SLIDE 29 Airborne activity intakes were dependent upon Activity intake by inhalation. Breathing the breathing rate of individuals during fallout cloud passage. conclusion this at arrived We rate was assumed proportional to body mass. based on reference data given by ICRP for persons less than 58 kg (ICRP74). Adult reference values for breathing rates (ICRP74) were assumed for all At Rongelap Island, BRAVO debris Marshallese adults regardless of body mass. passed during the afternoon, a period of light physical activity for the population. At Utirik Island, the debris passed during the night, a period of resting. At Sifo Island a period of light physical activity was assumed in On the order to estimate breathing rate during the morning they were exposed. inhalation that qed basis of urine results and breathing rate, it was determi Less than 1% of I. could not account for the estimated activity intake for the intake could be attributed to inhalation. In fact lethal external exposure rates would have to accompany significant radioiodine intakes if inhalation was assumed to be the dominant intake pathway leading to the urine activity excreted on day 17. ESTIMATE OF INHALED ACTIVITY* KBaq Body Weight Rongelap Adult Male Rongelap Child 70 80 890 §20 370 220 410 240 97 55 18 10 110 59 20 12 Utirik Adult Male Utirik Child 70 30 70 41 —_ _ 1200 700 410 230 78 44 410 230 59 35 Sifo Adult Male Sifo Child 70 30 81 48 85 48 a,: . ~ 85 48 . 4.4 2.5 0.85 0.48 wos Air concentrations normalized to exposure rate measurements and fallout composition. 31 5.5 3.2 1.1 0.59