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  • 1990-1994  (4)
  • 1
    Electronic Resource
    Electronic Resource
    Trace element XRF analysis of Mongolian coals (1994)
    Springer
    Journal of radioanalytical and nuclear chemistry 185 (1994), S. 27-34 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract X-ray fluorescence has been applied as an analytical technique for the trace element characterization of Mongolian coals. Coal, samples from five regions of Mongolia are found to contain variable amounts of many trace elements. Various approaches to quantitative XRF analysis including a simple quantitative method, an emission-transmission method and a full fundamental parameter method are compared.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02042949
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Review of recent applications of radioisotope excited x-ray fluorescencePresented as an invited lecture at the European Conference on EDXRS, Myconos, Greece, 30 May-6 June 1992. (1993)
    New York, NY [u.a.] : Wiley-Blackwell
    X-Ray Spectrometry 22 (1993), S. 199-207 
    Details
    ISSN: 0049-8246
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: Radioisotop-excited x-ray fluorescence is advantageously applied to many specific analytical problems. It is a method of choice for in situ and on-line analysis. There is a growing need for in vivo determinations of many elements; radioisotope excitation offers some interesting possibilities. In addition to a review of published applications, current XRF activities in IAEA Laboratories are briefly described.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/xrs.1300220407
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Applicability of annular-source excited systems in quantitative XRF analysis (1994)
    New York, NY [u.a.] : Wiley-Blackwell
    X-Ray Spectrometry 23 (1994), S. 65-70 
    Details
    ISSN: 0049-8246
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: Radioisotope-excited XRF systems, using annular sources, are widely used in view of their simplicity, wide availability, relatively low price for the complete system and good overall performance with respect to accuracy and detection limits. However, some problems arise when the use of fundamental-parameter techniques for quantitative analysis is attempted. These problems are due to the fact that the systems operate with large solid angles for incoming and emerging radiation, and both the incident and take-off angles are not trivial. In this paper, an improved way to calculate ‘effective’ values for the incident and take-off angles, using Monte Carlo (MC) integration techniques, is shown. In addition, a study of the applicability of the ‘;effective’ angles for analysing different samples, or standards, was carried out. The MC method allows also calculation of the excitation-detection efficiency for different parts of the sample and estimation of the overall efficiency of a source-excited XRF set-up. The former information is useful in the design of optimized XRF set-ups and prediction of the response of inhomogeneous samples. A study of the sensitivity of the results due to sample characteristics and a comparison of the results with experimentally determined values for incident and take-off angles is also presented. A flexible and user-friendly computer program was developed in order to perform efficiently the lengthy calculations involved.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/xrs.1300230205
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    IAEA Programme of natural matrix reference materials for the determination of radionuclides (1993)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 345 (1993), S. 169-173 
    Details
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary The International Atomic Energy Agency has been providing analytical quality control services (AQCS) to its Member States since the 1960's. The AQCS programme distributes reference materials (RMs), organizes intercomparison runs, and provides training courses for quality assurance in chemical analysis and radioactivity measurements of food, biological, environmental and marine materials. This paper focusses on those aspects of the subject dealing with reference materials and intercomparison runs for the determination of radionuclides. Nineteen natural matrix reference materials are available for the determination of radionuclides. Twelve new intercomparison and reference materials are in preparation or under consideration. The radionuclides of interest include: K-40, Mn-54, Co-60, Sr-90, Tc-99, Ru-106, Ba-133, Cs-134, Cs-137, Pb-210, Ra-226, Th-228, Th-232, Pu-238, Pu-239+240.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00322582
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    Paper (German National Licenses)
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