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