Step 5: Determination of peak displacement: The Bragg plane also expands in frequency space along with the intensity fading. The position of peak maxima of {110} Bragg plane in frequency space was measured for the first and last ED pattern denoted as d110i and d110f, respectively, as shown in fig. ). The total displacement of {110} plane was the difference between d110i and d110f (d110i -d110f). The position of peak maxima of {110} Bragg plane at any ED pattern is d110n, and its corresponding displacement is the difference between d110i and d110n (d110i -d110n). The relative displacement of {110} Bragg plane was measured by the ratio of (d110i -d110n) and (d110i -d110f) and plotted as a function of cumulative dose, as shown in fig. . The cumulative dose corresponding to 37 % relative displacement is considered the critical dose of the Bragg plane.