The plot of minimum viscosity (at shear rate 30/s) attained by the sample while subjecting it to shear from 1 to 30/s for (a) CMG D.S. = 0.1 and (b) 0.2, (c) HEG M.S. = 0.1 and (d) 0.2, and (e) MG D.S. = 0.1 and (f) 0.2 with respect to radiation dose.