2.2.9 USNS FRED C. AINSWORTH (TAP-181) At the time of Shot BRAVO, the AINSWORTH was about 5-10 miles southeast of the CURTISS and did not encounter the early fallout as did the CURTISS, PHILIP, BAIROKO, and ESTES, all of which were north of the AINSWORTH's position. At 1300 hours, the ship began receiving fallout and, by 1700 hours, average topside intensities had reached 22 mR/hr (Reference 10). Although not explictly stated in the deck log, there is an indication that the ship utilized its washdown system shortly after the fallout started and also intermittently between 1600 hours, | March and 0800 hours, 2 March. Figure 2-19 depicts the average topside intensity following Shot BRAVO. The leveling off at 20 mR/hr for a 12-hour period is indicative of either using the washdown system while fallout is still being encountered or cloud "shine". The latter is unlikely since the AINSWORTH was in company with the CURTISS enroute to Enewetak during this time period and a similar phenonemon was not seen to occur on that ship (see Section 2.2.6). It is also noted from Figure 2-19 that decontamination with fire hoses may have been attempted between 1200 and 2000 hours on 2 March (H+29 to H+37), in order to reduce intensity levels to 10 mR/hr. Following Shot ROMEO on 27 March, the AINSWORTH, with many of the other TG 7.3 ships, reentered Bikini Lagoon at approximately 1300 hours. During the evening of 28 March and early morning of 29 March, the AINSWORTH encountered secondary fallout from the ROMEO cloud (Reference 10). Topside intensities peaked at 24 mR/hr at midnight but did not begin to decline significantly until approximately 0800 hours, 29 March (H+50). The deck log makes no mention of efforts to decontaminate the ship on 29 March. The AINSWORTH remained in the lagoon until 5 April when it got underway in preparation for Shot KOON on 7 April. depicts the average intensities resulting from Shot ROMEO fallout. Figure 2-20 No other shot in the test series resulted in fallout on the AINSWORTH. The AINSWORTH entered Bikini Lagoon ten times between 5 March and the end of May. Specific periods of time in and out of the lagoon, as well as the corresponding integrated intensities determined from the ship contamination model, are as follows: 76