Auswahl der wissenschaftlichen Literatur zum Thema „Substances radioactives – Environnement“
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Dissertationen zum Thema "Substances radioactives – Environnement"
Gressier, Frédéric. „Etude de la rétention des radionucléides dans les résines échangeuses d'ions des circuits d'une centrale nucléaire à eau sous pression“. Paris, ENMP, 2008. http://pastel.archives-ouvertes.fr/pastel-00004851.
Der volle Inhalt der QuellePhysico-chemical quality of fluids flowing through the circuits of nuclear power plants must be maintained in order to limit circuits contamination and to diminish the dose rate associated to shutdowns. Nevertheless, an optimum between limiting liquid waste and limiting the production of solid waste has to be achieved, in the same time that limiting the associated costs. This is achieved by ion-exchange resins contained in purification circuits. A literature review has put in light the advantages and the drawbacks of the major models of interest proposed to simulate the operating of resins. Thus, the non-ideality of the resin phase has been modelled by the regular solution model whereas ion-exchange kinetics has been described by mass transfer coefficients. Selectivity variations of two cation-exchange resins for Co2+, Ni2+, Cs+ et Li+ ions has been demonstrated. This variation depends on the global saturation state of the resin. Moreover, the more the flow rate, the more the ionic leakage and the more the spreading of elution fronts. The implementation of these models in the CHESS and HYTEC codes has enabled to simulate the equilibrium and kinetics experiments so as to parametrize these new models. Finally, the predicted impact of selectivity variations and hydrokinetics has been studied on a few test cases so as to demonstrate the importance of taking into account these phenomena when modelling the operation of ion-exchange resins
Panza, Fabien. „Développement de la spectrométrie gamma in situ pour la cartographie de site“. Electronic Thesis or Diss., Strasbourg, 2012. http://www.theses.fr/2012STRAE043.
Der volle Inhalt der QuelleThe high-resolution gamma spectrometry currently provides a powerful analytical tool for performing environmental measurements. In the context of radiological characterization of a site (natural or artificial radioactivity) and for the dismantling of nuclear installations, mapping of radionuclides is an important asset. The idea is to move a HPGe spectrometer to study the site and from nuclear and position data, to identify, to locate and to quantify the radionuclides present in the soil. The development of this tool follows an intercomparaison (ISIS 2007) where an intervention / crisis exercise showed the limits of current tools. The main part of this research project has focused on mapping of nuclear data. Knowledge of the parameters of an in situ spectrum helped to create a simulator modeling the response of a spectrometer moving over contaminated soil. The simulator itself helped to develop algorithms for mapping and to test them in extreme situations and not realizable. A large part of this research leads to the creation of a viable prototype providing real-time information concerning the identity and locality as possible radionuclides. The work performed on the deconvolution of data can make in post processing a map of the activity of radionuclide soil but also an indication of the depth distribution of the source. The prototype named OSCAR was tested on contaminated sites (Switzerland and Japan) and the results are in agreement with reference measurements
Crançon, Pierre. „Migration de l'uranium dans un podzol : le rôle des colloïdes dans la zone non saturée et la nappe : application aux landes de Gascogne“. Phd thesis, Grenoble 1, 2001. http://www.theses.fr/2001GRE10006.
Der volle Inhalt der QuellePanza, Fabien. „Développement de la spectrométrie gamma in situ pour la cartographie de site“. Phd thesis, Université de Strasbourg, 2012. http://tel.archives-ouvertes.fr/tel-00975929.
Der volle Inhalt der QuelleBücher zum Thema "Substances radioactives – Environnement"
Nuclear juggernaut: The transport of radioactive materials. London: Earthscan, 2009.
Den vollen Inhalt der Quelle findenC, Millington A., und Townshend John, Hrsg. Biomass assessment. London: Earthscan, 2009.
Den vollen Inhalt der Quelle findenAgenda 21 Earth Summit: United Nations Program of Action from Rio. United Nations, 1992.
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