An attempt at improving the accuracy of calculated relative intensities from theory in x-ray fluorescence spectrometry
✍ Scribed by G. Y. Tao; S. J. Zhuo; A. Ji; K. Norrish; P. Fazey; U. E. Senff
- Publisher
- John Wiley and Sons
- Year
- 1998
- Tongue
- English
- Weight
- 459 KB
- Volume
- 27
- Category
- Article
- ISSN
- 0049-8246
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✦ Synopsis
The e †ects of di †erent spectrometer geometries, x-ray tube spectral distributions and mass absorption coefficients (MACs) on relative intensities calculated from the theory have been investigated. In the comparison of calculated relative intensities with experimental data for eight analyte components and nine characteristic x-ray lines in a fusion sample system, four di †erent published mass absorption coefficient compilations were employed and three di †erent intensity calculation modes were used. It was observed that the most signiÐcant MAC di †erences (up to 46% relative) appeared between these MAC compilations, or between calculated and experimental MAC values when the lines under examination were located between the energy ranges of and or and absorp-L II L III , M IV M V tion edges of an absorber. This leads to large di †erences (up to 23% ) between calculated relative intensities when using the four di †erent MAC compilations. A mixed MAC compilation and a (l + s) calculation mode were proposed which led to better agreements between calculated and measured relative intensities on a series of synthetic standards. More accurate theoretical a-coefficients calculated from the theory and analytical results of the direct fundamental parameter method for the correction of inter-element e †ects would be expected when the accuracy of calculated relative intensities was improved.