~(137)Cs and ~(239+240)pu in the Bohai Sea of China: Comparison in distribution and source identification between the inner bay and the tidal flat

摘要

We investigated artificial radionuclides (Pu239+240 and Cs-137) in surface sediments and sediment cores collected from the Bohai Bay and the tidal flat of the Liaodong Bay, China. Increasing trends for Pu239+240 activities and Pu-240/Pu-239 atom ratios (0.18) were observed from land to sea and from north to south in the Bohai Bay. This spatial pattern implied that the scavenging process between riverine sediments and Pacific Proving Ground (PPG) source Pu transported by the currents such as Yellow Sea Warm Current had occurred in the Bohai Bay. In contrast, relatively lower Pu-240/Pu-239 atom ratios in the tidal flat of Liaodong Bay were due to the mixing process between more global out and less PPG source Pu. The riverine Pu contributions to the total global fallout Pu in the Haihe River (32.8%) were much lower than those in the Yangtze River estuary (77%-80%), indicating better soil conservation in the Haihe River Catchment.