The point defect structure of individual depleted zones (DZs) created by a variety of different projectile ions, with energies in the range 15-90 keV, was studied employing the field-ion microscope technique [1-9]. The irradiations were performed in situ at a temperature of less than. 15 K in the case of tungsten and 40 K for platinum. The fluence was always less then 1013 ions cm-2, so that each depleted zone detected was created by a single energetic projectile ion. The following variables were studied: (1) the effect of varying the initial energy of the projectile ion at constant projectile mass; (2) the effect of varying the projectile mass at constant initial energy of the projectile ion; and (3) the non-linear effects produced by employing dimer ions (W+2 and Ag+2). The analyses of the depleted zones consisted of measuring and/or determining the following quantities: (1) the number of vacancies per DZ; (2) the spatial distribution of self-interstitial atoms around the DZs in the case of tungsten; (3) the dimensions of the DZs; (4) the vacancy concentration per DZ; (5) the radial distribution function of the vacancies within each DZ; (6) the radiation damage profiles due to the cumulative effects of many DZs; and (7) the non-linear effects produced by the dimer irradiations. The results are discussed and compared with different analytical theories and computer simulations of the primary state of radiation damage.
ASJC Scopus subject areas
- Nuclear and High Energy Physics
- Materials Science(all)
- Nuclear Energy and Engineering