Abstract
An approximate scheme devised by Kiritani for the solution of a large number of rate equations describing the nucleation and growth kinetics of point defect aggregates in irradiated materials is discussed in the light of serious objections raised by Koiwa as to the validity of such a scheme. By means of calculations on the particular problem of the nucleation and growth of interstitial dislocation loops it is shown that the grouping method is a useful approximation and suggestions are made as to the best choice of parameters for its application. Since it is an approximate scheme and is being applied to very complex systems, which can only yield to numerical methods, it is pointed out that great care is required to ensure that the method is not used inappropriately.
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