Pittauer Daniela, Roos Per, Qiao Jixin, Geibert Walter, Elvert Marcus, Fischer Helmut W
University of Bremen, MARUM - Center for Marine Environmental Sciences, Leobener Str. 8, D-28359 Bremen, Germany; University of Bremen, Institute of Environmental Physics, Otto-Hahn-Allee 1, D-28359 Bremen, Germany.
Center for Nuclear Technologies, Technical University of Denmark, DTU Risø Campus, DK-4000 Roskilde, Denmark.
J Environ Radioact. 2018 Jun;186:131-141. doi: 10.1016/j.jenvrad.2017.06.021. Epub 2017 Aug 23.
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 Pb together with excess Th 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.
对取自赤道西太平洋棉兰老岛附近菲律宾海大陆坡的沉积物岩芯中的放射性核素浓度进行了研究。在该地点收集了人为放射性核素的高分辨率沉积记录。过量的铅以及过量的钍和人为放射性核素提供了有关积累速率的信息。通过伽马能谱法、阿尔法能谱法和电感耦合等离子体质谱法检测了镅和钚同位素的浓度。钚的比率表明，来自太平洋试验场（PPG）的钚占很大比例（至少60%）。这意味着源自PPG的钚随棉兰老洋流向南的运输与之前已知的随黑潮向北的运输同样有效。该记录与西北太平洋边缘海和印度尼西亚群岛龙目盆地的其他研究进行了比较。发现沉积物岩芯顶部有一层6厘米厚的以陆地有机物为主的层，这被解释为2012年与台风巴勃罗相关的快速沉积的结果。
