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X-Ray Microprobe Studies Using Multilayer Focussing Optics

Published online by Cambridge University Press:  06 March 2019

A.C. Thompson
Affiliation:
Lawrence Berkeley Laboratory, Berkeley, CA 94720
J.H. Underwood
Affiliation:
Lawrence Berkeley Laboratory, Berkeley, CA 94720
Y. Wu
Affiliation:
Lawrence Berkeley Laboratory, Berkeley, CA 94720
R.D. Giauque
Affiliation:
Lawrence Berkeley Laboratory, Berkeley, CA 94720
M.L. Rivers
Affiliation:
University of Chicago, Chicago, IL 60637
R. Futernick
Affiliation:
Fine Arts Museum, San Francisco, CA 94121
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Extract

The availability of intense x-rays from synchrotron radiation sources permits the elemental analysis of samples in new ways. An x-ray microprobs using these sources allows the analysis of much smaller samples with greatly improved elemental sensitivity. In addition to the higher x-ray intensity obtained at synchrotron sources, the development of high efficiency x-ray reflectors using multilayer coated optical mirrors permits the achievement of spot sizes of less than 10 μm x 10 μm with enough x-ray intensity to simultaneously measure femtogram quantities of many elements in less than one minute. Since samples to be studied in an x-ray microprobe do not have to be placed in a vacuum, almost any sample can be conveniently analyzed. With an x-ray microprobe it is possible to obtain elemental distributions of elements in one, two or even three dimensions.

Type
IV. Techniques and XRF Instrumentation
Copyright
Copyright © International Centre for Diffraction Data 1988

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References

1. Sparks, C.J. Jr. , X-ray Fluorescence Microprobe for Chemical Analysis, in: “Synchrotron Radiation Research”, Winick, H. and Doniach, S., ed. , Plenum Press, New York(l980).Google Scholar
2. Thompson, A.C., Underwood, J.H., Wu, Y., Giauque, R.D., Jones, K.W. and Rivers, M.L., Elemental Measurements With an X-Ray Microprobe of Biological and Geological Samples With Femtogram Sensitivity, Nucl. Instr. and Meth. A226:318 (1987).Google Scholar
3. Underwood, J.H., Thompson, A.C., Wu, Y. and Giauque, R.D., X-Ray Microprobe Using Multilayer Mirrors, Nucl. Instr. and Meth. A226: 296 (1987) ,Google Scholar
4. Giauque, R.D., Thompson, A.C., Underwood, J.H., Wu, Y., Jones, K.W. and Rivers, M.L., Measurement of Femtogram Quantities of Trace Elements Using an X-Ray Microprobe. Anal. Chem. 60:885 (1988).Google Scholar
5. Cahill, T.A. et al. , The Vinland Map, Revisited: New Compositional Evidence on Its Inks and Parchment, Anal. Chem., 59: 829 (1987).CrossRefGoogle Scholar
6. McCrone, W.C.. The Vinland Map. Anal. Chem. 60: 1009 (1988).CrossRefGoogle Scholar

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