Migration dans les sols du cesium 137

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Elsevier Editorial System(tm) for Journal of Environmental Radioactivity Manuscript Draft

Manuscript Number: JENVRAD-D-08-00104R1 Title: Modeling of 137Cs migration in soils using an 80-year soil archive. Role of fertilizers and agricultural amendments Article Type: Research Paper Keywords: radioactivity, Chernobyl, pollution, radiocaesium Corresponding Author: Dr Fabrice Monna, CorrespondingAuthor's Institution: Université de Bourgogne First Author: Fabrice Monna Order of Authors: Fabrice Monna; Fokert van Oort; Philippe Hubert; Janusz Dominik; Jérome Bolte; Jean Luc Loizeau; Jérome Labanowski; Jérémi Lamri; Christophe Petit; Gaël Le Roux; Carmela Chateau Abstract: An 80-year soil archive, the 42-plot experimental design at the INRA in Versailles (France), is used here to studylong-term contamination by 137Cs atmospheric deposition and the fate of this radioisotope when associated with various agricultural practices: fallow land, KCl, NH4(NO3), superphosphate fertilizers, horse manure and lime amendments. The pertinence of a simple box model, where radiocaesium is supposed to move downward by convectional mechanisms, is checked using samples from control plots which had beenneither amended, nor cultivated since 1928. This simple model presents the advantage of depending on only two parameters: , a proportional factor allowing the historical atmospheric 137Cs fluxes to be reconstructed locally, and k, an annual loss coefficient from the plow horizon. Another pseudounknown is however necessary to run the model: the shape of historical 137Cs deposition, but thisfunction can be easily computed by merging several curves previously established by other surveys. A loss of  1.5% per year from the plow horizon, combined with appropriate fluxes, provides good concordance between simulated and measured values. In the 0-25 cm horizon, the residence half-time is found to be  18 years (including both migration and radioactive decay). Migration rate constants are alsocalculated for some plots receiving continuous long-term agricultural treatments. Comparison with the control plots reveals significant influence of amendments on 137Cs mobility in these soils developed from a unique genoform.

* Response to Reviewers Click here to download Response to Reviewers: answer to reviewers.pdf

Fabrice.Monna@u-bourgogne.fr Dijon, September 14th 2008, Dear Sir,S c ie nr crees e

Please find enclosed the revised version of the manuscript modified as recommended by the reviewers, who are thanked for their precious comments. You will find two versions. In the first one, the modifications are clearly visible as we used the revision tracker implemented in Word. The second version is the definitive one. Below are listed the replies to the reviewerremarks, which have all been followed. Reviewer 1: Typing mistakes have been corrected. Legends of tables have been modified as recommended. More references have been cited to provide a better overview of the available literature. Reviewer 2:
Eight new references have been added. They concern chemical extractions of caesium in soils, the transfer of caesium via plant roots, and the long‐term experiments using lysimeters. Now 45  references are cited.  A  better  effort  has  been  undertaken  to  stress  the  novelty  of  this  study  which  is  based  on  the 

exploitation of a very long term time series. 

Please feel free to contact me if any further information is required. Yours sincerely
Fabrice Monna  Maître de conférences à l’Université de Bourgogne 
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Centre des Sciences de la Terre  UMR Université de Bourgogne – CNRS 5594

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