~239+340Pu and ~137Cs concentrations for zooplankton and nekton in the Northwest Pacific and Antarctic oceans (1993-996)

摘要

The concentrations of ~239+240Pu and ~137Cs in zooplankton and nekton in the northwest Pacific and Southern Oceans were measured during the period 1993-1996. The object of the sampling was to assess the potential impacts of existing submerged an- thropogenic-radioactive materials in the western North Pacific as well as the Eat China Sea. Samples form the Bransfield Strait of the Antarctic Ocean providea control source impacted by only atmospheric bomb fallout. No particularly elevated levels of ~239+240Pu were found in zooplankton samples form the Northwest Pacific, although significantly lower levels of ~239+240Pu were found in three mixed zooplankton samples form the Bransfield Strait.