The third badged period terminated the day of Shot NECTAR for the crews of the ESTES and PHILIP, and two days later (16 May) for the crew of the SIOUX. For the crew of the ESTES, dose calculations significantly underestimate the crews' exposure as inferred from the dosimetry data. As for fallout, only residual radiation from Shots BRAVO and ROMEO are considered as contributing to crew exposure; because the ESTES reentered Bikini Lagoon only briefly after Shots UNION and YANKEE, ship contamination did not contribute significantly to the calculated dose. The reasons for the poor agreement between the calculated doses and dosimetry data for the ESTES during this period are not clear, but it should be noted that exposures during this badged period are relatively low and account for only 7 percent of the crews' average operational exposure. For the entire operation, calculated doses are only slightly lower than the mean of the dosimetry data. Dose calculations for the crew of the PHILIP during the third badged period are significantly higher than inferred from the dosimetry data. Because the PHILIP remained in Bikini Lagoon during most of the badged period (see Section 2.2.16), most of the calculated dose (92 percent) is due to ship contamination, while residual radiation from shots BRAVO and ROMEOis only a minor contributor. Uncertaintiesin the ship contamination model alone do not account for the overestimation of crew exposure; it is more likely that the contaminated lagoon water from Shot YANKEE took longer to reach the anchorage areas in the southern part of the lagoon than the few hours assumed in the analysis. Again it should be noted that exposures during this badged period are relatively low and account for only 5 percent of the operational dose for the crew of the PHILIP as inferred from the dosimetry data. For the entire operation, calculated doses are slightly higher than the mean of the dosimetry data. . The correlation between calculated doses and dosimetry data for the crew of the SIOUX during the third badged period is excellent. Although Shot NECTAR fallout, along with residual radiation from Shots BRAVO and ROMEO, contributed somewhat to the calculated doses, approximately 80 percent of the calculated dose is due to the ship steaming in contaminated water for five days following Shot YANKEE (see Section 2.2.18). The ship contamination model! described in Reference 6 was applied for the full period to calculate the crew's exposure. 161 Results compared favorably with