SECTION 5 FILM BADGE DOSIMETRY At Operation CASTLE, the issuance of film badges to personnel generally followed one of two basic procedures: (1) individual or "mission" badging, where personnel were issued badges when they were expected to enter areas of radioactive contamination other than those encountered onboard the ships; and (2) cohort badging, where a group of individuals performing duties in the same area of a ship would be assigned a dose based on the actual! reading of one film badge worn by an individual within the group. Generally, individual badges reflect higher than average doses, whereas cohort badges reflect the average exposure of a group of individuals during a certain time period. The total dose assigned to an individual was obtained by summing the recorded dose on a cohort badge with any individual (mission) badges assigned to that individual during the same period of time covered by the cohort badge. Sufficient dosimetry data are available for three ships for which dose calculations have been performed that allow meaningful comparisons. On these three ships, the ESTES, PHILIP, and SIOUX, cohort badges were issued for three time periods and provide a continuous record of exposure during the entire operation. Reconstructed doses are Compared with dosimetry data obtained during each specific time period and with the total operational exposure of individuals who were badged during all three periods. Not all personnel badged during a specific period wore badges for all three periods, thus the number of doses obtained covering the entire operation is less than the number of personne! badged in any one time period. Figures 5-1, 5-2, and 5-3 summarize the available dosimetry data from ESTES, PHILIP, and SIOUX, respectively, as obtained from cohort badges. the The dosimetry data for each ship are depicted by a series of four histograms; one for each of the three badged periods and a summary of the total dose received by those personnel who were badged for the entire operation, i.e., for all three periods. For comparison, the calculated mean is also depicted above each histogram. For the total Operation summaries, upper and lower bounds for the calculated means are also depicted. For the ESTES and PHILIP, calculated means for the average crew and for those involved with decontamination following Shot BRAVO are both presented. 156