Long-term contaminant migration and impacts from uranium mill tailings.
As part of the BIOMOVS II study, a Working Group was established with the primary aim of comparing computer models used to assess the long-term impacts of contaminants released from uranium mill tailings piles, involving multiple pathways, multiple contaminants and multiple environmental receptors.
The application of models to two scenarios (V1 and V2) allowed participants to gain an improved understanding of important processes and to compare the representation of these processes in the models.
Partly as a result of this, new models were developed and the functionality of existing models was enhanced.
Model results for the scenarios were compared quantitatively and agreed well (often within a factor of three) for the more tightly specified V2 scenario.
In so far as the scenarios represent generic sites, the following generic conclusions can be drawn.
A range of pathways and contaminants affect the total dose/intake and so no single pathway or contaminant is dominant for all scenarios to the exclusion of all other pathways or contaminants.
Peak impacts on individuals may not arise for many hundreds of years.
Simplification of the 238U decay chain, by assuming 210Pb and 210Po are in secular equilibrium in the biosphere with the long-lived parent, 226Ra, is inappropriate. (...)
Mots-clés Pascal : Pollution radioactive, Environnement, Biosphère, Stockage déchet radioactif, Devenir polluant, Phénomène transport, Radioisotope, Uranium 238, Modélisation, Modèle prévision, Etude comparative, Précision, Radiocontamination, Modèle probabiliste, Modèle déterministe, Analyse risque
Mots-clés Pascal anglais : Radioactive pollution, Environment, Biosphere, Radioactive waste storage, Pollutant behavior, Transport process, Radioisotope, Uranium 238, Modeling, Forecast model, Comparative study, Accuracy, Radioactive contamination, Probabilistic model, Deterministic model, Risk analysis
Notice produite par :
Inist-CNRS - Institut de l'Information Scientifique et Technique
Cote : 99-0114390
Code Inist : 001D16E. Création : 16/11/1999.