Radiation damage effects in pyrochlore and zirconolite ceramic matrices for the immobilization of actinide-rich wastes

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dc.contributor.authorLumpkin, GRen_AU
dc.contributor.authorBegg, BDen_AU
dc.contributor.authorSmith, KLen_AU
dc.date.accessioned2022-11-04T01:40:52Zen_AU
dc.date.available2022-11-04T01:40:52Zen_AU
dc.date.issued2000-07-01en_AU
dc.date.statistics2022-10-18en_AU
dc.description.abstractActinide-doping experiments using short-lived 238Pu and 244£m have demonstrated that pyrochlore and zirconolite become fully amorphous at a dose of 0.2-0.5 x 1016 cc/mg at ambient temperature and exhibit bulk swelling of 5-7%. Detailed studies of natural samples have included determination of the critical amorphization dose, long-term annealing rate, microstructural changes as a function of dose, and the thermal histories of the host rocks. Together, the laboratory based work and studies of natural samples indicate that the critical amorphization dose will increase by about a factor of 2-4 for samples stored at temperatures of 100-200 °C for up to 10 million years. These studies of alpha-decay damage have been complemented by heavy ion irradiation studies over the last ten years. Most of the irradiation work has concerned the critical amorphization dose as a function of temperature in thin films; however, some work has been carried out on bulk samples. The irradiation work indicates that most pyrochlore and zirconolite compositions will have similar critical amorphization doses at low temperatures (e.g., below 300-400 °C). Pyrochlores with Zr as the major B-site cation transform to a defect fluorite structure with increasing ion irradiation dose, but do not become amorphous.en_AU
dc.identifier.citationLumpkin, G. R., Begg, B. D., & Smith, K. L. (2000). Radiation damage effects in pyrochlore and zirconolite ceramic matrices for the immobilization of actinide-rich wastes. Paper presented at Atalante 2000: International conference on scientific research on the back-end of the fuel cycle for the 21st century, Avignon, France, 24-26 October 2000.en_AU
dc.identifier.conferenceenddate26 October 2000en_AU
dc.identifier.conferencenameAtalante 2000: International conference on scientific research on the back-end of the fuel cycle for the 21st centuryen_AU
dc.identifier.conferenceplaceAvignon, Franceen_AU
dc.identifier.conferencestartdate24 October 2000en_AU
dc.identifier.otherPaper O4-01en_AU
dc.identifier.urihttps://apo.ansto.gov.au/dspace/handle/10238/13982en_AU
dc.language.isoenen_AU
dc.publisherCommissariat à l'énergie atomique (CEA)en_AU
dc.subjectActinidesen_AU
dc.subjectAmorphous stateen_AU
dc.subjectPerformance testingen_AU
dc.subjectPhysical radiation effectsen_AU
dc.subjectPyrochloreen_AU
dc.subjectRadioactive waste storageen_AU
dc.subjectRare earthsen_AU
dc.subjectZirconoliteen_AU
dc.titleRadiation damage effects in pyrochlore and zirconolite ceramic matrices for the immobilization of actinide-rich wastesen_AU
dc.typeConference Paperen_AU
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