islands have lesser concentrations of 137Cs in the soil. The average !37cs concentration varies over a considerable range among the islands. The 137¢5 concentration in soil and vegetation on Eneu Island, the other major residence island, is about 10 to 13% that of Bikini Island. islands large enough to be potential residence Nam, one of two other islands, has a 137¢5 concentration in soil about 70% that of Bikini Island; the !37Cs concentration in soil at Enidrik, the other large island, is about 15% that of Bikini Island. The transuranic radionuclide concentrations, and their ratios to !37Cs and 90sr, vary around the atoll reflecting the difference in the design of the devices employed for shots near the various islands. islands large enough to support residence, For the other two the transuranic radionuclide concentrations in the soil on Nam exceed those on Bikini Island, while those on Enidrik are somewhat less than those on Bikini Island. The radionuclide concentration decreases exponentially with depth in the soil column, with concentrations significantly higher in the surface than at depth. There are, of course, exceptions in various regions of some of the islands. The rate of change with depth does vary depending on past events. For example, on Eneu Island the distribution of 20Sr, 239+240py, and 24lAm is constant to a depth of 40 cm reflecting some past history where the top portion of the soil column apparently was mixed. fhe island was used as the major residence island for a few thousand personnel during the. test program and also for personnel during the 1968 to 1971 cleanup project. Furthermore, only a few soil profiles were collected on most islands and, for the most part, the profiles are insufficient in number and not adequately distributed to determine islands where contamination, the actual surface radionuclide distribution with depth. soils the general have been relatively undisturbed distribution pattern for al] exponential with depth in the soil However, on after radionuclides is column, with concentrations being much higher in the surface horizons (Robison et al., 1982a). MEGETATION There is a direct correlation at the Atoll between the concentration of a radionuclide in the soil plants. r . wi be 2 4 3 to radionuclide in Thus, although radionuclide data are not available from other islands because edible food crops Rm feo. and the concentration of that were unavailable 65 on most islands and scrub