F. Siclet
Électricité de France
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Publication
Featured researches published by F. Siclet.
Estuarine Coastal and Shelf Science | 2003
Philippe Ciffroy; Jean-Louis Reyss; F. Siclet
The aim of the present work was to evaluate the half life of suspended particles in the Loire estuarine turbidity maximum by analysis of 7 Be budgets. The methodology was based on in situ sampling and further measurements aiming at quantifying 7 Be sources (atmospheric deposition and river inputs) and 7 Be stock in the water column of the turbidity maximum. 7 Be river inputs were determined by monthly 7 Be measurements performed upstream of the estuary. 7 Be atmospheric deposition was estimated by using an empirical relation between 7 Be deposition and rainfall. 7 Be in particles of the estuarine turbidity maximum was measured at eight different dates corresponding to different tidal and hydrological conditions. 7 Be sources and stocks thus determined have been compared to a mathematical model. Results allow to quantify the standard half life of suspended particles in the Loire estuarine turbidity maximum and show that it depends on the season (6–10 months in summer and about 0.7 month during flood periods). Furthermore, a rather good linear correlation was observed between the standard half life of particles and the sum of flow rates in the Loire river during 60 days before each sampling date. The kinetic evolution of the mass of particles within the turbidity maximum could be estimated by this method and appeared to be consistent with previous studies. Moreover, the method proposed in this study could presumably be used for estimating 60 Co concentrations in the estuarine turbidity maximum. 2003 Elsevier Science B.V. All rights reserved.
Journal of Environmental Radioactivity | 2008
Jun Koarashi; P.A. Davis; D. Galeriu; A. Melintescu; M. Saito; F. Siclet; Shigeo Uchida
Carbon-14 (14C) is one of the most important radionuclides from the perspective of dose estimation due to the nuclear fuel cycle. Ten years of monitoring data on 14C in airborne emissions, in atmospheric CO2 and in rice grain collected around the Tokai reprocessing plant (TRP) showed an insignificant radiological effect of the TRP-derived 14C on the public, but suggested a minor contribution of the TRP-derived 14C to atmospheric 14C concentrations, and an influence on 14C concentrations in rice grain at harvest. This paper also summarizes a modelling exercise (the so-called rice scenario of the IAEAs EMRAS program) in which 14C concentrations in air and rice predicted with various models using information on 14C discharge rates, meteorological conditions and so on were compared with observed concentrations. The modelling results showed that simple Gaussian plume models with different assumptions predict monthly averaged 14C concentrations in air well, even for near-field receptors, and also that specific activity and dynamic models were equally good for the prediction of inter-annual changes in 14C concentrations in rice grain. The scenario, however, offered little opportunity for comparing the predictive capabilities of these two types of models because the scenario involved a near-chronic release to the atmosphere. A scenario based on an episodic release and short-term, time-dependent observations is needed to establish the overall confidence in the predictions of environmental 14C models.
Applied Radiation and Isotopes | 2008
Luigi Monte; Patrick Boyer; John E. Brittain; Nicole Goutal; R. Heling; A. Kryshev; Ivan Kryshev; Gennady Laptev; Marilyne Luck; R. Periáñez; F. Siclet; M. Zheleznyak
The paper describes the main results of the international EMRAS model testing exercise for radionuclide transport in watershed-river and estuarine systems. The exercises included the following scenarios: multi-point source of (3)H discharge into the Loire River (France), radioactive contamination of the Dnieper-Southern Boug estuary (Ukraine), remobilisation of radionuclide contamination from the Pripyat River floodplain (Ukraine) following the Chernobyl accident, release of radionuclides into the Techa River (Russia) and behaviour of (226)Ra in the Huelva estuary (Spain).
Journal of Environmental Radioactivity | 2011
T.L. Yankovich; S.B. Kim; F. Baumgärtner; D. Galeriu; A. Melintescu; Kiriko Miyamoto; M. Saito; F. Siclet; P.A. Davis
To improve understanding of environmental tritium behaviour, the International Atomic Energy Agency (IAEA) included a Tritium and C-14 Working Group (WG) in its EMRAS (Environmental Modelling for Radiation Safety) program. One scenario considered by the WG involved the prediction of time-dependent tritium concentrations in freshwater mussels that were subjected to an abrupt increase in ambient tritium levels. The experimental data used in the scenario were obtained from a study in which freshwater Barnes mussels (Elliptio complanata) were transplanted from an area with background tritium concentrations to a small Canadian Shield lake that contains elevated tritium. The mussels were then sampled over 88 days, and concentrations of free-water tritium (HTO) and organically-bound tritium (OBT) were measured in the soft tissues to follow the build-up of tritium in the mussels over time. The HTO concentration in the mussels reached steady state with the concentration in lake water within one or two hours. Most models predicted a longer time (up to a few days) to equilibrium. All models under-predicted the OBT concentration in the mussels one hour after transplantation, but over-predicted the rate of OBT formation over the next 24h. Subsequent dynamics were not well modelled, although all participants predicted OBT concentrations that were within a factor of three of the observation at the end of the study period. The concentration at the final time point was over-predicted by all but one of the models. The relatively low observed concentration at this time was likely due to the loss of OBT by mussels during reproduction.
Journal of Environmental Radioactivity | 2013
A. Melintescu; D. Galeriu; S. Tucker; Paul Kennedy; F. Siclet; K. Yamamoto; Shigeo Uchida
To improve the understanding of the environmental (14)C behaviour, the International Atomic Energy Agency (IAEA) coordinated a Tritium and C-14 Working Group (T&C WG) in its EMRAS (Environmental Modelling for Radiation Safety) programme. One of the scenarios developed in the frame of T&C WG involved the prediction of time dependent (14)C concentrations in potato plants. The experimental data used in the scenario were obtained from a study in which potatoes (Solanum tuberosum cv. Romano) were exposed to atmospheric (14)CO(2) in a wind tunnel. The observations were used to test models that predict temporal changes in (14)C concentrations in leaves at each sampling time for each experiment and (14)C concentrations in tubers at the final harvest of each experiment. The experimental data on (14)C dynamics in leaves are poorly reproduced by most of the models, but the predicted concentrations in tubers are in good agreement with the observations.
Journal of Environmental Radioactivity | 2006
Philippe Ciffroy; F. Siclet; C. Damois; Marilyne Luck
Journal of Environmental Radioactivity | 2008
Nicole Goutal; Marilyne Luck; Patrick Boyer; Luigi Monte; F. Siclet; Giacomo Angeli
Journal of Environmental Radioactivity | 2005
Philippe Ciffroy; F. Siclet; C. Damois; Marilyne Luck; C. Duboudin
Journal of Environmental Radioactivity | 2006
S.C. Sheppard; Philippe Ciffroy; F. Siclet; C. Damois; M.I. Sheppard; M. Stephenson
Journal of Environmental Radioactivity | 2006
S.C. Sheppard; M.I. Sheppard; F. Siclet