Influence of gamma irradiation effects on the residual alteration rate of the French SON68 nuclear glass
| Autor: | H. Ooms, Magaly Tribet, Séverine Rolland, Christophe Jégou, Caroline Marques, Véronique Broudic, Patrick Jollivet, Pierre Toulhoat |
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| Přispěvatelé: | Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Institut National de l'Environnement Industriel et des Risques (INERIS), Institut des Sciences Analytiques (ISA), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Institut de Chimie du CNRS (INC)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS) |
| Rok vydání: | 2013 |
| Předmět: |
Nuclear and High Energy Physics
Materials science [SDE.IE]Environmental Sciences/Environmental Engineering Scanning electron microscope Sodium Kinetics Analytical chemistry chemistry.chemical_element 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences chemistry.chemical_compound Nuclear Energy and Engineering chemistry 13. Climate action Transmission electron microscopy Radiolysis General Materials Science Irradiation 0210 nano-technology Boron Hydrogen peroxide |
| Zdroj: | Journal of Nuclear Materials Journal of Nuclear Materials, 2013, 433 (1-3), pp.382-389. ⟨10.1016/j.jnucmat.2012.10.001⟩ Journal of Nuclear Materials, Elsevier, 2013, 433 (1-3), pp.382-389. ⟨10.1016/j.jnucmat.2012.10.001⟩ |
| ISSN: | 0022-3115 |
| DOI: | 10.1016/j.jnucmat.2012.10.001 |
| Popis: | The residual rate regime of SON68 nuclear glass has been investigated here by static experiments under external irradiation. The experiments were carried out in a gamma irradiator with 60 Co sources. Four dose rates were studied: two high dose rates (5 and 10 kGy h −1 ) to exacerbate electronic radiation effects, and two lower dose rates (0.8 and 0.05 kGy h −1 ). The objective of this work is not to assess potential LET effects but to assess more widely electronic effects on the residual rate regime which controls the long term stability of the glass under geological disposal. Fresh glasses were leached in argon atmosphere at 90 °C and at a high surface-area-to-volume ratio (SA/ V = 10 000 m −1 ). Under these conditions the system quickly reaches the residual alteration rate regime. The alteration rate was monitored by solution analyses: the release of glass alteration tracer elements—in particular boron, sodium and lithium—was measured by ICP-AES. The hydrogen peroxide produced by water radiolysis was quantified by chemiluminescence. Radiation effects on the glass and its gel network were characterized by scanning electron microscopy (SEM) and Transmission Electron Microscopy (TEM). Higher H 2 O 2 concentrations were measured on irradiated samples in the presence of glass, suggesting an irradiation effect on the glass and its alteration layer. However, the data obtained on glass alteration show that potential defects or changes induced by gamma irradiation do not modify the kinetics of alteration up to a gamma dose rate of 10 kGy h −1 : the residual rates measured for the different dose rates studied are similar and comparable to experiments performed without irradiation. Moreover, these observations are consistent with SEM and TEM characterizations which show that the alteration layer formed under gamma irradiation is similar to the alteration layer formed without irradiation. This study demonstrates that species produced by pure water radiolysis and defects induced by gamma irradiation in the glass and/or its alteration layer may remain limited and localized enough not to affect glass alteration under these conditions. |
| Databáze: | OpenAIRE |
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