~ 54 top 6 inches of soil on the island proper. A similar comparison for Ronge- lap Island gives values for lagoon sand of 2/11 to 2/5 that of the land soil. At Enibuk the soil and lagoon sand were essentially equal inlevels of radioactivity. In sand profiles taken at Kabelle and Rongelap Islands the radioactivity levels of samples taken in water depths of less than 25 feet were approximately 1 1/2 times those found in samples from 50 to 60 feet of water. Bot- tom samples obtainei from the anchor chain in 150 feet of water off Rongelap Island and Mogiri Island (Ailinginae Atoll) contained from 0.7 to 1.2 times as much radioactive contamination as was found on the islands proper. Comparisons of the distribution of radioactivity in the top 6 inches of soil and lagoon sand were made and are as follows. Percent of radioactivity in top 3 inches Island Kabelle soil Lagoon bottom off Kabelle Labaredj soil Rongelap soil Lagoon bottom off Rongelap Lagoon bottom off Enibuk Percent of radioactivity in 3 to 6 inches depth 97 3 57 97 89 43 3 11 55 45 42 58 Thus on land moat of the activity is concentrated in the top 3 inches whereas under water it is distributed throughout the top 6 inches (Fig. 14 A). Sand profiles from the lagoon off Kabelle Island under 6 and 60 feet of water, from off Rongelap Island under 22 feet of water, and from the Enibuk low tide line were fractionated according to particle size as follows: greater