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The incorporation of actinide elements and their rare-earth element analogues in titanate nuclear waste forms is reviewed. New partitioning data are presented for three waste forms containing Purex waste simulant in combination with either NpO(2), PuO(2) or Am(2)O(3). The greater proportion of transuranics partition between perovskite and zirconolite, while some americium may enter loveringite. Autoradiography has revealed clusters of plutonium atoms which have been interpreted as unreacted dioxide or sesquioxide. It is concluded that the solid-state behaviour of transuranic elements in titanate waste forms is not understood well enough to tailor a ceramic for the incorporation of waste from reprocessing of fast breeder reactor fuel, in which transuranic species are more abundant than in Purex waste.

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Authors: MATZKE H-J, JRC Karlsruhe (DE);RAY I L F, JRC Karlsruhe (DE);THIELE H ET AL., JRC Karlsruhe (DE);SEATONBERRY B W, Australian Nuclear Science and Technology Organisation, Menai, New South Wales (AU);WHITE T J, The University of Melbourne, Melbourne (AU)
Bibliographic Reference: Article: Journal of the American Ceramic Society, Vol. 73 (1990) No. 2, pp. 370-378
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