THE NEW PARAMETER SENSITIVE TO THE TYPE OF A PROFILE IN THE DIFFUSIONZONE

The coordinate dependence of the ratio (6,122)J = (6) Y/(122) Y of the radiation components of Co-57 localized in diffusion zones of polycry stalline Au and W was examined theoretically and experimentally. Here Y is the radiation intensity of the residual polycrystal. It is shown that among all the known characteristics of the intercrystallite diffu sion (ICD) the ratio (6,122)J represents a parameter, which is most se nsitive to the type of the atomic probes profile in the diffusion zone . The increase in the ratio (6,122)J with the depth in the diffusion z one is a unique criterion of the Gaussian profile (for the volume diff usion or the ICD in a single crystallite conjugation region in the 'C- regime'). The decrease in the ratio (6,122)J with increasing depth in the ICD zone in a polycrystal is due to the manifestation of the cryst allite conjugation regions distribution function G(D-CCR(-1)) on the r eciprocal values of the diffusion coefficients D-CCR(-1) in the crysta llite conjugation region core. A complicated behavior of the ratio (6, 122)J in the diffusion zone of Co-57 in polycrystallite Au after a hig h-temperature annealing is due to the dominance of different types of profiles in various parts of the diffusion zone. (C) 1998 Elsevier Sci ence B.V. All rights reserved.