Figure 6.2 showsthe dose distribution of the cohort film badges on SHEA between 30 March and 2 May, the only badging period for this ship. The 21 wet, missing, or lost badges (reflecting assigned doses as previously discussed) are not included. The calculated film badge dose is higher than the average of the dosimetry data. Several of the cohorts with missing badges are composed of personnel whose rating groups would be expected to spend morethan the average time topside. This would result in a somewhat higher average from the dosimetry data. Figures 6.3 and 6.4 summarize the cohort dosimetry available for COCOPA and MENDER. These were the principal support ships for Project 1.4 (Underwater Pressure Measurements). However, as indicated in the figures, there are significant differences in the badging periods and the doses that represent differences in specific activities and exposures, as discussed in section 3. Dosimetry for four badging periods for COCOPAis depicted in figure 6.3. Again, there are badges deleted as atypical that reflect unique activities of individuals or the cohorts represented. Two badgesfor the period 1-7 May with readings from 1300 to 1500 mrem for cohorts of 2 and 3 personnel are deleted as atypical. A third badge with an obviously anomalous reading of 3150 mrem is also deleted. This badge was worn by the ship's hospitalman and the cohort of 12 includes stewards, ship's cooks and storekeepers. While it is conceivable that the hospitalman may have uniquely experienced this high exposure, it is clearly not representative of the cohort or the crew. A badge for a cohort of four with a reading of 1285 mrem is deleted from the final period for COCOPA (8-18 May). The rating of the badged individual, his badging history, and his other cohort assignments strongly indicate that he was oneofthe ship's divers and would therefore have been engaged in non-typical activities and exposures during this period. As figure 6.3 shows, there is generally good agreement between the film badge dose and the calculated mean dose in three periods, subject to the observation that, in the second (10 March-29 April) and third (1-7 May) badge periods, the badge readings are unusally widely distributed, thereby suggesting the lack of a typical activity. The dosimetry in the last period apparently reflects some undocumented exposure(s). The MENDER dosimetry for three badging periods is shown in figure 6.4. The first period (27 March-27 April) includes an outlier at 1150 mrem for a cohort whose rating implies 96