Editeur(s) : Nova Science Publishers
Date d'édition : 01 janvier 2007
Langue : Anglais

ISBN : 1-60021-432-0
Résumé : After generalities on the radionuclides occurring in HLW (highly radioactive liquid wastes) arising from spent nuclear fuel reprocessing and on the main characteristics and preparation methods of glassy, ceramics and glass-ceramics waste forms for the immobilization of separated or non-separated wastes, the characteristics of two categories of long-lived radionuclides (135Cs and minor actinides Np, Am, Cm) and the main matrices proposed for their specific immobilization are reviewed. Results are presented on ceramic and glass-ceramic matrices developed for the conditioning of Cs (hollandite) and minor actinides (zirconolite, zirconolite-based glass-ceramic) and studied in the laboratory of the authors. For cesium, BaxCsyTi(8-z)MzO16 hollandite ceramics (M: Al3+, Cr3+, Fe3+, Ga3+) prepared by oxide route are characterized by different methods. The effect of M on the single phase character of hollandite and on its capacity to incorporate Cs is studied. External electron irradiation experiments performed on a simple hollandite composition (Ba1.16Ti5.68Al2.32O16) to simulate the effect of -irradiation due to radioactive Cs decay are presented. Structural changes and defects formation are studied by different spectroscopic techniques such as Electron Paramagnetic Resonance (EPR). The stability with temperature of titanium (Ti3+) and oxygen (O2-) paramagnetic defects is studied. For

Site de l'Editeur :http://www.novapublishers.com

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