The first badged period covers Shot BRAVO fallout only, and agreement between the calculated mean and the mean of the dosimetry data is quite good for each ship. Calculated doses for the average crew for the ESTES, PHILIP, and SIOUX are lower than the mean film badge dose by 28, 19, and 19 percent, respectively. It is interesting to note that the calculated doses for the decontamination crews on the ESTES and PHILIP are quite close to the mean film badge dose, only 13 and 2 percent lower, respectively. The dose contribution from contaminated lagoon water during this period accounts for only 5-8 percent of the total calculated dose for the crew of each ship; hence, calculations based on radiological surveys obtained during and after cessation of the BRAVO fallout appear to adequately describe the crews' exposure. Fallout from Shot ROMEO was the second largest contributor to the total dose received by the crews of the ESTES, PHILIP, and SIOUX. The second badged period reflects exposures due to Shot ROMEO fallout as well as the residual from Shot BRAVO. Fallout from other shots that occurred during this period did not contribute to the dose on these three ships. The dose contribution due to ship contamination during the second badged period amounts to approximately 16 percent of the total dose received by the crews of each ship. The calculated mean for the ESTES is 24 percent lower than the mean of the dosimetry data; again the agreement is quite good. This is not the case, however, with the PHILIP and the SIOUX; calculated doses are almost twice the mean of the dosimetry data. Because ship contamination during this period accounts for only 16 percent of the calculated dose, the overestimation could be due to assumptions concerning crew activity scenarios during and after the fallout. ROMEO The crews on these two ships may have taken more protective measures during the ROMEO fallout than described in Section 3.1, where it is assumed that normal duty routines were not interrupted by the occurrence of ROMEOfallout. When the crews were mustered at approximately 0800 hours on 29 March, topside intensities on the ESTES were only 8 mR/hr and duty routines were probably not altered. PHILIP and SIOUX, however, intensities at that time were 19 and On the 30 mR/hr, respectively, and it is probable that normal crew routines were somewhat altered to reduce exposures. This change, however likely, is undocumented and thus cannot be used with certainty. 160