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Zawartość zarchiwizowana w dniu 2024-04-19

Cycling of Cesium 137 and Strontium 90in natural ecosystems

Cel


The project gave an opportunity to investigate forest sites in Europe systematically and to compare the results from different types of forest grown on different soils under different climatic conditions. Due to this cooperation, the knowledge of basic principles in the behaviour of radionuclides in natural ecosystems was highly improved. Basic mechanisms concerning migration in soils, caesium-137 uptake by fungi and plants, transfer to animals and cycling within forest ecosystems are fairly well understood now. Data sets have been obtained, which are useful tools for site-specific long-term prognosis and helpful with respect to recommendations and considerations of countermeasures. The understanding of radionuclides behaviour in forest systems was improved significantly. It should be realized, however, that it is still difficult to define and develop advanced explanatory models which are suitable for forest sites in general. The difficulties are due to the great complexity and wide variations of these systems. To be more successful, more detailed investigations of the peculiarities of soil, plants, and animal species and of corresponding parameters, which have been recognized to be of greater importance, are required. The results of this project present a suitable basis for such further investigations.
THE PROJECT DEALS WITH THE CYCLING OF RADIOCESIUM AND -STRONTIUM WITHIN AND BETWEEN ABIOTIC AND BIOTIC COMPARTMENTS OF FORESTS AND WITH THE RADIATION EXPOSURE TO MAN BY THE EXTENSIVE USE OF THESE SYSTEMS. FOR THE INVEST IGATIONS DIFFERENT CONIFEROUS AND DECIDUOUS FORESTS WERE CHOSEN FROM DIFFERENT CLIMATE ZONES IN SWEDEN, BELGIUM, ITALY AND GERMANY. THE EXPERIMENTAL STRATEGY EMPHASIS ON PARAMETERS AND MECHANISMS TO UNDERSTAND AND TO QUA LIFY TRANSFER PROCESSES OF CS 137 AND STR 90. THE INVESTIGATIONS OF THE PARTICIPATING GROUPS COVER THE FOLLOWING CRITERIA :
- INFLUENCE OF SOIL CHARACTERISTICS ON THE RETENTION AND VERTICAL DISTRIBUTION OF CESIUM AND STRONTIUM IN THE DIFFERENT LAYERS OF THE SOIL, -THE PLANT AVAILABILITY AND BIOLOGICAL FIXATION OF THESE RADIONUCLIDES ES PECIALLY IN THE ORGANIC HORIZONS.
- THE INFLUENCE OF ROOTING DEPTH AND NUTRIENT LEVELS IN SOIL ON THE TRANS FER OF CS 137 AND SR 90 INTO PLANTS.
- RADIONUCLIDE CONCENTRATION PATTERNS IN VASCULAR PLANTS WITHIN A NATURAL FOREST ECOSYSTEM.
- THE DEPENDENCY OF THE ACCUMULATION RATES ON THE LIVING HABIT OF FUNGHI SPECIES.
- THE TRANSFER OF CS 137 AND SR 90 FROM PLANTS INTO MAMMALS. - THE DISTRIBUTION OF CS 137 AND SR 90 BETWEEN THE DIFFERENT FORESTS COMPAR TMENTS INVESTIGATED.
- IMPACT OF THE FOREST INDUSTRIES ON THE RADIONUCLIDE CYCLING. - THE RADIATION EXPOSURE TO MAN BY THE EXTENSIVE USE OF FOREST SYSTEMS INCLUDING WOOD MANUFACTURING.
- WHOLE BODY COUNTER MEASUREMENTS OF CRITICAL GROUPS.
BASED ON THE MEASUREMENT RESULTS, RADIOECOLOGICAL MODELLING WILL BE CARRIED OUT IN THREE LEVELS : DIFFERENT EQUATIONS DESCRIBING THE TRANSFER OF CS 137 AND SR 90 BETWEEN 2 COMPARTMENTS WILL BE DEVELOPED AND THEIR RELIABILITY STATISTICALLY ANALISED. MODELS DESCRIBING LONG TERM CYCLING WILL BE SUGGES TED CONSIDERING THE DISTRIBUTION OF THE RADIONUCLIDES WITHIN AND THE LOSS FROM THE SYSTEMS. FINALLY THE POTENTIAL RADIATION EXPOSURE TO MAN WILL BE ASSESSED ORIGINATING FROM THE EXTENSIVE USE OF THE NATURAL FOREST ENVIRON MENT.

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CSC - Cost-sharing contracts

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BUNDESAMT FUER STRAHLENSCHUTZ
Wkład UE
Brak danych
Adres
1,Ingolstädter Landstraße 1
85764 OBERSCHLEISSHEIM
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Ostatnia aktualizacja: 28 Czerwca 1993

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Permalink: https://cordis.europa.eu/project/id/FI3P0050/pl

European Union, 2024