Literatura científica selecionada sobre o tema "Isotopes de l’uranium"
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Artigos de revistas sobre o assunto "Isotopes de l’uranium"
Bigot, Laurent. "La technologie de l’enrichissement de l’uranium au service de la production d’isotopes stables". Revue Générale Nucléaire, n.º 6 (novembro de 2020): 36–37. http://dx.doi.org/10.1051/rgn/20206036.
Texto completo da fontePourcelot, L., B. Boulet e C. Cossonnet. "Contribution des isotopes de l’uranium à l’expertise des sources de ce radioélément dans l’environnement". Radioprotection 46, n.º 3 (julho de 2011): 345–58. http://dx.doi.org/10.1051/radiopro/2011110.
Texto completo da fontePourcelot, L., B. Boulet e N. Cariou. "Utilisation des isotopes de l’uranium et du rapport U/Th pour évaluer le marquage des végétaux consécutif aux rejets d’uranium des installations du cycle du combustible". Radioprotection 50, n.º 3 (julho de 2015): 209–14. http://dx.doi.org/10.1051/radiopro/2015008.
Texto completo da fonteCazoulat, A., P. Bérard e P. Laroche. "Risques liés à l’uranium appauvri en isotope 235". EMC - Pathologie professionnelle et de l 'environnement 7, n.º 3 (julho de 2012): 1–9. http://dx.doi.org/10.1016/s1155-1925(12)58370-9.
Texto completo da fonteTeses / dissertações sobre o assunto "Isotopes de l’uranium"
Lefebvre, Pierre. "Évolution à long terme de la spéciation et de la mobilité de l’uranium dans les sédiments et les sols : processus naturels d'enrichissement en uranium dans le bassin versant du Lac Nègre". Electronic Thesis or Diss., Sorbonne université, 2021. http://www.theses.fr/2021SORUS292.
Texto completo da fonteUnderstanding the geochemical behavior of uranium (U) in the environment is crucial for the limitation of U dissemination in contaminated systems. The primary objective of this thesis was to determine the potential evolution of noncrystalline U phases over thousand years in naturally U-rich lacustrine sediments (up to more than 1000 µg/g) from Lake Nègre, in the Mercantour-Argentera Massif (South-East France). Using U isotopic ratios (δ238U and (234U/238U)) and U L3-edge X-ray absorption spectroscopy (XAS), we show that U is first deposited as organic-bound mononuclear species and is readily reduced to U(IV). In less than 700 years, these species transform into U(IV)-silica polymers with a local structure close to that of coffinite (USiO4·nH2O). This transformation highlights the role of ligand abundance in limiting the precipitation of crystalline U phases, but only slightly reduces the lability of uranium which potential mobility remains significant even after several thousand years. At the watershed scale, U originates from fractures in the granitic bedrock and is subsequently scavenged in the soils, especially in the wetland upstream of the lake (up to > 5000 µg/g), before being transported through erosion. Uranium scavenging in the soils occurs through complexation by organic matter including particular biological structures, followed by partial reduction to U(IV). U is thus mainly present in mononuclear species but also in polymeric U(VI) phases which may potentially result from U aging after thousand years of accumulation
Jaegler, Hugo. "Redistribution des isotopes de l’uranium et du plutonium présents à l’état d’ultra-traces dans les sédiments des fleuves côtiers drainant le panache radioactif de Fukushima". Thesis, Université Paris-Saclay (ComUE), 2018. http://www.theses.fr/2018SACLS288/document.
Texto completo da fonteThe 2011 Fukushima Dai-ichi accident led to the deposition of uranium and plutonium at ultra-trace levels on coastal catchments in northeastern Japan, in addition to the natural uranium and plutonium from the global fallout of the atmospheric nuclear tests, already present before the accident. The relative contribution of these different sources can be quantified from the precise measurement of their isotopic composition and the precise determination of local isotopic signatures prior to the accident through the compilation of literature data and the analysis of a sediment core collected in a dam reservoir. Furthermore, the analysis of soil samples collected after 2011 shows that the spatial distribution of initial plutonium deposits is roughly similar to that of radiocaesium. In addition, if the presence of uranium originating from the plant was not confirmed, the plutonium rejected by the accident was identified and quantified in all the river sediment samples analyzed, showing that the plutonium originating from the plant is more quickly exported to the Pacific Ocean than that originating from the global atmospheric tests. In addition, plutonium bearing micro particles were localized and then precisely characterized (size, morphology, chemical composition). Overall, this work provided original data on the fate of actinides in the Fukushima environment
Harguindéguy, Stéphanie. "Transport de l’uranium dans les eaux et le sol : approche combinée colloïdale et isotopique". Thesis, Pau, 2013. http://www.theses.fr/2013PAUU3043/document.
Texto completo da fonteMechanisms of interaction between uranium and colloids were studied by samples taken from a site of interest for the “French Nuclear Agency” (CEA). The mobilization of uranium from soils was apprehended by static and dynamic leaching experiments. The transfer and transport have been studied by considering pondwaters and drainwaters. Results confirm that anthropogenic uranium is more mobile than natural uranium. However mechanisms of mobilization and distribution of uranium, does not differ depending on its origin. The colloidal fraction plays an important role on the migration in soil and the transfer into water by representing from 10 to 90 % uranium depending on samples. The colloidal fractions of uranium are in a continuum of size up to about 200 nm hydrodynamic diameter. They are mainly composed of organic material, iron and aluminum. Along the drain, from the upstream to the downstream of the site, rearrangement of colloidal associations between uranium and organic material occurs in disfavor of colloidal associations between uranium and iron, the proportion of colloidal uranium bound to aluminum remains unchanged
Bosia, Clio. "Les séries radioactives de l'uranium dans les sédiments de la Gandak (Himalaya) : de la roche total aux analyses in situ sur les minéraux séparés". Thesis, Strasbourg, 2016. http://www.theses.fr/2016STRAH003/document.
Texto completo da fonteThe analysis of total sediments and grain-size fractions from the Gandak river (Himalaya) showed that the Uranium series variability observed for the Himalayan sediments is controlled by their mineralogical and grain-size evolution, rather than by the weathering process.This conclusion called into question the transfer timescale in Himalayan plains estimated by previous works and highlighted the need to explore radionuclide mobility at the mineral scale. For this purpose, an approach on pure mineral fractions pointed out exchange processes between the mineral phases, with a significant mobility of 230Th, strongly depleted in zircon, and 226Ra, particularly enriched in the clay fraction. The observed disequilibria are attributed to a recent weathering process of a few ky. Those observations are confirmed by the SIMS analysis of 238U-234U-230Th disequilibria on mineral grains, which show a 230Th enrichment at the grain surface in monazites and a loss of Th, 230 and 232, in zircons
Capítulos de livros sobre o assunto "Isotopes de l’uranium"
"5. Datation des coraux et autres échantillons géologiques par le déséquilibre entre les isotopes de l’uranium et du thorium". In Paléoclimatologie, 113–36. EDP Sciences, 2020. http://dx.doi.org/10.1051/978-2-7598-1151-9-009.
Texto completo da fonte"5. Datation des coraux et autres échantillons géologiques par le déséquilibre entre les isotopes de l’uranium et du thorium". In Paléoclimatologie, 113–36. EDP Sciences, 2020. http://dx.doi.org/10.1051/978-2-7598-1151-9.c009.
Texto completo da fonte