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    STP1291

    Optimizing the Characterization of Iodine-129 and Technetium-99 in Radioactive Waste Using Inductively Coupled Plasma-Mass Spectrometry

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    Abstract

    In the case of principal waste streams from nuclear power plants and reprocessing plants, the characterization of some critical long-lived isotopes by ICP-MS is markedly affected by the complexity of sample composition.

    This paper gives a few indications on a French approach presently under study to ensure the safety of surface repository sites, from which it might be possible to assess a ranking of the principal isotopes and their desirable detection level. On this basis, the discussion concentrates on the methods currently under development in our laboratory to improve ICP-MS determination of 129I and 99Tc.

    In view of difficulties encountered during the dissolution of solid waste and selective extraction of the species into an organic phase, a new preparative procedure is being developed. It consists of a direct pyrohydrolysis applied with no prerequisite: after fixation into an alkaline solution, the volatile species can be directly measured by ICP-MS. The sensitivity and range of applicability of this method are discussed.

    Keywords:

    analysis of waste, ICP-MS, pyrohydrolysis, iodine-129, technetium-99, surface site repository


    Author Information:

    Noé, M
    Commissariat à l'Energie Atomique, Centre d'Etudes de Cadarache, Saint Paul lez Durance,

    Hérès, A
    Commissariat à l'Energie Atomique, Centre d'Etudes de Cadarache, Saint Paul lez Durance,


    Committee/Subcommittee: C26.13

    DOI: 10.1520/STP15977S