Titanate ceramics for immobilisation of uranium-rich radioactive wastes arising from Mo-99 production

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dc.contributor.authorCarter, MLen_AU
dc.contributor.authorLi, HJen_AU
dc.contributor.authorZhang, YJen_AU
dc.contributor.authorVance, ERen_AU
dc.contributor.authorMitchell, DRGen_AU
dc.date.accessioned2010-04-01T04:07:55Zen_AU
dc.date.accessioned2010-04-30T05:09:03Zen_AU
dc.date.available2010-04-01T04:07:55Zen_AU
dc.date.available2010-04-30T05:09:03Zen_AU
dc.date.issued2009-02-28en_AU
dc.date.statistics2009-02-28en_AU
dc.description.abstractUranium-rich liquid wastes arising from UO2 targets which have been neutron-irradiated to generate medical radioisotopes such as 99mTc require immobilisation. A pyrochlore-rich hot isostatically pressed titanate ceramic can accommodate at least 40 wt% of such waste expressed on an oxide basis. In this paper, the baseline waste form composition (containing 40 wt% UO2) was adjusted in two ways: (a) varying the UO2 loading with constant precursor oxide materials, (b) varying the precursor composition with constant waste loading of UO2. This resulted in the samples having a similar phase assemblage but the amounts of each phase varied. The oxidation states of U in selected samples were determined using diffuse reflection spectroscopy (DRS) and electron energy loss spectroscopy (EELS). Leaching studies showed that there was no significant difference in the normalised elemental release rates and the normalised release rates are comparable with those from synroc-C. This demonstrates that waste forms based on titanate ceramics are robust and flexible for the immobilisation of U-rich waste streams from radioisotope processing. © 2009, Elsevier Ltd.en_AU
dc.identifier.citationCarter, M. L., Li, H., Zhang, Y., Vance, E. R., & Mitchell, D. R. G. (2009). Titanate ceramics for immobilisation of uranium-rich radioactive wastes arising from Mo-99 production. Journal of Nuclear Materials, 384(3), 322-326. doi:10.1016/j.jnucmat.2008.12.042en_AU
dc.identifier.govdoc1583en_AU
dc.identifier.issn0022-3115en_AU
dc.identifier.issue3en_AU
dc.identifier.journaltitleJournal of Nuclear Materialsen_AU
dc.identifier.pagination322-326en_AU
dc.identifier.urihttp://dx.doi.org/10.1016/j.jnucmat.2008.12.042en_AU
dc.identifier.urihttp://apo.ansto.gov.au/dspace/handle/10238/3023en_AU
dc.identifier.volume384en_AU
dc.language.isoenen_AU
dc.publisherElsevieren_AU
dc.subjectUraniumen_AU
dc.subjectRadioactive wastesen_AU
dc.subjectMolybdenum 99en_AU
dc.subjectTitanatesen_AU
dc.subjectCeramicsen_AU
dc.subjectSolidificationen_AU
dc.titleTitanate ceramics for immobilisation of uranium-rich radioactive wastes arising from Mo-99 productionen_AU
dc.typeJournal Articleen_AU
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