pn ee ° : APO 187 (HOw), c/o Postmaster San Francisco, Celiforaia Peper HEADQUARTERS JOINT TASS FORCE SEVEN >. aeeee 22 April 1954 » eo MEMORANDUM FOR RECORD SUBJECT<”BRAVO Shot, Operation ——_ 2. - PURPCS=: To make a Date 7 recora operationss aspects that were considered prior to BRAVO event of Operation CASTLE and to analyze the resultant situation in light of available pre-shot and post-shot inforzetion. 2GENERALINPORMATION Operation CASTLE is pleaned to consist of a series of seven eedetonations as the Pacific Froviag Grounds, which encompasses Eniwetok and Bikini Atolls. f SRAvo is the code neme that was given the firing of the first device, SHREP, &t 0645 M on 1 March 1954, off Namu Island, Bikini Atoll. . Subsequent to BRAVO detonation radioactive debris fell on certain inhabited etolls of the northern harshall Islands. Radiation intensities rose to levels sufficient to warrant evae cuetion of four atolls and ell personned were removed from these -atolls to Ewajalein in accordance with the operational energency plan of JIF SSVEN. Areas evacuated and ganra dosages received are indicated below: ATOLL POPULATION DISTANCEFRODOSES RECETYED Ailinginse 27 Rongelep .- Rongerik Utirik 79 Nil 80 RB (computed) 82 100 NK 100-130 R (computed) 23 ff 153 MM «15 ©. 270 MM 40 - 9B R (Lim badge) 17 R (computed) (#7) 28 american Service’"personnel; 25 USAF Weather Detachment plus 3 USA Sisnal Corps personnel. All evacuees are under competent medical care. S.° PREVICUS EXPERIENCE AND CHARSCTERISTICS OF NUCLIE DETONATIONS: scedioactive debris is an innerent charecteristic of all nucleer detonations. It originates from fission fragzests ani fizedleg E ation (Cyncoles),(ereentt Tade 3 a Ch LSIPLLAL tote J | Teed. Gas: Loemheerterrr ewe TIMATARQITIED . 1“ = € Oe