Retrospective dosimetry based on niobium extraction and counting: VTT 's contribution to the RETROSPEC project

Tom Séren, Tommi Kekki

    Research output: Book/ReportReport


    Within the European Commission 5th Framework RETROSPEC project several irradiated VVER-440 pressure vessel materials have been investigated in order to determine the feasibility of "retrospective" neutron dosimetry based on the analysis of 93mNb induced in structural reactor materials containing small amounts of niobium (about 50 ppm to 1 %). Methods for chemical separation of niobium and activity measurements, previously developed at VTT, were tested and refined and found accurate and reliable for typical cladding materials. For base material containing niobium only as an impurity the methods were not successful. The measured specific 93mNb activities were in good agreement with both calculated activities and other induced activities in the same materials and in dedicated dosimetry materials irradiated together with the investigated materials. The results of the three participants (NRG Petten, VTT and SCKoCEN) will be compared and summarised in a final report published by NRG Petten. The feasibility of different chemical separation and activity determination methods will be evaluated in a Code of Practice.
    Original languageEnglish
    Place of PublicationEspoo
    PublisherVTT Technical Research Centre of Finland
    Number of pages40
    ISBN (Electronic)951-38-6180-5
    ISBN (Print)951-38-6179-1
    Publication statusPublished - 2003
    MoE publication typeNot Eligible

    Publication series

    SeriesVTT Tiedotteita - Meddelanden - Research Notes


    • nuclear reactors
    • reactor dosimetry
    • reactor materials
    • niobium
    • extraction
    • counting
    • retrospective dosimetry
    • pressure vessels
    • embrittlement


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