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One of the major problems of analysis in the soft x-ray region is the limitation due to low transmission of the window materials of sealed-off x-ray detectors. This paper describes the properties and use of a gas-flow proportional counter system for the x-ray analysis of elements in the third period of the periodic table, with special reference to aluminum and silicon. The use of gases flowing continuously through the counter at atmospheric pressure in conjunction with helium also at atmospheric pressure in the optical path permits the use of ultra-thin nonvacuum-tight windows with high transmission in this region. Comparative data, obtained on a Norelco fluorescence spectrometer, show a tenfold increase in counting efficiency for AlKα over detectors previously available for this application.
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Hendee et al. (1956) studied this question.
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