' boats for additional hosing after the first hosings. was down to 0.002 R/hr by 22 March Average intensify (Reference 80). The location of the fleet 48 hours after BRAVO is shown in Figure [66. At 0830 on 3 March, Eneu. the Bairoko reentered Bikini Lagoon and anchored dff Helicopters operated throughout the day from the flight deck on postponed data-recovery and other missions. The helicopters landed ir canvas "bathtub" on the carrier's deck if they had been to an island tion where they could have collected radioactivity on their wheels. bathtub prevented washwater containing the contaminants from flowing the flight deck (Reference 32). Some flight deck drains were still clogged and “hot" from the BRA washdown. Readings were about 0.100 R/hr, with one as high as 0.500 Crews unclogged drains throughout the day. Other spots, such as partsfof the antiaircraft guns, were decontaminated by hand scrubbing and rinsifg. Cocomat fenders and canvas were flushed to wash away contaminants, the located away from personnel to allow natural decay of residual radiocacfivity. Decontamination for the Bairoko was considered complete by the ead of 4 March (Reference 32). Contamination of Bikini lagoon water by radioactivity was considerédd a threat to fleet operations there after each shot. contaminants on the order of 1 microcurie per liter By 3 days after BRA (yCi/l) began to ag- pear; following a buildup, however, the level of contamination began tq fall after 10 days. Drinking water distilled from lagoon waters showeq significant radicactivity. Some radioactivity built up outside ship sqit- water pumps, drains, and other installations. The highest noted readily of this kind was 0.030 R/hr on the outside of a condenser on the USS Curtiss no (Reference 80). EVACUATIONS The TG 7.4 radsafe officer sent by the Commander, Test Services Uni AREP, along with two other WREP personnel, to determine the radiologic 224