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Abstract
Swelling was determined in samples of single-crystal MgAl/sub 2/O/sub 4/ spinel, irradiated to doses as high as 8 x 10/sup 22/ n/m/sup 2/ (E > 0.1 MeV) at approx. =50/sup 0/C in the Omega West Reactor. Swelling effectively saturated at approx. =2 x 10/sup 22/ n/m/sup 2/ which corresponds to a damage level of only approx. =2 x 10/sup -3/ dpa. In addition subsequent measurements after irradiation have revealed that the samples continued swelling for several weeks. These results imply that irradiation defects begin to interact by recombination and aggregation at low damage levels in this material at 50/sup 0/C and perhaps continue to cluster at room temperature after irradiation. Rate equations have been employed to determine defect concentrations at saturation. Results to date show that the observed swelling is consistent with the number of surviving defects if swelling per Frenkel defect pair is taken to be one atomic volume.
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