It has been suggested that deviations of the SIA cluster diffusion from pure 1D mode may signifi­cantly alter their interaction rate with stable sinks.2 These deviations could have different reasons, such as thermally activated changes of the Burgers vector of glissile SIA clusters, as observed in MD simulation studies for clusters of two and three SIAs. The reac­tion rate in the case has been calculated previ — ously25,27; here we present the main result only.

If tch is the mean time delay before Burgers vector change and I = J2D1D’tch is the corresponding MFP, then the reaction rate can be approximated by the following function25:

8l21/2 C

/2 Tch

which gives the correct value in the limiting case of pure 1D diffusion, when tch! 1, and a correct description of increasing reaction rate with decreasing tch. The analysis is valid for values of I larger than the mean void and dislocation capture radii, and overesti­mates reaction rates in the limiting case of 3D diffu­sion, see paragraph 6 in Barashev et a/.25 for details. Similar functional form of the reaction rate is obtained by employing an embedding procedure,27 which gives a correct description over the entire range of / in the case when voids are the dominant sinks in the system.