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Enhancement of Zirconolite Dissolution Due to Water Radiolysis

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Abstract

Zirconolite is a candidate host material for conditioning minor tri- and tetra-valent actinides arising from enhanced nuclear spent fuel reprocessing and partitioning, in the case of disposal of the nuclear waste. Its chemical durability has been studied here under charged particle-induced radiolysis (He2+ and proton external beams) to identify the possible effects of water radiolysis on the dissolution rates in pure water and to describe the alteration mechanisms. Two experimental geometries have been used in order to evaluate the influence of the following parameters: solid irradiation, water radiolysis. In the first geometry the beam gets through the sample before stopping at the surface/water interface. In the second one the beam stops before the surface/water interface. Results on the elemental releases due to the enhanced dissolution of the zirconolite surface during charged particle-induced irradiation of water are presented. Under radiolysis, an increase of one order of magnitude is observed in the Ti, Zr and Nd elemental releases. No difference in the total elemental releases can be noticed when the solid is also irradiated.

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Authors and Affiliations

  1. CNRS/Universite Claude Bernard Lyon 1, Institut de Physique Nucleaire de Lyon, 4 rue Enrico Fermi, 69622, Villeurbanne, France

    Magaly Tribet, Nelly Toulhoat & Nathalie Moncoffre

  2. Commissariat à l’Energie Atomique, DEN, CEN Saclay, 91191, Gif sur Yvette cedex, France

    Nelly Toulhoat

  3. CNRS/ISA Universite Claude Bernard Lyon 1, UFR de Chimie Biochimie, 69622, Villeurbanne, France

    Pierre Toulhoat

  4. Commissariat à l’Energie Atomique, DEN/DTCD/SECM, CEN Valrho, 30207, Bagnols sur Ceze cedex, France

    Christophe Jegou & Isabelle Bardez

  5. Commissariat à l’Energie Atomique, DSM/DRECAM/LSI, Ecole Polytechnique, 91128, palaiseau, France

    Catherine Corbel

  6. Commissariat à l’Energie Atomique, DEN/DRCP/SCPS, CEN Valrho, 30207, Bagnols sur Ceze cedex, France

    Gilles Leturcq

Authors
  1. Magaly Tribet
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  2. Nelly Toulhoat
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  3. Nathalie Moncoffre
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  4. Pierre Toulhoat
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  5. Christophe Jegou
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  6. Catherine Corbel
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  7. Isabelle Bardez
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  8. Gilles Leturcq
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Tribet, M., Toulhoat, N., Moncoffre, N. et al. Enhancement of Zirconolite Dissolution Due to Water Radiolysis. MRS Online Proceedings Library 985, 904 (2006). https://doi.org/10.1557/PROC-985-0985-NN09-04

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  • DOI: https://doi.org/10.1557/PROC-985-0985-NN09-04

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