The reduced activation ferritic/martenstic steel CLF-1 prepared by the Southwest-ern Institute of Physics in China was irradiated by helium ions with an energy of 5 keV at roomtemperature using an electron cyclotron resonance(ECR)ion irradiation apparatus.After theirradiation,the helium retention and desorption were investigated using a technique of thermaldesorption spectroscopy(TDS).The experiment was conducted with both the normal and weldedsamples.Blisters were observed after the helium ion irradiation,and the surface density of blistersin the welded samples was lower than that in the non-welded samples.Three desorption peakswere observed in both the non-welded and welded samples.These desorption peaks correspondedto those of blister ruptures and the helium release from the inner bubbles and the defects.Theamount of helium retained in the welded samples was approximately the same as that in the non-welded samples,which was much less than other reduced activation materials,such as vanadiumalloy and SiC/SiC composites.
