ABSTRACT During the period of June 11 to 21, 1956, a survey party, operating from the USS Walton (DE 361), measured the radiation in plankton, water, and fish samples collected near Bikini and Eniwetok Atolls. Fifty-three stations between 10° 15' to 14° N and 159° to 166° BE were covered during the 3,300-mile cruise. A continuous record of the radiation in the surface water was obtained with a probe. Plankton samples from oblique tows to a depth of 200 meters and water samples from the surface and from depths of 25, 50, 75, and 100 meters indicated radioactiv- ity at each station. Highest radiation readings in plankton and water samples were from stations north of Bikini Atoll. Radiation decreased around the periphery of the survey area. DOE ARCHIVES iv

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