90 portion of portion, the curve any more, but pretty much on the flat So the dose rate was not changing as rapidly as you might suspect. DR. DUNHAM: You would guess they got about one fifth of their dose in the first 12 hours. DR. BOND: That DR. SONDHAUS: is right. This depends very strongly on whether you assume the fallout was along one or short one. Alderson Reporting Company Washington, D. C. If you assume that the fallout was quick, that the dose 10 built up to a high rate very quickly, 11 hour dose would certainly be appreciably more than if the 12 fallout was slow and only reached its peak after 12 hoyrs. then the first 12 In either case, I don't think even in the maximum 13 14 case you can allow for more than about 30 per cent of the 15 total dose in the first 12 hours for the 51 hour exposure. 16 However, 17 evacuation was at 28-1/2 hours, I think the first 12 hours 18 would probably give as much as half the total dose. 19 are guesses. 20 but they are still not a great deal more than tht. 21 in the case of the Rongerik exposure, where the They are more than a guess out of DR. DUNHAM: 22 Harry, on that point. 23 CDR. ETTER: ARC 24 These thin air, I stand completely corrected | How long was the fallout actually observed by the natives? 25 About 10 o'clock at night. ~~ CDR. CONARD: qf