Positron-lifetime study of copper irradiated byd-T fusion neutrons

Positron-lifetime characteristics have been investigated for samples of pure annealed copper irradiated by $d$-T fusion neutrons to a fluence of 5 × ${10}^{16}$ n/${\mathrm{cm}}^2$. It is found that the general characteristics of the data are similar to those obtained from proton irradiation under similar circumstances. While there are minor differences in the dose dependence, trap lifetime, and recovery between the two irradiations, there is quantitative agreement between the trapping-rate data and calculated damage production when damage from recoils below 50 keV is excluded.