toa and 24d ay were expected pCi/eg and 0.06 pCi/g. to As expected, contribute at most a few percent the profile samples showed a wide to the total exposure rates. range of activity distributions as This was confirmed by Ge(Li) gamma a function of depth on the two spectral analyses of several islands. hundred soil samples collected on are difficult to make, both islands during the June 1975 on Bikini Island usually decreased survey. with depth in the first few centi- The detailed results of Fven though generalizations the activities the soil survey will be published meters with a relaxation length of in a subsequent report. about 5 cm (the depth at which the In summary, the soil survey included the random activity is et, or 37% of the surface collection of two types of soil activity). samples on each island: activities were relatively low and and profile. surface Each surface sample On Eneu Island, the uniform throughout the full range consisted of two L5-cm-deep cores. of depths sampled. Profile samples were obtained from data in conjunction with the data of the sidewall of a trench dug for Beck et al.," we estimated the 60 37 the purpose. median On Bikini Island the average "Cs and 606, activities to the Cs and Using these Co contributions total gamma-ray exposure rates exhibited by the 15-cm-deep core over the two islands to be 94% and samples were 41 pCi/g and 0.74 pCi/g, 6Z, respectively; while on Eneu Island, were assumed to be valid over the corresponding values were 2.5 remaining islands of the atoll. respectively. These percentages the External D ose Estimation In addition to the gamma-ray exposure rates, we need reasonable selection of possible to consider conditions that would cover the range the expected living patterns of the of doses that could be received by future inhabitants in order to any Sizeable segment of the popula- evaluate the external dose problem. tion. Of course, experiences during the Enewetak many uncertainties are These were based upon our 1 , ; inherent in the prediction of sutvey future Living patterns. with personnel from the Trust the following cases, Table 1, However, shown in . as well as on discussions Territory of the Pacific Islands. Suggestions have also been solicited have been chosen as a ~14-