Abstract
129I (T1/2 = 15.7 Ma) concentrations were measured in sediments from Lake Ontario, whose drainage basin contains a former nuclear fuel reprocessing facility. Three archived sediment cores had 129I concentrations from approximately 1 × 105 atoms/g in deeper sections to 1 × 109 atoms/g at the surface, elevated above the nuclear weapons testing signal for North America. 129I concentrations and 129I/127I ratios increase upwards and indicate a significant anthropogenic influence, with the vast majority of the 129I in each core being found near the surface. There is also some penetration into deeper sediment layers, with pre-nuclear 129I/127I ratios only reached at depths of 10–13 cm. The data show that Lake Ontario sediments are a repository for anthropogenic 129I from regional nuclear fuel reprocessing. The results point to the mobilization of iodine from anoxic, deeper sediment layers, shedding light on the geochemical behavior of iodine isotopes in Lake Ontario’s sediments.
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