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Study of a protected catchment basin: analyses of anthropogenic radionuclides

Published online by Cambridge University Press:  24 May 2012

Amélie Leclercq ,
Violaine Philippini ,
Hervé Michel ,
Tiina-Leena Lavonen ,
Eric Ansoborlo ,
Christophe Den Auwer ,
Vittorio Barci ,
Pier Lorenzo Solari  and
Geneviève Barci-Funel
Amélie Leclercq
Affiliation:
Nice Chemistry Institute, University of Nice Sophia-Antipolis, 06100 Nice, France
Violaine Philippini
Affiliation:
Nice Chemistry Institute, University of Nice Sophia-Antipolis, 06100 Nice, France
Hervé Michel
Affiliation:
Nice Chemistry Institute, University of Nice Sophia-Antipolis, 06100 Nice, France
Tiina-Leena Lavonen
Affiliation:
Nice Chemistry Institute, University of Nice Sophia-Antipolis, 06100 Nice, France Laboratory of Radiochemistry, Department of Chemistry, Faculty of Science, University of Helsinki, 00014 Helsinki, Finland
Eric Ansoborlo
Affiliation:
CEA Nuclear Energy Division, DRCP, Marcoule, 30207 Bagnols sur Cèze, France
Christophe Den Auwer
Affiliation:
Nice Chemistry Institute, University of Nice Sophia-Antipolis, 06100 Nice, France
Vittorio Barci
Affiliation:
Nice Chemistry Institute, University of Nice Sophia-Antipolis, 06100 Nice, France
Pier Lorenzo Solari
Affiliation:
Synchrotron SOLEIL, MARS beam line, 91108 Gif sur Yvette, France
Geneviève Barci-Funel
Affiliation:
Nice Chemistry Institute, University of Nice Sophia-Antipolis, 06100 Nice, France
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Abstract

Natural samples of soil, sediment and natural water were collected in the “Parc National du Mercantour” in France. Soil and sediment samples were studied to better understand the behaviors of radionuclides (RNs) in different natural compartments. Considering 137Cs and 241Am activities in depth (measured by α- and γ-spectrometries), two types of sediment profiles can be distinguished depending on the origin (Chernobyl accident or atmospheric nuclear weapon tests). Due to difficulties in modeling the dispersion of those RNs in natural samples, even in a protected area, semi-synthetic studies were conducted. Eu(III) was used as an analogue of Am(III). Eu behavior in water was studied by EXAFS and compared to speciation diagrams drawn in similar chemical conditions. Eu is mainly complexed by carbonate and phosphate ions. The mean Eu-O distance (2.46 Å) obtained by EXAFS is in agreement with predominant solid species determined by speciation diagrams and previous published studies.

Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1444: Symposium S/Y – Actinides and Nuclear Energy Materials , 2012 , mrss12-1444-y01-06
Copyright
Copyright © Materials Research Society 2012

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