Procedure
2. Adjust the coarse and fine gain controls of the 575A Amplifier so that the 0.662 MeV photopeak for 137Cs falls at approximately channel 280. For the illustrations shown in Figs. 3.2 and 3.3, the gain of the system has been set so that 1 MeV falls at about channel 420 to 425. Since the system is linear, 2 MeV would therefore fall at approximately channel 840 to 850.