succeeding days after each shot as required. was the same as that used at Eniwetok. The instrumentation for each Communications from helicoptor to ground were provided by EG&G but proved to be unsatisfactory. Eventually, the data were sent back via the flight-operations radio net when necessary. Evacuation of the atoll before each shot required that the pre-entry survey originate from afloat. Normally the helicopter selected for the mission 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 island of Enyu was declared clear by CTG 7.1, personnel] returned to the island and al] 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 monitors 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. All radiochemistry work was carried out in this trailer. 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 was re- quired; gross beta-gamma activity was determined. 3.2 Shots and Survey Results Very little interference with preparations for firing the various devices was caused by excessive contamination. In certain cases the spotting 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 result of the contamination. Table 3.1 lists shots, shot dates, and times for Bikini Atoll. TABLE 3.1—FIRING SCHEDULE, BIKINI ATOLL t =m mele Devi Date (M.I.) Local Time 21 May 56 0550:38 28 May 56 0556 12 June 56 0626 26 June 56 0606 11 July 56 0556 21 July 56 0546 - 30 =~