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Improved X-Ray Fluorescence Capabilities by Excitation with High Intensity Polarized X-Rays*

Published online by Cambridge University Press:  06 March 2019

Richard W. Ryon  and
John D. Zahrt
Richard W. Ryon
Affiliation:
Lawrence Livermore Laboratory P. O. Box 808, L-325, Livermore, California 94550
John D. Zahrt
Affiliation:
Lawrence Livermore Laboratory P. O. Box 808, L-325, Livermore, California 94550
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Extract

Energy dispersive x-ray fluorescence is an established and versatile tool for measuring major and trace elements in virtually any kind of solid or liquid specimen. The usefulness of the method could he extended even further if the time of analysis for multicomponent samples could he reduced. In other words, we desire to analyze a wide range of elements with detection limits at least as good as obtained when the excitation conditions are optimized for a specific element or narrow range of elements. A major impediment to achieving this goal when analyzing bulk, low-Z materials is the scatter of source radiation into the detector by the specimen being analyzed. The adverse effects of the scattered radiation are its contribution to the background signal (i.e., “noise“) and its overwhelming contribution to the limited counting rate of the system electronics.

Type
Research Article
Information
Advances in X-Ray Analysis , Volume 22: Twenty-Seventh Annual Conference on Applications of X-ray Analysis, August 1-4, 1978 , 1978 , pp. 453 - 460
Copyright
Copyright © International Centre for Diffraction Data 1978

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Footnotes

**

Present address: Northern Arizona University, Dept, of Chemistry Box 5698, Flagstaff, Arizona 86011

*

Work performed under the auspices of the U.S. Department of Energy by the Lawrence Livermore Laboratory under contract number W-7405-ENG-48.

References

1. Ryon, R. W., “Polarized Radiation Produced by Scatter for Energy Dispersive X-Ray Fluorescence Trace Analysis,” in McMurdis, H. F., et al, Eds., Advances in X∼Ray Analysis, Vol 20, p. 575–590, Plenum Press (1977).Google Scholar
2. Sahrt, J. D. and Ryon, R. W., “Scatter Efficiencies for Polarized X-Ray Sources,” to “be published.Google Scholar
3. Howell, R. H., Pickles, W. L. and. Cate, J. L. Jr., “X-Ray Fluorescence Experiments with Polarized X-Rays,” in Pickles, W. H., et al, Eds., Advances in X-Ray Analysis,” Vol. 18, p. 265–277, Plenum Press (1974).Google Scholar
4. Aiginger, H., Wohrauschek, P., and Brauner, C., “Energy Dispersive Fluorescence analysis Using Bragg-Reflected Polarized X-Rays,” Measurement, detection, and Control of Environmental Pollutants, International Atomic Energy Act, Vienna, 1976, pp. 197–212.Google Scholar