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- Title
A dynamic model for radionuclide transfer from water to freshwater fish
- Authors
Garnier-Laplace, J.; Baudin, J. P.; Vray, F.
- Abstract
A dynamic model for radionuclide transfer from water to fish is presented, from its design stages to its in situ validation. Four steps are proposed in order to apply the model, for predictive purposes, to 137Cs and 106Ru in case of the Rhone (S.E. France), downstream of the Marcoule fuel reprocessing plant. The first step consists of an experimental laboratory study conducted on a species which is representative of the second order trophic level (Cyprinus carpio L.). Compartmental analysis then allows construction of theconceptual model of the organism. The number of compartments necessary to represent the organism and the kinetic parameters quantifying the transfer studied are estimated using a standardized procedure for the statistical processing of results. A numerical method which allows consideration of all the fluctuations recorded in the radionuclide concentration in the water during the exposure phase is shown. Direct137Cs transfer is modeled on the basis of a single compartment, characterized by the exchange kinetics constants A 2 = 0.224 d - 1 and lambda2 = 0.0065 d -1. For 106Ru, two compartments are necessary order to model the exchange kinetics. They are characterized by the constants A 1 = 1.319 d -1 and lambda 1 = 0.638 d -1, A 2 = 0.198 d -1 andlambda 2 = 0.0261 d -1. For a theoretical fish having zero growth, and for constant concentration in water, these transfer kinetics lead to concentration factor values of 34 L Kg w.w.-1 for 137Cs and 10 L Kg w.w. -1 for 106Ru. The corresponding long biological half-lives are 106 days and 27 days. A different transfer model expression is necessary based on the radionuclide tissue distribution differences within the organism. The major distribution of the 137Cs in muscle wh
- Subjects
BIOACCUMULATION; CESIUM; MATHEMATICAL models
- Publication
Water, Air & Soil Pollution, 1997, Vol 98, Issue 1-2, p141
- ISSN
0049-6979
- Publication type
Article
- DOI
10.1007/BF02128654