The radial averaging of the intensity of the Bragg planes is plotted in fig. (e) as a function of spatial frequency measured from the center of the diffraction pattern with increasing cumulative doses such as 1, 30, 60, and 90 e -Å -2 . The last diffraction pattern of the series is considered as the background to measure the peak intensities of the Bragg planes, i.e., 90 e -Å -2 in this case. The background-subtracted radial intensity profiles with increasing cumulative dose are plotted in fig. . Two phenomena are observed: 1. Fading of the intensity of Bragg planes, and 2. displacement of the Bragg planes or shift in the peak position as a function of cumulative dose. The peak maxima of different Bragg planes are measured, such as {110}, {200}, {400}, {211}, {222}, and {431}. The relative intensities of the {110} and {431} Bragg planes are plotted as a function of cumulative dose in fig. .