Experimental validation of some thermal neutron self-shielding calculation methods for cylindrical samples in INAA

    Research outputpeer-review


    Neutron self-shielding has been a factor of concern in the history of Instrumental Neutron Activation Analysis. When the sample to be analyzed cannot be made small enough in size and/or sufficiently diluted, this undesired phenomenon must be accounted for. Several analytical, semi-empirical and computational methods for estimating the thermal neutron self-shielding effects have been extensively discussed in the literature and this work aims at the experimental validation of some of these methods by neutron irradiation of cylindrical samples containing strong thermal neutron absorbers. The accuracy and the relative differences in the results between these methods are discussed for cylindrical samples with up to 40% thermal self-shielding, showing that a semi-empirical sigmoidal function can be more accurate in modeling this effect than other exact algorithms, where a maximum 2% relative difference to the experimental values was obtained.
    Original languageEnglish
    Pages (from-to)529-534
    JournalJournal of Radioanalytical and Nuclear Chemistry
    Issue number2
    StatePublished - 4 Jan 2012
    Event13th International Conference on Modern Trends in Activation Analysis - Texas A&M University, College Station
    Duration: 14 Mar 201118 Mar 2011

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