efforts on 3-4 March were directed at cleaning up "hot spots"; hence, the decreasein average topside intensities is due mainly to natural radioactive decay. At the time of Shot ROMEO on 27 March, the BAIROKO was steaming in company with the EPPERSON southeast of Bikini Atoll. it returned to Bikini and At approximately 1400 hours, anchored in the lagoon where it remained until 5 April. At 2000 hours on 28 March, the BAIROKO began receiving secondary fallout from the ROMEOcloud (Reference 10). Average intensities on the flight deck peaked at 25 mR/hr during the early morning hours of 29 March, and the ship's washdown system was turned on intermittently between 0130 and 0400 hours. There is no mention in the BAIROKO's deck log that further efforts were made to decontaminate the ship on 29 March. On 30 March, intensities were down to approximately 10 mR/hour. Figure 2- 12 shows the buildup and decay of the Shot ROMEO fallout on the flight deck of the BAIROKO. Also shown is the Shot BRAVO background radiation on the ship and its contribution ta the total recorded intensity. The BAIROKO did not receive any more fallout following the four remaining shots in the test series. In ‘addition to exposure from fallout, the BAIROKO!s saltwater piping system became contaminated while at anchor in Bikini Lagoon. By 4 March, "the average intensity in berthing spaces below the hanger deck was less than 2 milliroentgens per hour (gamma only)" and on 8 March, "the saltwater piping systems did not exceed 2 milliroentgens per hour (gamma only)" (Reference 17). This reference also states that “all fresh water samples from the evaporators tested by Task Group 7.1 have shown 1/5000 micro curies per milliliter or less." The ship contamination model developed in Section 2 is used to determine the crew's exposure due to ship contamination. Specific dates and times in and out of the lagoon, along with corresponding integrated intensities, are detailed below. Time at Bikini Lagoon Month March In 03/0834-12/1720 13/0720-26/2034 April 27/1400-05/1226 Integrated Intensity (mR) Out In 12/1720-13/0720 26/2034-27/1400 33 108.3 49.7 16.2 Out 1.9 0.8