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  • 1
    Electronic Resource
    Electronic Resource
    Optimization of the Multiparameter γ-γ Coincidence Spectrometry for the Determination of Iridium in Geological Materials (2000)
    Springer
    Journal of radioanalytical and nuclear chemistry 244 (2000), S. 655-660 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract A new ICS system has recently been constructed at the University of Vienna. Using low-energy planar detectors and improved electronic components, the detection limit could be lowered to about ≤20 ng/g for carbonate rocks. As standards, either synthetic iridium standards loaded on high-purity quartz powder, or well characterized geological reference materials, were used. In a series of test measurements we attempted to optimize external factors, such as sample size, irradiation time and flux, decay time, and measuring time, and to determine the optimal electronic configuration, including shaping time, coincidence time, range, and gain. Further measurements are geared towards the establishment of a simple and effective routine procedure for a variety of rock types containing iridium at concentrations within the 0.02–1 ppb range.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1006754409429
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  • 2
    Electronic Resource
    Electronic Resource
    Use of γ-γ Coincidence Spectrometry in the Geochemical Study of Diamictites from South Africa (2000)
    Springer
    Journal of radioanalytical and nuclear chemistry 244 (2000), S. 603-607 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract We used γ-γ coincidence spectrometry to investigate the possible presence of a meteoritical component in 27 samples of South African diamictites. Recently, several studies have suggested that some tillites/diamictites may represent impact breccias, but a petrographical study by our group found no evidence for the presence of impact-characteristic shocked minerals. The siderophile elements, such as Cr, Co, Ni, and, especially, the platinum group elements, have high abundances in meteorites, but low abundances in terrestrial crustal rocks. The Ir content of the diamictites was measured with the new iridium coincidence spectrometer (ICS) at the University of Vienna, with detection limits of around 0.02 ppb. No enrichments in the contents of Ir and other siderophile elements compared to average crustal concentrations were found; thus, no unequivocal evidence for an impact origin of these diamictites of the South African Dwyka Group can be documented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1006717417181
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