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Microstructure, Partitioning and Dissolution Behaviour of Synroc Containing Acrinides

Published online by Cambridge University Press:  25 February 2011

M.G. Blackford ,
K.L. Smith  and
K.P. Hart
M.G. Blackford
Affiliation:
Advanced Materials Program, Australian Nuclear Science and Technology Organisation, P.M.B. 1, Menai, N.S.W., 2234, Australia
K.L. Smith
Affiliation:
Advanced Materials Program, Australian Nuclear Science and Technology Organisation, P.M.B. 1, Menai, N.S.W., 2234, Australia
K.P. Hart
Affiliation:
Advanced Materials Program, Australian Nuclear Science and Technology Organisation, P.M.B. 1, Menai, N.S.W., 2234, Australia
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Abstract

Synroc formulations containing 10 wt% simulated PW-4b type HLW in combination with a single transuranic dopant (Np, Pu, Am or Cm) were fabricated and characterised using alpha-track methods, SEM, AEM and dissolution testing. The Pu, Am and Cm-doped samples were calcined in 3.5%H2/96.5%N2. One of the Np-doped Synrocs was calcined in an atmosphere of pure H2, whilst another Np-doped Synroc was calcined in a mixture of 3.5%H2/96.5%N2. All the different formulations displayed microstructures similar to those of Synroc containing actinide-free simulated HLW. AEM derived phase compositions and phase distributions are given. All the Synrocs showed good durability when exposed to leachants (including doubly deionised water, and pH- and Eh-buffered solutions with pHs between 2 to 10). There were no obvious differences between the two Np-doped samples. The improved appearance and behaviour of allthe Synrocs in this study compared with similar formulations described by other authors is attributed to improved mixing techniques during fabrication.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 257: Symposium – Scientific Basis for Nuclear Waste Management XV , 1991 , 243
Copyright
Copyright © Materials Research Society 1992

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References

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