cathe aoe 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° E 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, ity at each station. and 100 meters indicated radioactiv- Highest radiation readings in plankton and water samples were from stations north of Bikini Atoll. Radiation decreased around the periphery of the survey area. qt Cr O° ay iv