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"Sixty-year environmental radioactivity and tracer studies in Denmark"
Wissenschaftlicher Vortrag in englischer Sprache
Referent: Dr. Jixin Qiao, Technical University of Denmark
Studies of environmental radioactivity were initiated in 1956 at the Research Establishment Risø located at Roskilde, Denmark. Our sixty-year record of environmental radioactivity data clearly indicate the anthropogenic radionuclides signal originated from global fallout of nuclear weapons testing during the 1960’s, fallout of the Chernobyl accident in 1986 as well as the Fukushima accident in 2011.
After the accident at Thule, Greenland in 1968, comprehensive studies have been carried out to investigate the local radioactive pollution (^137 Cs, ^90 Sr, ^238,239,240 Pu, ^237 Np, ^99 Tc, ^241 Am) and its radiological impact to the Arctic marine and terrestrial environment.
In the recent decades, several projects under Arctic Monitoring and Assessment Program (AMAP) have been carried out in Denmark to investigate the long-range transported radioactive contaminations in terrestrial and marine environments of Greenland and Faroe Island. On the other hand, anthropogenic radionuclides are also useful tracers to study the geochemical process and ocean current circulation which are important for several aspects including the migration of pollutants and climate change. Radioactive tracers (e.g., ^99 Tc, ^129 I) released from the two major European reprocessing plants (La Hague and Sellafield) have been employed as point source tracers to study the water movement in the North Atlantic-Arctic region.
In recent years, ^236 U oceanographic studies have also been carried out to investigate the source term of ^236 U in North Sea-Baltic Sea region as well as along Greenland coast.