Sop) teeptt ae Whole-body dose equivalent rate, mrem/y 60 (a) —l— —tt—- 50 —®— —o— . —k— —i— 40 —~— 0 20 40 Newborn 4-month old 9-month old 1.5-y old 4-yold 12-y old 18-y old 60 Whole-body dose equivalent rate, mrem/y 60 (b) ; 50F- ——™— Newborn —o— 1.5-y old —tt———e—- —*A— —iY— 40} —— 10 0 Years after ingestion 20 #£=4-mcnth old 9-month old »3=4-yold 12-y old —-18-y old 30 Figure 3. The annual dose equivalent from ingestion of 137Cs beginning at different ages; (a) shows lifetime dose equivalent rates and (b) shows an expanded view of(a) for the first 30 y of exposure. 9000142 : 1