Hostname: page-component-78c5997874-8bhkd Total loading time: 0 Render date: 2024-11-03T02:55:54.892Z Has data issue: false hasContentIssue false
  • English
  • Français

Neptunium-Doped Synroc: Partitioning, Leach Data and Secondary Phase Development

Published online by Cambridge University Press:  15 February 2011

Katherine L. Smith ,
Mark G. Blackford ,
Gregory R. Lumpkin ,
Kaye P. Hart  and
Brett J. Robinson
Katherine L. Smith
Affiliation:
Advanced Materials Program, Australian Nuclear Science and Technology Organisation, Private Mail Bag 1, Menai, NSW 2234, Australia.
Mark G. Blackford
Affiliation:
Advanced Materials Program, Australian Nuclear Science and Technology Organisation, Private Mail Bag 1, Menai, NSW 2234, Australia.
Gregory R. Lumpkin
Affiliation:
Advanced Materials Program, Australian Nuclear Science and Technology Organisation, Private Mail Bag 1, Menai, NSW 2234, Australia.
Kaye P. Hart
Affiliation:
Advanced Materials Program, Australian Nuclear Science and Technology Organisation, Private Mail Bag 1, Menai, NSW 2234, Australia.
Brett J. Robinson
Affiliation:
Advanced Materials Program, Australian Nuclear Science and Technology Organisation, Private Mail Bag 1, Menai, NSW 2234, Australia.
Get access

Abstract

Np-doped Synroc was subjected to modified MCC-1 leach tests in demineralised water at 70°C. Normalised total differential Np leach rates were about 10−4 g m−2 d−1 initially, decreased to about 10−5 g m−2 d−1 after 60 days and stayed approximately constant for periods totalling up to 2283 d. Scanning electron microscope (SEM) and analytical transmission electron microscope (AEM) examination of discs leached for periods totalling 56 d or longer showed that they were covered with crystalline anatase, brookite and ilmenite. The crystalline secondary phases initially nucleated in polishing scratches and on perovskite grains. However, after leaching for a total of 422 d most of the surface was covered. None of the secondary phases contained observable amounts of Np (< 0.2 wt%). These data are discussed in relation to previous work.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 412: Symposium V – Scientific Basis for Nuclear Waste Management XIX , 1995 , 313
Copyright
Copyright © Materials Research Society 1996

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

1 Ringwood, A. E., Kesson, S. E., Reeve, K. D., Levins, D. M. and Ramm, E. J., in Radioactive Waste Forms for the Future, edited by Lutze, W. and Ewing, R. C. (North-Holland, Amsterdam, 1988), p. 233.Google Scholar
2 Lumpkin, G. R, Smith, K. L. and Blackford, M. G., J. Mater. Res. 6, 2218–2233 (1991).Google Scholar
3 Smith, K. L., Lumpkin, G. R., Blackford, M. G., Day, R. A. and Hart, K. P., J. of Nucl. Mater. 190, 287–294 (1992).Google Scholar
4 Lumpkin, G. R., Smith, K. L. and Blackford, M. G., J. Nucl. Mater. 224, 31–42 (1995).Google Scholar
5 Blackford, M. G., Smith, K. L. and Hart, K. P., in Scientific Basis for Nuclear Waste Management XV, edited by Sombret, G. (Mater. Res. Soc. Proc. 257, Pittsburgh, PA, 1992) pp. 243–249 Google Scholar
6 Smith, K. L., Lumpkin, G. R. and Blackford, M. G., in Scientific Basis for Nuclear Waste Management XVI edited by Interrante, C. G. and Pabalan, R. T. (Mater. Res. Soc. Proc. 294, Pittsburgh, PA, 1993) pp. 129–136 Google Scholar
7 Levins, D. M., Hart, K. P., McGlinn, P. J., Lam, P., Seatonberry, B. W., Robinson, B. J., Smith, K. L., and Leung, S., 1991. Fabrication and study of Synroc containing radioactive waste elements. Ansto report ANSTO C/223, pp. 150 Google Scholar