Journal article
Pacific Proving Grounds radioisotope imprint in the Philippine Sea sediments
University of Bremen1
Center for Nuclear Technologies, Technical University of Denmark2
The Hevesy Laboratory, Center for Nuclear Technologies, Technical University of Denmark3
Radioecology and Tracer Studies, Center for Nuclear Technologies, Technical University of Denmark4
Alfred Wegener Institute - Helmholtz Centre for Polar and Marine Research5
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.
Language: | English |
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Year: | 2018 |
Pages: | 131-141 |
ISSN: | 18791700 and 0265931x |
Types: | Journal article |
DOI: | 10.1016/j.jenvrad.2017.06.021 |
ORCIDs: | 0000-0002-3643-333X , 0000-0001-8646-2334 , 0000-0002-0593-5564 and Qiao, Jixin |