dynamic falleout plot technique developed on CASTLE, This technique employed the concept of a 2Lehour period of falleout and considered the effscts of time and cloud displacenent factors on wind systerns within approximtoly 50C miles of the shot site, (2) .erdal cloud tracking flights were used 18 the prizery neans of obteining a rapid evaluationvof the relation between forccast and actual atomie cloud travel, dditional precision aerial surveys of land asses in the Marshall Islands wore supported for studies being conducted by the New York Operations Office, .£C (NYKOPO), These two types of flichts, together with a network of (NYXOPO) cround monitoring stations, were used to considerable cutual and timely advantage by the task force and the NYKOPO representa~ tives in evaluatins the fall-out patterns on populated islands ani, by the task force, in advising appropriate headquarters sharing responsibilities for these arcas, ° (3) The maintonance of personnel radiation exposures at the Lowest possible lowel was the third major task force iiadsafe problem, The plenned Maximum Permissible Exposure (MPE) of personnel was 3.9 reentzens. However, it was enticipated that this limit would be too low considering the number and expected yields of the weapons and devices to be tcsted. Consequently, the Rradsafe Plan, with the coneurroneo of the Surgeons General of the three Services and tho Director, Division cf Biology and ifedicine, aS, included provision for waiver of the MPE by the task force comusnder in individually designated cases when circumstances indicated the need and justification therefor, ‘This authority, exercised for a relatively few number of individuals, was adequate for the completion of essenticl C..STLE missions, Except for relatively high accidental exposures on 28 personnel at the_task force weather station on iiongerik .toll. and a small nuzber of