Long-term study of 99Tc in the marine environment on the Swedish west coast
| Autor: | Sören Mattsson, Bengt Erlandsson, Per Roos, Christoffer Ellmark, Torbjörn Gäfvert, Patric Lindahl, Elis Holm |
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| Rok vydání: | 2003 |
| Předmět: |
Water Pollutants
Radioactive Fucus serratus Health Toxicology and Mutagenesis Fucus vesiculosus Dry weight medicine Environmental Chemistry Humans Seawater Water pollution Waste Management and Disposal Sweden biology Ocean current Technetium General Medicine Seasonality biology.organism_classification medicine.disease Seaweed Pollution Oceanography Cesium Radioisotopes Radioactive Waste Fucus Environmental science Environmental Monitoring |
| Zdroj: | Journal of environmental radioactivity. 67(2) |
| ISSN: | 0265-931X |
| Popis: | The activity concentration of (99)Tc in brown seaweed (Fucus vesiculosus and Fucus serratus) and seawater were analysed in samples collected in 1991, 1995 and 2001 at several stations along the Swedish west coast. In addition to these locations, a well-defined site (Sardal, 56.76 degrees N, 12.63 degrees E) was included with (99)Tc activity concentration data in seaweed from 1967 to 2000. Over the years, the major source of (99)Tc in the coastal waters of western Sweden has been the radioactive liquid discharge from the nuclear fuel reprocessing plant in Sellafield (UK) transported via ocean currents in the North Sea. The (99)Tc activity concentration in seaweed at the Sardal site increased from approximately 30 Bq kg(-1) up to 230 Bq kg(-1) (dry weight) between 1997 and 2000 due to the Sellafield EARP (Enhanced Actinide Removal Plant) discharges in 1995-1996, yielding an approximate transport time of 4-5 years between the Irish Sea and the Kattegat. Due to the very sharp gradient in (99)Tc concentration between the Baltic Sea and the North Sea, (99)Tc is presently one of the best transit tracers for the recent ventilation events in the Baltic Sea. |
| Databáze: | OpenAIRE |
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