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  • Analytical Chemistry and Spectroscopy  (6)
  • NUCLEAR REACTIONS Li^7(n, t)He^4+n, E = 14.4 MeV  (1)
Source
Material
Years
Keywords
  • 1
    Electronic Resource
    Electronic Resource
    Triton spectrum from the n+Li^7 reaction
    Amsterdam : Elsevier
    Nuclear Physics 60 (1964), S. 581-587 
    Details
    ISSN: 0029-5582
    Keywords: NUCLEAR REACTIONS Li^7(n, t)He^4+n, E = 14.4 MeV ; measured α(E"t). Enriched target
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0029-5582(64)90094-X
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    A general way of solving matrix effect problems in elemental analysis by EDXRFS (1988)
    New York, NY [u.a.] : Wiley-Blackwell
    X-Ray Spectrometry 17 (1988), S. 139-143 
    Details
    ISSN: 0049-8246
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: Instead of using the complete set of fundamental parameters for solving matrix effects in quantitative energy-dispersive x-ray fluorescence (EDXRF) analysis, some of them, such as excitation and detection efficiency and the dependence of Compton and Rayleigh scattered intensities on sample composition, were determined from a set of standards such as chemical compounds and pure elements. In this way all fundamental parameters except mass absorption coefficients were removed from the calculation procedure, which results in a much simpler formalism. The computer program COREX based on this principle and described in this paper is relatively simple and can run even on small microcomputers, while the overall error can be kept in the range of a few percent if the calibration procedure and sample preparation were performed carefully.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/xrs.1300170405
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    Paper (German National Licenses)
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  • 3
    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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  • 4
    Electronic Resource
    Electronic Resource
    Evaluation of interelement coefficients by the fundamental parameter method in alloy analysis by XRF (1985)
    New York, NY [u.a.] : Wiley-Blackwell
    X-Ray Spectrometry 14 (1985), S. 50-52 
    Details
    ISSN: 0049-8246
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: A method for the calculation of interelement ‘empirical’ coefficients through the fundamental parameters method has been developed. The results of standard alloy analyses obtained in this way confirm the validity of this approach.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/xrs.1300140203
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    A modified approach to the quantitative XRF analysis of thick targets (1987)
    New York, NY [u.a.] : Wiley-Blackwell
    X-Ray Spectrometry 16 (1987), S. 125-130 
    Details
    ISSN: 0049-8246
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: The widely used formalism for quantitative XRF analysis based on the correction of characteristic line intensity for absorption effects is shown to be inadequate when thick samples with low total mass attenuation coefficients are analysed (biological samples, solutions, etc.). The geometry factor is not a constant function of the collimator's shape and dimensions, but it is found that in an analysed matrix it depends on the line energy and penetration depth. An experimental and a theoretical model for the determination of the geometrical correction are proposed and tested on a set of samples. The concentrations obtained are in excellent agreement with the values expected, whereas the model based on the correction of intensities only for absorption effects gives an error of at least 25% for thick samples.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/xrs.1300160307
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Analysis of trace elements in hair of pregnant women using XRF spectrometry (1989)
    New York, NY [u.a.] : Wiley-Blackwell
    X-Ray Spectrometry 18 (1989), S. 73-76 
    Details
    ISSN: 0049-8246
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: It was shown that x-ray fluorescence is very suitable for following changes in trace element concentrations in the hair of pregnant women. Two hundred hair samples were analysed, mean concentrations for Cr, Mn, Fe, Cu and Zn were evaluated quarterly and their distribution according to weeks of pregnancy was determined. Possibilities of using longitudinal hair analysis with the purpose of following the concentrations of some particular microelements in the course of pregnancy are discussed.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/xrs.1300180208
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    Paper (German National Licenses)
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  • 7
    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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