]  P. R. Bevington,et al.  Data Reduction and Error Analysis for the Physical Sciences , 1969 .

[13]  P. Espen,et al.  General approach for quantitative energy dispersive x-ray fluorescence analysis based on fundamental parameters , 1991 .

[14]  Pierre J. Van Espen,et al.  An integrated system for quantitative EDXRF analysis based on fundamental parameters , 1990 .

[15]  Freddy C. Adams,et al.  A computer analysis of X-ray fluorescence spectra , 1977 .