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An Annealing Study of Alpha-Decay Damage in Natural UO2 and ThO2

Published online by Cambridge University Press:  28 February 2011

P. J. Stout ,
G. R. Lumpkin ,
R. C. Ewing  and
Y. Eyal
P. J. Stout
Affiliation:
Department of Geology, University of New Mexico, Albuquerque, NM, 87131
G. R. Lumpkin
Affiliation:
Department of Geology, University of New Mexico, Albuquerque, NM, 87131
R. C. Ewing
Affiliation:
Department of Geology, University of New Mexico, Albuquerque, NM, 87131
Y. Eyal
Affiliation:
Department of Nuclear Engineering, Technion - Israel Institute of Technology, Haifa, 32000 ISRAEL
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Abstract

Isochronal annealing (100°–1200°C) of alpha-decay damage was performed on UO2 and ThO2 and isothermal annealing (400°C and 750°C) of UO2 was done to determine the change in unit cell parameter (UO2: ao = 5.501Å to 5.458Å ± 0.001; ThO2: ao = 5.548Å to 5.523Å ± 0.001), strain, and crystallite size (data inconclusive). Two recovery stages (UO2: Stage I at ≈225°C, Stage II at ≈675°C; ThO2: Stage I at ≈250°C, Stage II at ≈550°C) were observed for each. Strain decreased with temperature for both, but never completely recovered in either (UO2 final value: ≈2.37 × 10−3; ThO2 final value: ≈2.06 × 10−3).

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 112: Symposium P – Scientific Basis for Nuclear Waste Management XI , 1987 , 495
Copyright
Copyright © Materials Research Society 1988

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