Volume 37, Number C1, February 2002ECORAD 2001: The Radioecology - Ecotoxicology of Continental and Estuatine Environments
|Page(s)||C1-1055 - C1-1060|
|Published online||25 March 2010|
The Chernobyl pilot site project: Isolation and microscopic characterisation of fuel particles
Institut de Protection et de Sûrete Nucléaire, IPSN/DPRE/SERGD/LESTS, BP. 6, 92265 Fontenay-aux-Roses cedex, France
A method of fuel particles separation from contaminated soil samples in heavy liquid was developed. Numerous particles have been isolated and characterised by Scanning Electron Microscopy. 14 years after Chernobyl accident 52% of Cs, 70% of Eu and Sr and 65% of Am still are associated with fuel particles. Hence the source term is mainly represented by fuel particles with a mean diameter of 4.17 µm. The source term consist of 2 types of particles: UO and ZrUO. Zr-U-O fuel particles account for 74% of the studied particles and showed much higher stability. Therefore the description of Chernobyl source term weathering requires 2 dissolution laws: a first one concerning UO particles with a higher dissolution constant and a second one with a low dissolution constant describing Zr-U-O dissolution.
© EDP Sciences, 2002
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