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Applications of a Laboratory X-ray Micropsobe to Materials Analysis

  • D. A. Carpenter (a1), M. A. Taylor (a1) and C. E. Holcombe (a1)

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A laboratory-based X-ray microprobe, composed of a high-brilliance microfocus X-ray tube, coupled with a small glass capillary, has been developed for materials applications. Because of total external reflectance of X rays from the smooth inside bore of the glass capillary, the microprobe has a high sensitivity as well as a high spatial resolution. The use of X rays to excite elemental fluorescence offers the advantages of good peak-to-background, the ability to operate in air, and minimal specimen preparation. In addition, the development of laboratory-based instrumentation has been of Interest recently because of greater accessibility when compared with synchrotron X-ray microprobes.

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1. Sparks, C.J. Jr. , “X-Ray Fluorescence Microprobe for Chemical Analysis,” in: Synchrotron Radiation Research, Winich, H. and Doniach, S., Eds. , Plenum Press, New York, 1980
2. Nichols, M.C., Boehm, D.R., Ryon, R.W., Wherry, D., Cross, B., Aden, G., “Parameters Affecting X-Ray Microfluorescence (XRMP) Analysis,” in: Advances in X-Ray Analysis, vol. 30, Barrett, C.S. et al. , Eds. , Plenum Press, New York, 1987.
3. Wherry, D. and Cross, B., “XRF, Microbeam Analysis, and Digital Imageing Combined into a Powerful New Technique,” Analyst. 37: 8 (1986).
4. Giaque, R.D., Thompson, A.C., Underwood, J.H., Wu, Y., Jones, K.W., and Rivers, M.L., “Measurements of Femtogram Quantities of Trace Elements Using an X-Ray Microprobe,” Anal. Chem. 60:855 (1988).
5. Carpenter, D.A., “An Improved Laboratory X-Ray Source for Microfluorecence Analysis,” submitted for publication.
6. Hirsch, P.B., “X-Ray Microbeam Techniques,” in: X-Ray Diffraction by Polycrystalline Materials,” Peiser, H.S. et al. , Eds. , Chapman and Hall, London, 1960.

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