Cyrrn ee pens te ee en ~ - a ek succeeding days after each shot as required. The instrumentation for each was the same as that used at Eniwetok. 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 shat 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 Curt!ss 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, personne) returned to the island and all operations were conducted [from ashore, 3.1,4—Monitors for recovery parties were provided as required. Eniwetok, the demand was quite small. As at 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. ried out In thie 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 was 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 contaminatiou. In certain cases the spctting of the shot barge was delayed for a day or so as radiation levela were excessive in those areas in which the surveyors had to work, Generally speaking, how~ ever, no delay was encountered as a reault of the contamination. lists shots, shot dates, and times for Bikini Atoll. Table 3.1 TABLE 3.1—FIRING SCHEDULE, BIKINI ATOLL Device _ Date (M.1.) Local Time Cherokee 21 May 56 0550:38 Zuni 268 May 56 0556 Flathead 12 June 56 0626 Dakota 26 June 56 0606 Navajo 11 July 56 0556 TEWA 21 July 56 0546 - 30 - we - wee : ee ee ” " ty eee , ‘ et)