Abstract
This study reports the first data of 129I fallout in Scandinavia, covering the last 80 years. The investigation is based on sediment sections from a lake in central Sweden. In addition to analysis of 129I, a combination of several radionuclides ( 210Pb, 137Cs and 14C) was used to establish an accurate chronology of the sediment profile. The concentration of 129I exhibits an increasing trend (∼10 7 to ∼10 9 atoms/g) during the last 40 years, suggesting a significant atmospheric input from the nuclear reprocessing facilities in Sellafield (UK) and La Hague (France). A peak corresponding to fallout from the Chernobyl accident (1986) is clearly distinguishable, whereas the impact of fallout from the nuclear weapons' tests since the early 1950s is not distinguished.
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