succeeding days after each shot as required, The Instrumentation for each was the same as that used at Eniwetok. Communications from heliceptor to ground were provided by EG&G but proved to be unsatisfactory. Eventually, the data were sent back via the fiight-operations radio net when necessary. Evacuation of the atoll before each shct required that the pre-entr7 survey originate from afloat. Normally the helicopter selected for the mis- sion departed from the USS Badoeng Strait and made its first stop at the USS Curtiss to pick up the rad-safe personnel. The helicopter then stopped on Enyu to pick up CTG 7.1, and the mission was carried out. Once the {sland of Enyu was declared clear by CTG 7.1, personnel returned to the {sland and all operations were conducted from ashore. 3.1.4— Monitors for recovery parties were provided as required. As at Eniwetok, the demand was quite small. Generally speaking, projects provided their own monttors and required no monitoring assistance from TU-7. 3.1.5—The radiochemistry trailer, obtained from the Army Signal Corps, was deck-loaded on the USNS Ainsworth. ried out in this trailer. All radiochemistry work was car- The Laboratory Section handled approximately 400 water samples, which were taken from the water supplies of the various ships and from the swimming beach on Enyu. No chemical analysis wus required; gross beta-gamma activity was determined. 3.2 Shots and Survey Results Very l'ttle interference with preparations for firing the various devices was caused by excessive contamination. In certain cases the spctting of the shot barge was delayed for a day or so as radiation levels were excessive in those areas in which the surveyors had to work. Generally speaking, however, no delay was encountered as a reeult of the contamination. Table 3.1 - lista shots, sbot dates, and times for Bikini Atoll. TABLE 3.1—FIRING SCHEDULE, BIKINI ATOLL Device Date (M.1I.) Local Time Cherokee 21 May 66 0550:38 Zuni 28 May 56 0556 Flathead 12 June 56 0626 Dakota 26 June 56 0606 Navajo 11 TEWA July 66 0 21 July 56 0546 July wy 556 - 30 - ea ve woe my 8 pad we : : seat eee. so ‘y ‘ ‘ naa .