Ar Ares of Toto! (Photo and Compton) A 0.03165 l i i 600 i l jf i¢ 1 poo ENERGY (KEV) Tow Fig. 3.26 Theoretical and Experimental Ratios of the Area of the Photopeak to Total Area and Fractional Absorption in a lein, NaI Crystal PP Tr@tt j l ito ‘ ; Tor brut i l jot tt titi q q l i CoPergde q bitiiit f— 3 FATT PHOTO PEAK CORRECTION FACTOR (GAMMA RAYS/VOLT COUNT/MIN) (00: (oo SOO 600 ENERGY (KEV) Fig. 3.27 Factor to Convert Area of Photopeak in Gamma Rays/Volt Count/min into Number of Gamma Rays/min 81