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Energy Dispersive X-Ray Fluorescence Spectrometry Using Pulsed X-Ray Excitation*

Published online by Cambridge University Press:  06 March 2019

J. M. Jaklevic ,
D. A. Landis  and
F. S. Goulding
J. M. Jaklevic
Affiliation:
Lawrence Berkeley Laboratory, University of California Berkeley, California 94720
D. A. Landis
Affiliation:
Lawrence Berkeley Laboratory, University of California Berkeley, California 94720
F. S. Goulding
Affiliation:
Lawrence Berkeley Laboratory, University of California Berkeley, California 94720
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Abstract

An energy dispersive X-ray fluorescence spectrometer using pulsed X-ray excitation has been developed for use in large-scale environmental analysis programs. A grid controlled X-ray tube is coupled with variable secondary fluorescence targets to analyze for a wide variety of elements with almost optimum sensitivity. The operation of the pulsed tube in a feedback loop with the semiconductor detector spectrometer results in a substantial increase in output counting rates without pile-up. The loop functions by turning off the excitation immediately upon detection of an event by the spectrometer. Pileup events are virtually eliminated and the X-ray tube's available anode power is better utilized.

The electronic control of this feedback mode results in some unique features in the response of the system to varying sample mass. These features are discussed in detail. Experimental results for sensitivity and accuracy over the range of elements measured are presented. Early operating experience with the unit indicates increases of counting rates of a factor of five compared with similar conventional systems.

Type
X-Ray Fluorescence Phenomena and Application
Information
Advances in X-Ray Analysis , Volume 19: Twenty-Fourth Annual Conference on Applications of X-ray Analysis, August 6-8, 1975 , 1975 , pp. 253 - 265
Copyright
Copyright © International Centre for Diffraction Data 1975

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Footnotes

*

This work was performed under an Interagency Agreement between the Environmental Protection Agency and the U. S. Energy Research and Development Administration.

References

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