SLIDE 34 Integrated expousre and whole body absorbed dose. The total integrated exposure from the onset of fallout to evacuation was 7.2 x 10 “C kg (280 R) one meter above the surface of Rongelap Island. This estimate accounted for the build-up of fallout on the ground which was previously described by us and photons from 142 nuclides. A plot of the integrated exposure versus time is given here. The total infegrated exposure at one meter above the surface of Sif Island was 4.4 x 10 C kg (170 R) and at Utirik Island 4.1 x 10 C kg (16 R). These exposures were for the period of time from the onset of fallout up to evacuation, March 1 to 3, 1954. These air exposure estimates lead us to agree with whole body and external thyroid absorbed dose estimates made by Cronkite et.al. (Cr56). After the mitiplicative factor was applied to correct for living pattern, etc. we obtained a whole body dose estimate of 1.9 gray (190 rad) at Rongelap. This compared to 1.75 gray (175 rad) estimated by Cronkite. INTEGRATED EXPOSURE I | i} | ' i *350b- yg 4 aH 300}ie 40.0774 5 RONGELAP 8 < 250+ v 108 nn wy 3 = ny ~ oq a i 200}- 0.0516 ¥ 6 wl & 150b ° % 3 x a ° =~ i 100- 0.0258 & 50+ J 10 UTIRIK wid | 20 30 40 50 HOURS POST DETONATION 36 J 60 70