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Over the years, a considerable amount of experimental results have been reported on defect accumulation in low-dose neutron irradiated pure fcc metals. In an effort to further the understanding of the processes involved in the defect accumulation in the transient regime, the experimental results are compiled and the salient features of these results are pointed out. Experimental results in pure aluminium, copper and nickel are chosen for this review. The dose dependence of the experimentally measured parameters makes it abundantly clear that the rate of build-up of cluster density, cavity density and the void swelling reaches a maximum at very low doses (≤ 0.1 dpa). There is no experimental evidence for the formation of a well defined dislocation network during irradiation of pure metals at temperatures in the void swelling regime up to a dose level of ~ 1 dpa. The experimental results allow us to identify three …