82 EFFECTS OF IONIZING RADIATION iOr— 100 9}- 90 8L 80 7TH 70 6F 60 5+ 50 4l_ 40 ~ = 3 30 ° «= a = ws ef 20 N ~ E ~ 2 ~ > é it 10 q O9F 9 a 0.8;— 8 = O.7+ 7 = o 2.6;— ~ a t o5F <q ty mo 6 5 O4-- 4 0.3 3 O2- 2 n WwW oO O.1b s = <q oO 1 oO 20 30 40 S50 60 70 80 90 DAYS POST-DETONATION WO 110) 120 130 140 Fictre 5.1.—Beta and gamma activity in chicken excreta. normally constricted, possibly because of a decreased rate of endosteal resorption. A tibia from apig sacrificed 45 days post detonation had an area under the growing epiphysis S007) 29 ', free of activity (Fig. 5.4). As in the chick described above, this area corresponds to the growth which took place after the animal was removed from the area of contamination. The