Plutonium in Southern Hemisphere ocean Waters

K. Hirose, M. Aoyama, J. Gastaud, M. Fukasawa, C.-S Kim, I. Levy, P. P. Povinec, Per Roos, J. A. Sanchez-Cabeza, S. A. Yim

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    Plutonium in seawater collected by the BEAGLE2003 cruise was determined using ICP- SF-MS and alpha spectrometry after Fe co-precipitation and radiochemical purification. Levels and distributions of dissolved plutonium activity concentrations in Southern Hemisphere ocean waters are summarized here, including historical data. Pu-239 concentrations in surface water----of the central South Pacific (32.5 °S) in 2003 were around 1 mBq/m3. The 239Pu concentrations in the Indian Ocean surface waters (20°S) were similar to that in the South Pacific, whereas the 239Pu concentrations in the South Atlantic surface waters (30°S) were markedly lower than those in the South Pacific and Indian Oceans. The 239Pu vertical profile pattern was similar to that in the North Pacific subtropical gyre, although 239Pu concentrations in the deep South Pacific were significantly lower than those in the North Pacific. One of the dominant factors controlling plutonium distributions in the Southern Hemisphere oceans is biogeochemical processes including particle scavenging.
    Original languageEnglish
    JournalInternational Atomic Energy Agency. Proceedings Series
    Pages (from-to)493-500
    Publication statusPublished - 2013
    EventInternational Symposium on Isotopes in Hydrology, Marine Ecosystems, and Climate Changes Studies - Monaco, Monaco
    Duration: 27 Mar 20111 Apr 2011


    ConferenceInternational Symposium on Isotopes in Hydrology, Marine Ecosystems, and Climate Changes Studies


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