Shot NECTAR was detonated on Enewetak. Figure 1-1 depicts the locations of Bikini and Enewetak with respect to the other atolls comprising the northern Marshall Islands. Figures 1-2 and 1-3 show the main features of respectively, and the locations of the CASTLE detonations. Bikini and Enewetak, The pertinent details of each test are summarized in Table |-1 (Reference 2), Table 1-1. Operation CASTLE shot data. Shot Name Local Date (time) Yield Location BRAVO 1 Mar 54 (0645) 15 Mt Bikini ROMEO 27 Mar 54 (0630) Li Mt Bikini KOON 7 Apr 54 (0620) 110 Kt Bikini 26 Apr 54 (0605) 6.9 Mt Bikini YANKEE 5 May 54 (0610) 13.5 Mt Bikini NECTAR 14 May 54 (0620) 1.69 Mt IVY MIKE Crater, UNION 1.2 _ Enewetak NAVAL PARTICIPATION The devices were tested by a joint military and civilian organization designated as Joint Task Force Seven (JTF-7). Although military in form, it was comprised of military, Civil service, and contractor personnel. JTF-7 was organized into five main task groups with Task Group 7.3 being the naval contingent. Most of the approxi- mately 6000 personnel assigned to TG 7.3 were aboard the various task group ships; however, approximately 650 were stationed on Enewetak and Kwajalein Atolls. Table l-2isa summary of the atolls and ships for which dose reconstructions are specifically addressed in this report. Also tabulated are the approximate number of personnel assigned to each. 1.3 METHODOLOGY The procedures developed in previous dose reconstruction efforts have been adapted to the shipboard radiological environments of Operation CASTLE (References