- §2 - oe top 6 inches of soil on the island proper. A similar comparisonfor 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 obtained from the anchor chain in 150 feet of water off Rongelap ee 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 madeand are as follows. Percent of radioactivity in top 3 inches Island Kabelle soil Lagoon hottom off 97 3 Rongelap soil Lagoonbottom off 57 97 89 43 3 Kabelle Labaredj soil _ Percent of radioactivity in 3 to 6 inches depth Rongelap Lagoon bottom off Enibuk 55 42 St ee 11 45 58 Thus on land most 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 awe UNIVEs wees UNr, wa ae