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The Excitation of Low Z Elements by Means of a Cylindrical Graded Multilayer as a High Energy Cut-Off in Edxrf Analysis

Published online by Cambridge University Press:  06 March 2019

B. Kanngießer  and
B. Beckhoff
B. Kanngießer
Affiliation:
University of Bremen, Department of Physics, NW1 /KufsteinerStraBe 28334 Bremen, Germany
B. Beckhoff
Affiliation:
University of Bremen, Department of Physics, NW1 /KufsteinerStraBe 28334 Bremen, Germany
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Abstract

To measure X-ray fluorescence radiation of low Z elements especially requires a very high excitation intensity with an energy as close as possible to the absorption edges. Furthermore, a monochromatization of the excitation radiation and a cut-off of higher energies is desirable in order to reduce the background in the spectral region of interest.

A cylindrical graded multilayer was designed and tested to concentrate and to monochromatize the radiation of a thin window Mo fine focus tube. The variation of the dspacing is tuned to reflect the Mo La-radiation of the fine focus tube. The physical dimensions of the cylindrical shape are optimized for concentrating the Mo La tube radiation onto the specimen with a spot size of about 3 mm. This corresponds to the size of the specimens from a time dependent personal aerosol sampler used.

The multilayer is characterized with respect to its reflecting, focusing, and monochromatizing properties. Two examples of low Z element analysis are given.

Type
Research Article
Information
Advances in X-Ray Analysis , Volume 39: Forty-Fourth Annual Conference on Applications of X-ray Analysis, July 31 - August 4, 1995 , 1995 , pp. 119 - 126
Copyright
Copyright © International Centre for Diffraction Data 1995

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References

[1] KanngieBer, B., Beckhoff, B., Scheer, J., Swoboda, W., and Laursen, J., The Use of Multilayer Structures in the Energy Dispersive X-Ray Fluorescence Analysis of Low Z Elements, Advances in X-Ray Analysis, vol 37 (1994), p. 535.Google Scholar
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