Cel The possibility of significant remobilisation of radionuclides from a catchment suggests that lakes and rivers (and ground waters in some catchments) may contain significant concentrations of caesium and strontium for much longer times than might have been expected. The objectives of this project are to investigate the processes of remobilisation of radionuclides from lake and river catchments. Concentrations of radioactivity in fish collected after the Chernobyl accident showed a considerable amount of scatter; these differed by two orders of magnitude for fish of the same species collected on the same day. This variability is reduced in some species, but apparently not in all, when allowances are made for differences in fish size. Major objectives of the project are to determine the importance of feeding physiology on the variability of radionuclide levels in fish at different trophic levels, to incorporate the basic processes into a functional model radionuclide transfer to fish and to incorporate this information into sampling programmes for dose estimation in man. Experimental projects should be undertaken with the following main objectives: radiocaesium mobilisation from fresh water sediments and flooded peat soils should be quantified. the importance of frayed edge sites on illite mineral grains for the long term immobilisation of caesium should be investigated together with its displacement by inorganic and/or organic chemical species. the importance of particle resuspension and subsequent radionuclide reequilibration should be investigated as a potential means of remobilisation; the dominant remobilisation processes should be defined, correlating pore water chemistry and caesium. estimates should be made of in situ Kd values and the environmental parameters which cause variations in space and time should be identified. the results of the experimental programmes should be used in conjunction with other data to further improve models for assessing the migration of radionuclides to water bodies with a major emphasis on the catchment-to-water pathway. Dynamics of accumulation of radionuclides in fish the relationship between the concentrations of caesium-137 and strontium-90 in fish species of different trophic levels and in their food (zooplankton, marofauna) should be investigated. the role of age and size on radionuclide uptake in fish. stochastic models should be developed for assessing the variability of radionuclide contamination in fish. Program(-y) IC-COSU C - Collaboration with the former Soviet Union in Radiation Protection, 1991- Temat(-y) Data not available Zaproszenie do składania wniosków Data not available System finansowania CSC - Cost-sharing contracts Koordynator NATURAL ENVIRONMENT RESEARCH COUNCIL Wkład UE Brak danych Adres Far Sawrey The Ferry house LA22 OLP AMBLESIDE Zjednoczone Królestwo Zobacz na mapie Linki Strona internetowa Opens in new window Koszt całkowity Brak danych Uczestnicy (3) Sortuj alfabetycznie Sortuj według wkładu UE Rozwiń wszystko Zwiń wszystko Direcção-Geral do Ambiente - Ministério do Ambiente e Recursos Naturais Portugalia Wkład UE Brak danych Adres 10,Estrada Nacional 2685 Sacavem Zobacz na mapie Koszt całkowity Brak danych ENERGY RESEARCH CENTRE OF THE NETHERLANDS Niderlandy Wkład UE Brak danych Adres Westerduinweg 3 PETTEN Zobacz na mapie Linki Strona internetowa Opens in new window Koszt całkowity Brak danych Ente per le Nuove Tecnologie, l'Energia e l'Ambiente (ENEA) Włochy Wkład UE Brak danych Adres Via Vitaliano Brancati 48 00144 Roma Zobacz na mapie Koszt całkowity Brak danych
