Whole-body dose equivalent rate, mrem/y 60 —o— 50 —k—- 4yold 40 (b) 50- Newborn 4-month old —o— 1.5-y old —i— 12-y old —— 10 Years after Ingestion 12-y old —— —O——*— 0 1.5-y old 60 —e— 40+ 4-month old g-month old —A— 20 Newborn —__o— —_o-— 60 Whole-body dose equivalent rate, mrem/y —i— (a) 20 9-month old 4-y old 18yold 30 Figure 3. The annual dose equivalent from ingestion of 157Cs_ 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.