Dose dependence of impurity detrapping stages in irradiated metals

Recently a study of the dose dependence of Cu alloyed with Ag, electron irradiated at 50 K, was performed; elsewhere, an investigation of the dose dependence of Cu alloyed with Au after thermal-neutron irradiation at 4 K was published. Both impurities lead to the same principal recovery stages (at only slightly shifted temperatures) in the stage II regime of Cu, and these recovery stages show the same dependence on the alloying concentration. It is therefore astonishing at first sight, that an opposite dose dependence has been found for the main detrapping stage (at approximately 110 K and at approximately 120 K for the Au and the Ag impurities, respectively). It is the purpose of this comment to point out that these results are not contradictory, and to discuss why and how the dose dependence of a detrapping stage may be influenced by experimental parameters as, e.g., the concentration of radiation induced defects, the irradiation temperature, the concentration of traps considered, or the concentration of other traps. (Auth.)