Description: Die kuenstlichen Radionuklide Pu, Am und Np wurden durch Kernwaffentests freigesetzt und finden sich u.a. in Gewaessersedimenten wieder. Durch hochaufloesende Analysen von Sedimentkernen (0,5 cm) und das gesamte Gewaesser erfassende Proberaster (ca. 50 Sedimententnahmestellen) wird das Transport- und Mobilitaetsverhalten dieser Nuklide erfasst und spaeter modelliert. Die Ergebnisse liefern Grundlagenerkenntnisse ueber die Wirkung biogeochemischer und mikrobieller Prozesse auf das Verteilungsmuster von radioaktiven Elementen in natuerlichen Oekosystemen. Hauptauftragnehmer: Uppsala University, Department of Physics; Uppsala; Sweden.
Types:
SupportProgram
Origins:
/Bund/UBA/UFORDAT
Tags:
Kohlenstoffgehalt
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Americium
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Biologische Wirkung
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Eutrophierung
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Gewässerbelastung
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Plutonium
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Radioaktiver Abfall
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Transuran
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Erosion
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Gewässersediment
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Gewässerüberwachung
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Messprogramm
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Radionuklid
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Sedimentkern
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Radioaktives Element
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Halbwertszeit
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Gewässerversauerung
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Atomtest
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Oberflächengewässer
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Aquatisches Ökosystem
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Oxidation
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Biologischer Abbau
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Analyseverfahren
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Simulation
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Strahlenrisiko
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Mikroorganismen
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Sediment
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Bohrkern
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Modellierung
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Europäische Union
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Hydrologie
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Informationsgewinnung
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Radioaktivität
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Stofftransport
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Umweltpolitik
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Breiter-Luzin
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Schadstoffmobilisierung
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Schadstoffverbleib
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Brandenburg [Land]
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See [Binnengewässer]
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Stechlinsee
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Feldberger-Seengebiet
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Hartwasserseen
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Mikrobielle-Aktivitaet
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Neptunium
?
Region:
Berlin
Bounding boxes:
13.41377° .. 13.41377° x 52.5233° .. 52.5233°
License: cc-by-nc-nd/4.0
Language: Deutsch
Organisations
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Forschungsverbund Berlin, Leibniz-Institut für Gewässerökologie und Binnenfischerei (Betreiber*in)
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Kommission der Europäischen Gemeinschaften Brüssel (Geldgeber*in)
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Natural Environment Research Council, Institute of Freshwater Ecology Wareham (Mitwirkende)
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Umweltbundesamt (Bereitsteller*in)
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University Liverpool (Mitwirkende)
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University Umea (Mitwirkende)
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University Uppsala (Mitwirkende)
Time ranges:
1997-01-01 - 1999-06-30
Alternatives
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Language: Englisch/English
Title: Large-Scale and Long-Term Environmental Behaviour of Transuranic Elements as Modelled trough European Surface Water Systems
Description: General Information: Because of their long half-live times, Pu, Am and Np are subject to large-scale and long-term mobilization and delayed effects that are forced by surface-water interactions with soils and sediments. Through reconstruction of highly resolved temporal records of Pu, Am and Np in lake-sediments from well-defined lake-systems, the influence of the mentioned mobilization and delayed effects in different surface-water systems will be quantitatively modelled. High resolution sediment chronologies will be obtained through ultra sensitive alpha and gamma spectrometries. Furthermore, integrated cores from the lakes along with other data on transuranic inventories in waters and soils as well as atmospheric fluxes will be utilized for mass-balance calculations. The project will allow to obtain important information for EC-policies concerning the development of: (a) more objectively based evaluations on radiation risks; and (b) environmentally appropriate techniques and management strategies for environmental/ecological restorations of aquatic and soil systems. Moreover, decommissioning of nuclear installations and disposal of radioactive waste are among future issues that require precise knowledge on the behaviour of the ever increasing quantities of transuranics. There are a set of critical environmental factors that influence the dynamics and rates of transportation and mobilization of Pu, Am and Np through within-system and between-system interactions in European surface waters. The mentioned factors are: reduction/oxidation conditions, carbonate concentration, acidification, erosion/ eutrophication, resuspension, physical and chemical speciation (including colloidal states), diagenetic processes and microbic activities. In this project we will identify and quantify various parameters influencing large-scale and long-term behaviour of the transuranics in European fresh-waters under different limnological and hydrological conditions on the one hand, and the geochemical and biogeochemical properties of catchment soils/bedrocks and lake/river sediments on the other. Six lakes from three different regions (two lakes/region), ranging from severely acidified environments to eutrophied hard-water lakes, will be utilized in this project. The lakes with long water turnover times will allow modelling internal translocations and mobilities within the sediments and the lake water bodies (within system interactions), while the short residence times of the other lakes will provide information on fast responses that are induced by interactive processes in lake catchments (between system interactions). A multidisciplinary project such as this would require comprehensive integration of various radiometric and non-radiometric tools and approaches in order to allow proper modelling and simulations of the environmental behaviour of the transuranics. Prime Contractor: Uppsala University, Department of Physics; Uppsala; Sweden.
https://ufordat.uba.de/UFORDAT/pages/PublicRedirect.aspx?TYP=PR&DSNR=60041
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