ISSN:
0049-8246
Keywords:
Chemistry
;
Analytical Chemistry and Spectroscopy
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Physics
Notes:
Stephenson's CORSET method has been adapted and expanded to the newer energy-dispersive method to take advantage of its ability simultaneously to detect all elements (Z 〉 10) present (anticipated or not). Parameters such as the mass absorption coefficients and energies of absorption edges and emission lines of all elements are calculated as in Myklebust and Heinrich's FRAME program. The X-ray intensities of pure elements versus atomic number of the elements for a given line (Kα or Lα) forms smooth curves as reported by Blum and Brandt. Because of the exceptional stability of energy-dispersive methods (no moving parts, long tube life, etc.) and known overall spectrometer efficiency of these systems, they can be ‘standardized’ at installation by measuring (for a given tube, voltage and specimen holder configuration) several pure intensities (e.g. 6-10 covering the periodic table). Stored, these constants allow the calculation of the effective pure element intensity and the original intensity of the most effective excitation energy for any element that may be encountered. For an unknown sample, the program integrates net peak intensities (stripping away spectrum background and peak overlaps) and converts them to percentages with an iterative calculation. The accuracies are not as good as can be achieved with appropriate multiple standards. The compensating advantages are speed, flexibility and convenience. The entire program runs on-line in a 16K, 16 bit minicomputer.
Additional Material:
3 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/xrs.1300060111
Permalink
