(4) Although the cloud tracking plan included 10,000-f0ct aerial sweeps upswing of populated areas cashot day and lowelevel precision aerial sweepe on shot day plus one, it was found desirable to make low-level passee over the northern MARSHALL Islands on shot day, For this purfose, WE=29 cloud trackers were divertdd to dverefly these islands at approximately 200 feet from about H plus 10 to H plus 12 hours fora gmeral estinste of the existing conditions, Since majof fall-out could cecur within 10 to 12 heures after shot tim, the data obtained by these Mlighte gave reasonable ati tine= ly assurance £q operational decisions relative to the existence cf 4 teal hasard at the atells involved. “= (5) Considerable progress was made by scientific projects.in defining the fall-out pattern cver-water by sampling the water itself sod by lowelevel aerial survey of the contamineted water using sensitive scin— tilistion-type gums rate meters. The use of rift of bucyfall-out collec tors to measure the overmall patter was generally unsuecessful, due to cperational difficulties ta locating the eollectcrs, and due to losses of collec tors arising from failure to locate and from shot delays. The new methods, using a few rafts-or bucye to tie in actual sumerieal values of intensity shows great. premise:in solving the mjor fall-out documentation problem for future operations ithe: FPG. ft. - Perecamel. (1) The-shot phase of an operation of the magnitudes of CASTLE requires at least two Radsafe trained officers, at the Task Porce level preferably three, and at least three clerical assistants. A fulltime assistant Radsafé Officer available during the 2,-hour period immediately preceding and immediately following each shot would have precluded the requirement for 98 |