e i ocean beach to lagoon beach, a mean exposure of100 yR/h is probably on the conservativeside. | Table III also gives the estimated fractions of the exposure due to Cs-137 and Co-60 at the present time based on Gudiksen's soil sample data.and HASL celculated dose rate ratios. are alsoeevet conservative (too much Cs-137). These ratios The estimated depth distribution (relaxation length is the depth the activity is ent times the surface activity) is: also based on the soil data. These quantities are also highly variable and in all cases I tried to pick ceetees conservative values. Contributions to external dose from isotopes other than Cs and Co are negligible and have been neglected. 4 4, Table IV gives the calculated values of integrated dose for 5, 10, 30 and 70 year periods. These are the doses the population dis- tribution given in Table I would receive assuming an immediate return to the Atoll. The doses have been weighted by the population distribution to account for the fact that different population groups receive slightly different doses.. In actuality, however, it was found that the differences in exposure to the various population groups for the models choseh are minor (see Table V) considering the uncertainties involved. Also we note that the dependence on the time breakdown is also minor since the doses for; cases Ia and Ib are not very different. Case II indicates that having tne’ vittege area on a "clean" island lowers the short term doses by, only about 50%, indicating the large influence of the 25-304 of the time spent on the "hotter" outer islands.