Determination of 99Tc in Environmental Samples by Anion Exchange

Q.J. Chen, A. Aarkrog, H. Dahlgaard, Sven Poul Nielsen, H.L. Jensen, J. Bruun, A. Holm Pedersen, K. Mandrup

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    Abstract

    The chemical yield of technetium by an anion exchange (AG 1-X4) procedure is determined under different conditions from 200 liters sea water. A new method for collecting 99Tc from 200-400 liters sea water has been developed by anion exchange. The evaporation rates of RuO4 and TcO-4 are determined at 100°C in 0.1 N H2SO4. A higher decontamination factor 2.S x105 - 2.4 x 107 for ruthenium is obtained by evaporating the RuO4 at 100°C in 0.1 N H2SO4. The ruthenium is oxidized to RuO-4 with NaClO at pH = 9. Fe(OH)3 scavenging, AgCl precipitation and 5% TIOA/xylene extraction at controlled valence are used for decontamination of ruthenium, 110mAg and other nuclides. The chemical yield of technetium-99 in the procedure is about 70%.
    Original languageEnglish
    Place of PublicationRoskilde
    PublisherRisø National Laboratory
    Number of pages20
    ISBN (Print)87-550-1456-9
    Publication statusPublished - 1988
    SeriesRisø-M
    Number2739
    ISSN0418-6435

    Keywords

    • Risø-M-2739

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