The effect of self-interstitial cluster migration upon defect evolution in irradiated α-Fe was studied by using a kinetic Monte Carlo model, with input from ab initio and molecular dynamics calculations. Helium implantation and desorption were simulated during isothermal annealing under various conditions of temperature and sample thickness. The effect of self-interstitial cluster migration upon the fraction of He released during annealing was studied. The results of these calculations suggested a strong effect of traps in the nucleation and growth of He-vacancy clusters.

Effect of Self-Interstitial Cluster Migration on Helium Diffusion in Iron. M.J.Caturla, C.J.Ortiz: Journal of Nuclear Materials, 2007, 362[2-3], 141-5