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- W1567771307 abstract "In January 1968, a B52 plane carrying 4 nuclear weapons crashed on the sea ice ̃12 km from the Thule Air Base, in northwest Greenland. The benthic marine environment in the 180–230 m deep Bylot Sound was then contaminated with ̃1.4 TBq 239,240Pu (̃0.5 kg). The site was revisited in August 1997, 29 years after the accident. Water and brown algae data indicate that plutonium is not transported from the contaminated sediments into the surface waters in significant quantities. Sediment core data only indicate minor translocation of plutonium from the accident to the area outside Bylot Sound. The present data support an earlier quantification of the sedimentation rate as 2–4 mm per year, i.e. 512 cm during the 29 years since the accident. Biological activity has mixed accident plutonium much deeper down, to 2030 cm, and the 512 cm new sediment has been efficiently mixed into the contaminated layer. In addition to the classical bioturbation mixing the upper _~5 cm, the plutonium data indicate the existence of a deeper bioturbation gradually decreasing with depth. Transfer of plutomum to benthic biota is low leading to 12 orders of magnitude lower concentrations in biota than in sediments. Some biota groups show a somewhat higher uptake of americium than of plutonium. Sediment samples with weapons plutonium from the accident show a significant variation in 240Pu/239Pu atom ratios in the range 0.0270.057. This supports the hypothesis that the Thule plutonium originates from at least two sources of different quality. The radioecological implication of the observed variations is that the use of plutonium isotope ratios in quantitatively determining the influence of different plutonium sources is a very complex affair requiring substantial data sets." @default.
- W1567771307 created "2016-06-24" @default.
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- W1567771307 date "2001-01-01" @default.
- W1567771307 modified "2023-09-25" @default.
- W1567771307 title "Plutonium in the marine environment at Thule, NW-Greenland after a nuclear weapons accident" @default.
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- W1567771307 doi "https://doi.org/10.1016/s1569-4860(01)80004-8" @default.
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