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The Effect of Radiation Damage on Zirconolite Dissolution

Published online by Cambridge University Press:  11 February 2011

Katherine L. Smith ,
Zhaoming Zhang ,
Peter McGlinn ,
Darren Attard ,
Huijing Li ,
Gregory R. Lumpkin ,
Michael Colella ,
Terry McLeod ,
Zaynab Aly  and
Elaine Loi
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Katherine L. Smith
Affiliation:
Materials Division, Australian Nuclear Science and Technology Organisation, Private Mail Bag 1, Menai, NSW 2234, Australia.
Zhaoming Zhang
Affiliation:
Materials Division, Australian Nuclear Science and Technology Organisation, Private Mail Bag 1, Menai, NSW 2234, Australia.
Peter McGlinn
Affiliation:
Materials Division, Australian Nuclear Science and Technology Organisation, Private Mail Bag 1, Menai, NSW 2234, Australia.
Darren Attard
Affiliation:
Materials Division, Australian Nuclear Science and Technology Organisation, Private Mail Bag 1, Menai, NSW 2234, Australia.
Huijing Li
Affiliation:
Materials Division, Australian Nuclear Science and Technology Organisation, Private Mail Bag 1, Menai, NSW 2234, Australia.
Gregory R. Lumpkin
Affiliation:
Materials Division, Australian Nuclear Science and Technology Organisation, Private Mail Bag 1, Menai, NSW 2234, Australia.
Michael Colella
Affiliation:
Materials Division, Australian Nuclear Science and Technology Organisation, Private Mail Bag 1, Menai, NSW 2234, Australia.
Terry McLeod
Affiliation:
Materials Division, Australian Nuclear Science and Technology Organisation, Private Mail Bag 1, Menai, NSW 2234, Australia.
Zaynab Aly
Affiliation:
Materials Division, Australian Nuclear Science and Technology Organisation, Private Mail Bag 1, Menai, NSW 2234, Australia.
Elaine Loi
Affiliation:
Materials Division, Australian Nuclear Science and Technology Organisation, Private Mail Bag 1, Menai, NSW 2234, Australia.
Sammy Leung
Affiliation:
Materials Division, Australian Nuclear Science and Technology Organisation, Private Mail Bag 1, Menai, NSW 2234, Australia.
Kaye P. Hart
Affiliation:
Materials Division, Australian Nuclear Science and Technology Organisation, Private Mail Bag 1, Menai, NSW 2234, Australia.
Mark Ridgway
Affiliation:
Research School of Physical Sciences, The Australian National University, Canberra, ACT 0200, Australia.
William J. Weber
Affiliation:
Pacific Northwest National Laboratory, Richland, WA 99352, USA.
Suntharampillai Thevuthasan
Affiliation:
Pacific Northwest National Laboratory, Richland, WA 99352, USA.
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Abstract

Polished tiles (7×7×2 mm3) of Nd-bearing zirconolite were fabricated and then some were irradiated on both large faces with 3 MeV or 2 MeV Au2+ ions (total fluence of ≥ 1 × 1015 ions/cm2) in order to render the zirconolite amorphous and so simulate displacement damage caused by alpha decay. Both the irradiated and non-irradiated tiles were then subjected to static dissolution tests in 0.01M nitric solution (pH2) at 90 C, for periods of 0–1, 1–7, 7–14 and 14–28 days. It was found that radiation damage did not affect the dissolution rate of zirconolite as indicated by the elemental leach rates of Nd, Ti, Ca and Al. The results of solution analyses are consistent with those obtained from X-ray Photoelectron Spectroscopy (XPS) in that the Ca, Nd, Ti and Al concentrations in the top surface layer (< 5 nm) all decreased with respect to that of Zr after dissolution testing, and the leached surface composition of the non-irradiated zirconolite is very similar to that of the two irradiated specimens. The implications of these results are discussed in the context of previous work.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 757: Symposium II – Scientific Basis for Nuclear Waste Management XXVI , 2002 , II6.12
Copyright
Copyright © Materials Research Society 2003

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References

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