The rate of production of freely migrating defects in gamma -irradiated Ag-24 at.% Zn

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Abstract
The rate at which directional order is established in a Ag-24 at.% Zn alloy exposed to gamma rays or to 2 MeV electrons was studied by in-flux anelasticity measurements. These were performed as a function of dose rate and irradiation temperature for steady state conditions corresponding to a dynamic point defect supersaturation. Comparison of the ordering rates yielded information on the respective production rates of freely migrating defects induced by gamma photons and fast electrons. For gamma photons, the displacement cross section inferred from the results was 0.015+or-0.007 barn. An evaluation of the mean threshold energy in the alloy gave a value of 35+or-2 eV.