SLIDE 29 Activity intake by inhalation. Airborne activity intakes were dependent upon the breathing rate of individuals during fallout cloud passage. Breathing We arrived at this conclusion 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 Marshallese adults regardless of body mass. At Rongelap Island, BRAVO debris passed during the afternoon, a period of light physical activity for the At Utirik Island, the debris passed during the night, a period of population. At Sifo Island a period of light physical activity was assumed in resting. On the order to estimate breathing rate during the morning they were exposed. basis of urine results and breathing rate, it was determi q¢d that inhalation 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* Body Weight KBq kg 1357 47 70 30 890 520 370 220 410 240 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 Rongelap Adult Male Rongelap Child a . : - a 85 48 . 1327 4.4 2.5 WSly 0.85 0.48 aos Air concentrations normalized to exposure rate measurements and fallout composition. 3] 2, 5.5 3.2 inn, Ll 0.59