Shot6: (At Eniwetok) Over 1000 r/hr in tue immediate vicin~ ity of ground zero, dropping to 17 to 32 r/hr on the islands westward and 1 to 6 r/hr eastward from ground zero. Within the atoll, there was no apparent trend of radioactive carticle size distributicn with distance, direction,or time. approximate 5 to 20 ue 10 pp. Shot fron Shot 3 The number-median diameters of samples collected ranged fron Up to forty-three per cent of these particles were under 1 particles appeared to be coral or crystalline; those appeared to be mostly crystalline, ashlike, or fused. In particles from 149 to 1000 pn, the percentages of particles with activity on the cutside generally increased directly with size, while the percentage of uniformly radioactive particles generally Gecreased with size. These two types of particles accounted for about 9O per cent of the radioactive particles examined. Activity was scattered randomly throughout the remaining 10 per cent of particles. Ther: was no apparent correlation between the lccation of activity on the particles and their physical appearance. No conclusions could be drawn about the presence or absence of redioactivity in the base surge,because no samples were obtained in the base~surge region.