Pacific Proving Grounds radioisotope imprint in the Philippine Sea sediments

Daniela Pittauer*, Per Roos, Jixin Qiao, Walter Geibert, Marcus Elvert, Helmut W. Fischer

*Corresponding author for this work

    Research output: Contribution to journalJournal articleResearchpeer-review

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    Abstract

    Radionuclide concentrations were studied in sediment cores taken at the continental slope of the Philippine Sea off Mindanao Island in the equatorial Western Pacific. High resolution deposition records of anthropogenic radionuclides were collected at this site. Excess 210Pb together with excess 228Th and anthropogenic radionuclides provided information about accumulation rates. Concentrations of Am and Pu isotopes were detected by gamma spectrometry, alpha spectrometry and ICP-MS. The Pu ratios indicate a high portion (minimum of 60%) of Pu from the Pacific Proving Grounds (PPG). This implies that the transport of PPG derived plutonium with the Mindanao Current southward is similarly effective as the previously known transport towards the north with the Kuroshio Current. The record is compared to other studies from northwest Pacific marginal seas and Lombok basin in the Indonesian Archipelago. The sediment core top was found to contain a 6 cm thick layer dominated by terrestrial organic matter, which was interpreted as a result of the 2012 Typhoon Pablo-related fast deposition.
    Original languageEnglish
    JournalJournal of Environmental Radioactivity
    Volume186
    Pages (from-to)131-141
    ISSN0265-931X
    DOIs
    Publication statusPublished - 2018

    Keywords

    • 137Cs
    • 241Am
    • Excess 228Th
    • Pacific Ocean
    • Plutonium
    • Typhoon

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