Temporal Trends of Artificial Radioactivity in European Seas

摘要

In open Atlantic water, the levels of most of the artificial fallout radionuclides decreased. The levels of Sellafield-derived radionuclides in the North Sea and adjacent Sea areas decreased as well, whereas levels of ~(99)Tc increased after 1995 due to higher liquid releases at Sellafield. The levels of ~(137)Cs in the Baltic Sea are still higher than before the Chernobyl accident in 1986; however, a continuous decrease due to outflow and deposition in sediments can now be ascertained.