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Comparison of Various X-ray Tube Types for XRF Analysis

Published online by Cambridge University Press:  06 March 2019

Y. M. Gurvich
Y. M. Gurvich*
Affiliation:
Applied Research Laboratories 9545 Wentworth Street Sunland, CA 19040
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Extract

In XRF wavelength dispersive sequential spectrometers, two general types of X-ray tubes are employed: end-window and side-window. In the side-window design, anode and window are grounded. This allows a large portion of high energy electrons, scattered from the target, to fall on and heat the window. The heating, which results in the loss of window strength, requires increased window thickness and shortens an X-ray tube's life cycle.

In end-window tubes, potential is reversed: cathode and window are grounded while the anode operates at a high potential. Scattered electrons are attracted back to the anode with very few striking the window. The window does not suffer from heating, and its thickness can be decreased to 125 microns. Such a window is transparent to soft radiation, which is beneficial when exciting light elements.

Type
III. New Techniques and Instrumentation in XRF
Information
Advances in X-Ray Analysis , Volume 28: Thirty-Third Annual Conference on Applications of X-ray Analysis, July 30 - August 3, 1984 , 1984 , pp. 113 - 118
Copyright
Copyright © International Centre for Diffraction Data 1984

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References

1. Gilfrich, J.V., Burkhalter, P.G., Whitlock, R.R., Warden, E.S., Birks, L.S., “Spectral Distribution of a Thin Window Rh Target X-Ray Spectrographic Tube”, Analytical Chemistry, 43 (1971), p 934. Google Scholar
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