Table 216. Enewetak soil data, southern islands (pCi/g in top 15 cm). 90... Group A (DAVID, ELMER, FRED) Mean Range 0.41 0,02-4.8 137A, 2395, Mean Range Mean 0.21 0.01-2.1 0.04 Group B (All others except LEROY)* Group C (LEROY) Range Miean Range 0.004-0.31 0.03 0.01-0.15 . , 0.52 0.03-3.9 0.14 0,004-1.8 0.07 0.004-1.1 0.06 0,007-63 11 1.6-34 3.2 , 0.5-10 0,02-2.0 . 0,58 0.04-5.0 0.63 4S AM, TOM, URIAH, VAN, ALVIN, BRUCE, CLYDE, REX, WALT, GLENN, HENRY, IRWIN, JAMES and KEITH. part of YVONNE which lies north of the tower (Sta. 80 a, 1310). This area includes In an effort to obtain a reasonable estimate of the three-dimensional distri- the highest external gamma levels found bution of radioactive material in this area, on the Atoll, with levels of 500-750 uR/hr 45 profile locations (shown in Fig. 152) found over a five-acre site just south of were sampled to 150-cm depths. Plutoni- the CACTUS crater, um data for the profiles along the center In addition, pieces of plutonium metal weighing as much as of the island, and across the island at the several milligrams are randomly position of the plutonium-bearing layer, scattered on or near the ground surface are shown in Figs. 153-156. over most of the area from CACTUS all of the profile samples lead to the crater to a line drawn across the island, following observations: about 60 m north of the tower. Construc- e Data from There were no large plutonium tion and earthmoving activities during the particles analyzed in any of these testing period, for which we have no samples since the maximum reliable record, served to redistribute the Specific activity found was ~800 radioactivity in such a way that it is pCi/g. essentially impossible to get an accurate, Except for the area in the general detailed, three-dimensional survey of vicinity of the exposed plutonium radioactive species present in this area layer, there were few profile now. sampling locations where plutonium tower, Four hundred meters north of the for about 100 m along the ocean- concentrations exceeded 100 pCi/g side embankment, for example, there is at any depth. Of the four that did, a visible layer of dark soil roughly 20 cm two had the high concentration in thick, 10 to 20 cm belowthe surface, the top 10 cm of soil. which contains high concentrations of sampling locations where plutonium plutonium (3200 pCi/g in one sample). concentrations greater than 100 Profile