The initial kinetics for the migration of interstitial impurity atoms to a distribution of small dislocation loops has been evaluated and compared with the measured kinetics of Stage III recovery in neutron-irradiated niobium containing oxygen impurity. Both the theoretical calculation and the relevant electrical-resistivity measurements are presented. The agreement is very good and provides strong support for the assumption that the Stage III recovery is due to the migration of oxygen to the dislocation loops introduced by the irradiation.
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