Please, I need the solution to this homework problem. The question is Knoll. (Problem 12.6 taken from Radiation Detection and Measurement, 4th edition, Glenn F.) A step-by-step solution will be highly appreciated. Thanks.
12.6 A germanium detector has a photopeak efficiency of 40% relative to that of a standard 7.62 cm x 7.62 cm Nal(Tl) scintillator. Find the counting rate for the 1.333 MeV peak for a 60Co point source of 150 kBq activity at a distance of 40 cm. (Assuming the intrinsic peak efficiency of Nal(Tl) is 10%, no gamma attenuation in the air).