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Leaching of a zirconolite ceramic waste-form under proton and He2+ irradiation

M. Tribet 1 N. Toulhoat 1 N. Moncoffre 1 C. Jegou 2 G. Leturcq 3 C. Corbel 4 P. Toulhoat
1 IPNL - Institut de Physique Nucléaire de Lyon
2 LMPA - Laboratoire des Matériaux et Procédés Actifs
DE2D - Département de recherche sur les technologies pour l'enrichissement, le démantèlement et les déchets : DES/ISEC/DE2D
3 SCPS - Service de Chimie des Procédés de Séparation
4 SCM - Service de Chimie Moléculaire
Abstract : In the hypothesis of a nuclear waste geological disposal, zirconolite is a candidate host material for minor tri- and tetra-valent actinides arising from enhanced nuclear spent fuel reprocessing and partitioning. Its chemical durability has been studied here under charged particle-induced radiolysis (He2+ and proton external beams) to identify possible effects on dissolution rates and mechanisms in pure water. Two experimental geometries have been used to evaluate the influence of the following parameters: solid irradiation and total deposited energy. Results on the evolution of the elemental releases due to the enhanced dissolution of the zirconolite surface during charged particle-induced irradiation of water are presented. Under radiolysis, elemental releases are first kinetically controlled. When the titanium and the zirconium releases reach (or exceed) their corresponding hydroxide solubility limits, the zirconolite dissolution becomes thermodynamically controlled.
Keywords : Zirconolite Radiolysis Leaching Irradiation Deposited energy
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Journal articles
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http://hal.in2p3.fr/in2p3-00346855
Contributor : Dominique Girod <>
Submitted on : Friday, December 12, 2008 - 2:03:34 PM
Last modification on : Saturday, March 6, 2021 - 3:32:56 AM

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M. Tribet, N. Toulhoat, N. Moncoffre, C. Jegou, G. Leturcq, et al.. Leaching of a zirconolite ceramic waste-form under proton and He2+ irradiation. Radiochimica Acta, R Oldenbourg Verlag GMBH, 2008, 96, pp.619-624. ⟨10.1524/ract.2008.1545⟩. ⟨in2p3-00346855⟩

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