Estimates of 239+240Pu inventories in Gdansk bay and Gdansk basin

This paper presents and discusses the results of 239+240Pu determinations in different components of Gda sk bay and Gda sk basin ecosystem, as well as estimated sources and inventories of plutonium in these basins. The total plutonium 239+240Pu activities deposited in Gda sk bay and Gda sk basin sediments are 1.18 TBq and 3.77 TBq, respectively. Two rivers, the Vistula and Neman rivers, and atmospheric fallout were distinguished as the main sources of plutonium in these basins. In seawater (with suspended matter included) there is about 2.33 GBq 239+240Pu (0.2% of total activity) in Gda sk bay and 9.92 GBq 239+240Pu (0.3% of total activity) in Gda sk basin. In both cases, 56% of 239+240Pu is associated with suspended matter. Organisms contain 3.81 MBq in Gda sk bay and 7.45 MBq 239+240Pu in Gda sk basin. From this value in Gda sk bay 82.1% of plutonium is associated with zoobenthos, 13.6% with phytobenthos, 1.6% with phytoplankton, 1.5% with zooplankton and 1.2% with fish. In Gda sk basin, 83.2% is associated with zoobenthos, 7.5% with phytobenthos, 3.6% with phytoplankton, 3.2% with zooplankton and 2.5% with fish.