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- W188258210 abstract "Thesis (Ph. D.). The measuring equipment used especially in energy- dispersive x-ray fluorescence is described (i.e., the semiconductor detectors and the amplification and analyzing apparatus). Some important properties of the Si(Li) and Ge(Li) detectors are discussed: the distance between crystal surface and beryllium window, the absolute detection efficiency and the resolution in the low-energy region. The resolution (in eV at FWHM) is 280 eV for the Fe K alpha radiation (6.40 keV) with the silicon detector and 230 eV with the germanium detector. Two different radioactive sources are used as primary excitation sources: /sup 241/Am and /sup 170/Tm. Much attention was paid to the optimization of the geometrical arrangement of source, sample, and detector, because the mutual position of these three components will influence the sensitivity and the signal-to-background ratio. A few applications in the energy dispersive x-ray fluorescence field are described. Determination of rare earths in mixtures of rare eanths is confronted with the absorption and enhancement effect, so that a few correction methods were checked. Impurities in pure rare earths were determined by means of the standard addition method. A few synthetic rare-eanth mixtures with Nd as major component were analyzed by comparison with a standard sample. (auth)" @default.
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- W188258210 date "1973-01-01" @default.
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- W188258210 title "Energy-dispersive x-ray fluorescence analysis with radioisotope excitation" @default.
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