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At present, X-ray fluorescence and electron probe analysis are suitable for all atomic numbers down to 11 (Na). Precision for major constituents is about 1 per cent of the amount present for X-ray fluorescence but 3 to 5 per cent for electron probe analysis because of the relatively higher background. The limit of detectability is about 1 ppm or 10−8 g for X-ray fluorescence and about 100 ppm or 10−14 g for the electron probe. A number of improvements are likely in the near future that will extend the present limit considerably. These include: (1) measurement of the elements from boron to fluorine, (2) specimen pretreatment by techniques especially designed for X-ray analysis rather than wet chemistry, (3) selective excitation and detection of X-rays from only a few desired elements in a complex specimen, and (4) use of high-speed computers with suitably designed mathematics to eliminate the requirement for known comparison standards in quantitative analysis.
Birks, L. S.
U.S. Naval Research Laboratory, Washington, D. C.,