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A new approach to the immobilisation of technetium and transuranics: Co-disposal in a zirconolite ceramic matrix

DOI: 10.1016/j.jnucmat.2019.151885 DOI Help

Authors: D. J. Bailey (University of Sheffield) , S. M. Lawson (University of Sheffield) , S. K. Sun (University of Sheffield) , M. C. Stennett (University of Sheffield) , T.-H. Lee (University of Sheffield; Pohang University of Science and Technology (POSTECH)) , B. Ravel (National Institute of Standards and Technology) , C. L. Corkhill (University of Sheffield) , J. Heo (Pohang University of Science and Technology (POSTECH)) , N. C. Hyatt (University of Sheffield)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Journal Of Nuclear Materials

State: Published (Approved)
Published: November 2019
Diamond Proposal Number(s): 17243

Abstract: Technetium and transuranic elements (TRUs) are long-lived radionuclides, produced as a result of nuclear power generation. Co-immobilisation of these radionuclides in a ceramic wasteform is attractive as they are problematic for vitrification and would reduce the demand on a future geological disposal facility. A range of zirconolite ceramics have been produced via an oxide route using the surrogates Mo and Ce with a view to the co-immobilisation of Tc and TRUs. The resultant materials were characterised by XRD, SEM-EDX, TEM and XAS. Final phase assemblage was found to be affected by target stoichiometry, the Ca precursor used, processing temperature and processing atmosphere. Through appropriate optimisation of processing conditions and target stoichiometry, the results of this study show co-immobilisation of Tc and TRUs is a promising approach.

Subject Areas: Materials, Chemistry, Environment

Instruments: B18-Core EXAFS

Added On: 25/11/2019 12:07

Discipline Tags:

Earth Sciences & Environment Radioactive Materials Ceramics Chemistry Materials Science Inorganic Chemistry

Technical Tags:

Spectroscopy X-ray Absorption Spectroscopy (XAS) X-ray Absorption Near Edge Structure (XANES)