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Groundwater residence time downgradient of Trench No. 22 at the Chernobyl Pilot Site: Constraints on hydrogeological aquifer functioning |
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| Authors: | C Le Gal La Salle L Aquilina E Fourre P Jean-Baptiste J-L Michelot C Roux D Bugai T Labasque C Simonucci N Van Meir A Noret S Bassot A Dapoigny D Baumier P Verdoux D Stammose J Lancelot |
| Institution: | 1. Université de Nîmes, Laboratoire de Géochimie Isotopique (GIS), 150 rue Georges Besse, 30035 Nîmes, France;2. Aix Marseille Université-CNRS, UMR CEREGE 6635, Europôle de l’Arbois, 13545 Aix en Provence, France;3. Université Rennes 1 - CNRS, OSUR-Géosciences Rennes, Campus Beaulieu, 35042 Rennes cedex France;4. LSCE/IPSL - UMR8212 CEA/CNRS/UVSQ, Saclay Center, F91191 France;5. Université Paris-Sud - CNRS, UMR IDES, bât. 504, 91405 Orsay, France;6. Institute of Geological Sciences, 55-b, Gonchara Str., Kiev, 01054, Ukraine;g IRSN, PRP-DGE/SRTG/LETIS, POB 17, F-92262, Fontenay-aux-Roses, France;h IRSN, PRP-DGE/SRTG/LAME, POB 17, F-92262, Fontenay-aux-Roses, France |
| Abstract: | Following the explosion of reactor 4 at the Chernobyl power plant in northern Ukraine in 1986, contaminated soil and vegetation were buried in shallow trenches dug directly on-site in an Aeolian sand deposit. These trenches are sources of radionuclide (RN) pollution. The objective of the present study is to provide constraints for the Chernobyl flow and RN transport models by characterising groundwater residence time. A radiochronometer 3H/3He method (t1/2 = 12.3 a) and anthropogenic tracers including CFC and SF6 are investigated along with the water mass natural tracers Na, Cl, 18O and 2H. |
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