Abstract
Samples of soils and plants collected at various locations in the Canadian Arctic for biomass and primary production study were also tested for radioactive contamination arising from nuclear weapons testing. Measurements with a gamma ray spectrometer showed that all the organic samples were contaminated with cesium-137, whereas the soils were relatively free of this isotope. A surprisingly high level of cesium-137 was observed in the fine organic sediments taken from a high-arctic oligotrophic lake. The radial distribution of cesium-137 in an rctic cushion plant, Dryas integrifolia, was determined and used to confirm a dating procedure for this type of plant. Samples collected in 1977 show radioactive contamination due to the Chinese nuclear explosion of September 1976. 26 references, 4 figures, 2 tables.
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