authorized in specific cases. When this authorization was made, however, individuals were not to exceed 0.1 rem per day during the remainder of the operation (7: 64). Film badges were issued to individuals who might be exposed to radiation while performing their duties. In addition, over 75 film badges for each test were distributed among the six participating ships, to be worn from the day of the test to 7 days thereafter. Among the men in the test area during all or part of the testing operations, 2,416 were badged one or more times (7: 2). - Fallout occurred on the inhabited islands of Enewetak, Parry, and Japtan and on the six task force ships after three of the four shots in the series. Fallout from Shot DOG was approximately twice as great on Parry and Japtan than it was on Enewetak, where the majority of the island-based participants were located. Shot EASY fallout was insignificant and affected all residence islands equally. Shot ITEM fallout, on the other hand, was approximately twice as great on Enewetak as it was on Japtan (7: 3). Overall, calculated fallout doses for personnel remaining on the residence islands until the end of May, when the rollup phase was virtually complete, were nearly equal on all three of the islands: Enewetak, 2.93 rem; Parry, 3.10 rem; and Japtan, 2.87 rem. The amount of fallout received by the six ships varied with their locations and decontamination procedures. Nearly all crewmembers on five of these ships were assigned a fallout dose immediately after GREENHOUSE, and these doses were recorded in Navy medical records. The assigned doses ranged from 0.334 rem on USS LST-859 to 1.1 rem on USS Cabildo (LSD-16) and USS Sproston (DDE-577). Boat pool doses ranged from 0.700 to 2.1 rem. The fallout exposure was lower aboard ship than on the islands due to water washdown, shielding, and decontamination of external surfaces (7: 3). 86