Retrospective dosimetry of fast neutrons focused on the reactions 93Nb (n,n') 93Nbm and 54Fe(n,p)54Mn

W. P. Voorbraak, Tommi Kekki, Tom Serén, M. Van Bockxstaele, J. Wagemans, J. R. W. Woittiez

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    Abstract

    An overview is given of practices for “retrospective” dosimetry based on extraction and counting of niobium and manganese present in typical pressure vessel materials.
    The main problem of counting structural materials is the overwhelming presence of the nuclide 60Co in the gamma-ray spectra of irradiated materials.
    Chemical separation of niobium and manganese is needed to determine the induced 93Nbm and 54Mn activities. Procedures have been developed for retrospective dosimetry applicable at normally equipped radiochemical laboratories.
    Chemical separation procedures have been applied followed by determination of the amount of niobium in dissolution after separation. Special attention has been given to the accurate counting of the very weak X rays of 93Nbm. Different techniques have been applied. Advantages, disadvantages, and the accuracy that can be achieved are discussed.
    Special attention has been given to the maximum accuracy that can be reached and the minimum amount of niobium that has to be collected to reach this accuracy.
    Original languageEnglish
    Article numberPaper ID JAI101142
    JournalJournal of ASTM International
    Volume4
    Issue number4
    DOIs
    Publication statusPublished - 2007
    MoE publication typeA1 Journal article-refereed

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    Voorbraak, W. P., Kekki, T., Serén, T., Van Bockxstaele, M., Wagemans, J., & Woittiez, J. R. W. (2007). Retrospective dosimetry of fast neutrons focused on the reactions 93Nb (n,n') 93Nbm and 54Fe(n,p)54Mn. Journal of ASTM International, 4(4), [Paper ID JAI101142]. https://doi.org/10.1520/JAI101142