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

Journal Article


Abstract


  • Uranium-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.

UOW Authors


  •   Carter, Melody L. (external author)
  •   Li, Hui Jun.
  •   Zhang, Yingjie (external author)
  •   Vance, E R. (external author)
  •   Mitchell, David

Publication Date


  • 2009

Citation


  • Carter, 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 99Mo production. Journal of Nuclear Materials, 384 (3), 322-326.

Scopus Eid


  • 2-s2.0-59349094446

Ro Metadata Url


  • http://ro.uow.edu.au/aiimpapers/875

Has Global Citation Frequency


Number Of Pages


  • 4

Start Page


  • 322

End Page


  • 326

Volume


  • 384

Issue


  • 3

Place Of Publication


  • North Holland

Abstract


  • Uranium-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.

UOW Authors


  •   Carter, Melody L. (external author)
  •   Li, Hui Jun.
  •   Zhang, Yingjie (external author)
  •   Vance, E R. (external author)
  •   Mitchell, David

Publication Date


  • 2009

Citation


  • Carter, 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 99Mo production. Journal of Nuclear Materials, 384 (3), 322-326.

Scopus Eid


  • 2-s2.0-59349094446

Ro Metadata Url


  • http://ro.uow.edu.au/aiimpapers/875

Has Global Citation Frequency


Number Of Pages


  • 4

Start Page


  • 322

End Page


  • 326

Volume


  • 384

Issue


  • 3

Place Of Publication


  • North Holland