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Registros recuperados: 12
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An operational model to simulate post-accidental radionuclide transfers in Toulon marine area: preliminary development ArchiMer
Duffa, Celine; Dufois, Francois; Coudray, Sylvain.
As part of its development of post-accident management tools, the French Institute for Radiological Protection and Nuclear Safety is setting up a model to simulate radionuclide dispersion in the Toulon marine area (one of France's main military ports). The model is based on the MARS 3D code developed by IFREMER. It reproduces hydro-sedimentation phenomena in the Bay of Toulon with a horizontal spatial resolution of 100 m and 30 vertical sigma levels and also factors in radioactive decay and dissolved/particulate distribution of the radionuclides studied. With no tide, the major currents in this area are generated by the wind. The model effectively reproduces the resulting hydrodynamic phenomena, which were measured throughout the summer of 2009 in the...
Tipo: Text Palavras-chave: Bay of Toulon; Radionuclides; Dispersion; MARS.
Ano: 2011 URL: http://archimer.ifremer.fr/doc/00053/16465/15998.pdf
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Assessment of the exposure pathway in the uptake and distribution of americium and cesium in cuttlefish (Sepia officinalis) at different stages of its life cycle ArchiMer
Bustamante, Paco; Teissier, J.l; Warnau, M.
Laboratory radiotracer experiments were performed to study the uptake, assimilation and retention of americium (241Am) and cesium (134Cs) by the common cuttlefish Sepia officinalis. Uptake and loss kinetics of the radionuclides were measured following exposure through sediments, seawater and food at different stages of the animal's life cycle. Sediment was found to be a minor uptake pathway for both radionuclides in juveniles. Following a short seawater exposure, cuttlefish accumulated 241Am and 134Cs, but only to a limited extent (whole-body CF < 2). Among the cuttlefish organs, branchial hearts and their appendages displayed the highest degree of uptake for 241Am (CF = 42 and 16, respectively), but these tissues contained low percentage of total 241Am...
Tipo: Text Palavras-chave: Retention; Radionuclides; Cephalopods; Biokinetics; Accumulation.
Ano: 2006 URL: http://archimer.ifremer.fr/doc/2006/publication-1872.pdf
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Bioturbation at the water-sediment interface of the Thau Lagoon: impact of shellfish farming ArchiMer
Schmidt, Sabine; Gonzalez, Jean-louis; Lecroart, Pascal; Tronczynski, Jacek; Billy, Isabelle; Jouanneau, Jean-marie.
Quantifier les processus de remaniement sédimentaire procure une vision nouvelle du fonctionnement des écosystèmes benthiques de l'étang de Thau, lieu d'une importante production ostréicole. Afin d'évaluer les taux de bioturbation des sédiments de surface, des profils de deux traceurs radioactifs, le béryllium 7Be (T1/2 = 53 jours) et le thorium 234Th (T1/2 = 24.1 jours) ont été mesurés à partir de carottes sédimentaires prélevées entre décembre 2001 et décembre 2006. La sélection de plusieurs sites a permis de couvrir la diversité de l'étang de Thau : C4, T10, et T11 dans le bassin central, C5, T7 et T8 au niveau des secteurs ostréicoles, T2 et T4 à l'ouest du bassin, et T12 à l'est près de la zone industrielle. Le 234Th en excès (234Thxs ; i.e. apporté...
Tipo: Text Palavras-chave: Mediterranean Lagoon; Radionuclides; Biodeposition; Sedimentation.
Ano: 2007 URL: http://archimer.ifremer.fr/doc/2007/publication-2584.pdf
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Content of 137Cs, 40K, 90Sr, 210Po radionuclides and some chemical pollutants in the Black Sea mussels, Mytilus galloprovincialis Lam. IBSS Repository
Egorov, V. N.; Lazorenko, G. E.; Mirzoeva, N. Yu.; Stokozov, N. A.; Kostova, S. K.; Malakhova, L. V.; Pirkova, V.; Arkhipova, S. I.; Korkishko, N. F.; Popovichev, V. N.; Plotitsyna, O. V.; Migal, L. V..
The concentrations of 137Cs, 40K, 90Sr, 210Ро radionuclides, mercury and polychlorbiphenyls were determined in the Black Sea mussels collected in four different areas of the Crimean coast depending on places of sampling, the shell length of mollusks and the stages of their gonads development. The study was carried out in the framework of CIESM “Mussel Watch” Programme.
Tipo: Journal Contribution Palavras-chave: Radionuclides; Mercury; Polychlorbiphenyls; The Black Sea mussels; The Crimean coast; Радионуклиды; Полихлорбифенилы; Ртуть; Черноморские мидии; Побережье Крыма Mercury Mercury http://aims.fao.org/aos/agrovoc/c_4751.
Ano: 2006 URL: http://repository.ibss.org.ua/dspace/handle/99011/295
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Contrasting bioaccumulation and transport behaviour of two artificial radionuclides (Am-241 and Cs-134) in cuttlefish eggshell ArchiMer
Bustamante, Paco; Teyssie, J; Fowler, S; Warnau, M.
Radionuclide experiments were performed to study the accumulation, retention and transport of Am-241 and Cs-134 in egos of the common cuttlefish Sepia officinalis. Experiments were designed to determine the processes controlling uptake of both radionuclides following, exposure via seawater. The bioaccumulation of both radionuclides displayed saturation kinetics with steady state in uptake being reached in 10 d for Am-241 and 6 d for (CS)-C-134. Am-241 was readily taken up by the eggs which reached a concentration factor (CF) of 20 after 10 d of exposure. During embryonic development. the eggshell acted as an effective shield against Am-241 penetration with 98% of the radionuclide associated with this membrane. In contrast. (CS)-C-134 was transported across...
Tipo: Text Palavras-chave: Cephalopods; Bioaccumulation; Biokinetics; Radionuclides.
Ano: 2006 URL: http://archimer.ifremer.fr/doc/2006/publication-1871.pdf
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Cs-137 baseline levels in the Mediterranean and Black Sea: A cross-basin survey of the CIESM Mediterranean Mussel Watch programme ArchiMer
Thebault, Herve; Baena, A; Andral, Bruno; Barisic, D; Albaladejo, J; Bologa, A; Boudjenoun, R; Delfanti, R; Egorov, V; Khoukhi, T; Florou, H; Kniewald, G; Noureddine, A; Patrascu, V; Pham, M; Scarpato, A; Stokozov, N; Topcuoglu, S; Warnau, M.
The common mussel Mytilus galloprovincialis was selected as unique biomonitor species to implement a regional monitoring programme, the CIESM Mediterranean Mussel Watch (MMW), in the Mediterranean and Black Seas. As of today, and upon standardization of the methodological approach, the MMW Network has been able to quantify Cs-137 levels in mussels from 60 coastal stations and to produce the first distribution map of this artificial radionuclide at the scale of the entire Mediterranean and Black Seas. While: measured Cs-137 levels were found to be very low (usually <1 Bq kg(-1) wet wt) Cs-137 activity concentrations in the Black Sea and North Aegean Sea were up to two orders of magnitude higher than those in the western Mediterranean Basin. Such effects,...
Tipo: Text Palavras-chave: Black Sea; Mediterranean; Mussel watch; Monitoring; Radionuclides; Bivalves.
Ano: 2008 URL: http://archimer.ifremer.fr/doc/2008/publication-4477.pdf
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(CS)-C-137 inventory in sediment near the Rhone mouth: role played by different sources ArchiMer
Charmasson, S.
The low tidal range of the Mediterranean Sea and the high sediment load of the Rhone induce the formation of an important submarine delta. The Cs-137 inventory in sediment on a 480 km(2) area near the Rhone mouth reached 19.6 TBq in 1990. The spatial distribution of both sediment accumulation rates and (CS)-C-137 concentrations in this area confirm the existence of a spatially well-delimited zone, i.e. the prodelta, where both parameters are the highest. Thus, 40% of the total amount of Cs-137 stored in this 480 km(2) area was found within the prodelta (30 km(2)) in the close vicinity of the river mouth. This attests to the efficiency of the (CS)-C-137 trapping by the prodelta sediments. A study on the part the different (CS)-C-137 sources in the...
Tipo: Text Palavras-chave: Rhône; Méditerranée; Radioéléments; Sédiment; Inventaire; Rhone; Mediterranean Sea; Radionuclides; Sediment; Inventory.
Ano: 2003 URL: http://archimer.ifremer.fr/doc/00321/43266/42997.pdf
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Etude du comportement des éléments traces en milieu estuarien : approche expérimentale et modélisation : Application à l'étude de la spéciation de Cd, Co et Cs dans les estuaires majeurs français (Seine, Loire, Gironde, Rhône) ArchiMer
Dange, Catherine.
Most of trace elements have a non conservative behavior in estuarine environments. It is the case of cadmium, cobalt and caesium for which the fate in estuarine and coastal zones is largely controlled by their distribution between water and suspended particles, which generally have high residence times or can be definitely deposited in these areas. Metallic contaminants and radionuclides can be present under various species : dissolved (mineral and organic complexes), colloidal and particulate forms (adsorbed, precipitated) or integrated by various mechanisms in the organisms. Such distributions are the result of processes (physical, chemical, biological) which are controlled by many factors (ionic strengh, pH, Eh, major cations concentration, nature and...
Tipo: Text Palavras-chave: Modeling; French estuaries; Caesium; Cobalt; Cadmium; Radionuclides; Trace metals; Speciation; Modélisation; Estuaires français; Cesium; Cobalt; Cadmium; Radionucléides; Métal trace; Speciation.
Ano: 2002 URL: http://archimer.ifremer.fr/doc/2002/these-183.pdf
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Modélisation du transport particulaire dans le Golfe du Lion en vue d'une application au devenir des traceurs radioactifs issus du Rhône ArchiMer
Dufois, Francois.
Among the contaminants introduced into the environment, the artificial radionuclides appear particularly important to take into account because of their chemical toxicity and/or of their radiotoxicity. Some radionuclides present a high affinity with particles so that the study of the sediment dynamics is a useful preliminary to the study of their dispersion on the open sea. This thesis is focused on the fate of sediments in the Gulf of Lions (NW Mediterranean) and in particular on the impact of the Rhone River, which is the main source of particulate matter in the Gulf of Lions. In order to study the sediment transport mechanisms on various space and time scales, this thesis is based on mathematical modelling. The hydro-sedimentary model set up in the Gulf...
Tipo: Text Palavras-chave: Waves; MARS 3D; Hydrodynamic; Radionuclides; Modelling; Sediment; Rhône prodelta; Gulf of Lions; Vagues; MARS 3D; Hydrodynamique; Radioéléments; Modélisation; Sédiment; Prodelta du Rhône; Golfe du Lion.
Ano: 2008 URL: http://archimer.ifremer.fr/doc/2008/these-6308.pdf
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Nature and rates of fine-sedimentation on a mid-shelf: "La Grande Vasiere" (Bay of Biscay, France) ArchiMer
Dubrulle, C; Jouanneau, J; Lesueur, P; Bourillet, Jean-francois; Weber, O.
The study area, "La Grande Vasiere" (LGV), stretches out on the French Atlantic continental shelf (at ca. 100 m water depth), along 250 km from the Glenan Islands at the north to the southwest of Rochebonne at the south. Box-cores were sampled in this mid-shelf area during four cruises in June 1995, and in April, June and September 2002. They were investigated using sedimentologicat approaches (X-radiographs and grain-size analyses) and radionuclide studies (Pb-210 geochronology and excess Th-234). The main results are: (1) the surficial sediments are generally organized into a decimetrescale fining up sequence which can be the result of extreme storms; (2) an upper mixing layer of 7-20cm reflects an important biological benthic activity and/or the impact...
Tipo: Text Palavras-chave: Bay of Biscay; Continental shelf; Sedimentation rate; Radionuclides; Fine sediment fraction; Mud.
Ano: 2007 URL: http://archimer.ifremer.fr/doc/2007/publication-3539.pdf
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TRANSMER, hydrodynamic model for medium- and long-term simulation of radionuclides transfers in the English Channel and southern North Sea ArchiMer
Bailly Du Bois, Pascal; Dumas, Franck.
TRANSMER hydrodynamic model simulates dispersion of dissolved substances in seawater at the scale of the English Channel and the south of the North Sea with a mesh size of one kilometre and a time step of 30 minutes. This model evaluates the medium- and long-term consequences of releases of soluble pollutants in the marine ecosystem under normal or accidental conditions, at a very low computation cost (it takes less than one hour to simulate one year). It has been qualitatively and quantitatively validated by 1400 measurements of 125Sb in seawater in the English Channel and the North Sea. Budgets of measured and simulated radionuclide quantities are balanced for theses seas. The correlation factor between individual measurements in seawater and calculation...
Tipo: Text Palavras-chave: Pollutant; Ecosystem; Radionuclides; Dispersion; Dissolved substances; Hydrodynamic model.
Ano: 2005 URL: https://archimer.ifremer.fr/doc/2005/publication-552.pdf
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Радиоэкологический отклик Черного моря на Чернобыльскую ядерную аварию в отношении долгоживущих радионуклидов 90Sr и 137Cs IBSS Repository
Егоров, В. Н.; Поликарпов, Г. Г.; Освас, И.; Стокозов, Н. А.; Гулин, С. Б.; Мирзоева, Н. Ю..
Исследованы потоки поступления 90Sr и 137Cs в Черное море после аварии на Чернобыльской АЭС, их миграции между компонентами экосистем, выполнены расчеты дозовых нагрузок на морские организмы за послеаварийный период, а также оценка и прогноз времени пребывания этих радионуклидов в водной среде. Получено, что время поступления 137Cs в Черное море превысит 35 лет, а количество 137Cs составит 1740 – 2440 ТБк, или 1.7 – 6.6 % от практически полного его поступления в окружающую среду из аварийного реактора ЧАЭС. Прогнозируемое поступление 90Sr в Черное море будет продолжаться свыше 70 лет, его количество за этот период составит 305 – 505 ТБк, или 3.7 – 38.8 % от его общего количества, инжектированного в окружающую среду после аварии на ЧАЭС. Вынос 137Cs...
Tipo: Journal Contribution Palavras-chave: Черное море; Радиоэкология; Радионуклиды; Миграция; Потоки; Дозовые нагрузки; Прогноз; Radionuclides; Migration; Outflow; Dose commitments; Prediction Migrations Outflow Prediction Prediction http://aims.fao.org/aos/agrovoc/c_29367.
Ano: 2002 URL: http://repository.ibss.org.ua/dspace/handle/99011/25
Registros recuperados: 12
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