respectively) where removal of the samples to allow preliminary predic- top LO cm of soil would reduce soil tion of concentrations in nearly all concentrations by approximately five- components of the postulated Bikini fold. diet. This of course would result These predicted concentrations in reduced external exposure and are based on soil~plant concentration reduced uptake Factors and on fruit-leaf, in plants grown in such areas. or fruit-fruit concentration ratios Although considerable variation in soil leaf-leaf, radionuclide concentration is observed on both islands, calculated from the 1975 field data. The predicted concentrations compare Eavorably with the available measured the soil concentrations on Bikini Island are concentrations. approximately ten times those on Eneu survey of Bikini Atoll with larger Island. sample sizes is needed to statistically In addition, the relative A more extensive radionuclide soil concentrations are verify these preliminary results. very consistent; concentrations of 90 137 , Sr and Cs are ten to twenty times the meantime, ? greater than those of 239,240), L ; Am which, in turn, 0 times greater than Therefore, are two to Co potential In future concen- trations in foodstuffs from Bikini can nd be predicted from our concentration three factors if measured soil concentrations . concentrations. are available and from our conecentration ratios if only vegetation samples generalizations can safely be made from the soil data to the are available. etfect that inhabitants on Bikini commitment expected Island will be exposed to higher doses jected Lifestyles From our predicted than concentrations are reported in Part § those on Fneu tsland. both islands, Also, on 906. and ae are the of ) concentrations trations measured : from soil concen- in the the literature. this report series. 13? c Cs, followed by 239, 240), ; man from this pathway. er ; ; within a given species, taken from ‘this approach was magnitude greater than programs were limited in the early which, in turn, surveys. uptake by one to the terrestrial sampling program of the and will In general, / Cs uptake by fruit and leaves is one order of adopted because vegetation sampling However, Sx and f constitute the major internal dose to Field and from concentration factors from various pro- terrestrial foodchain are in terrestrial foodstuffs at Bikini Atoll have been predicted the dose The predominant nuclides in the vadionuclides of primary importance. In the past, Estimates of L975 Bikini niLlude. survey included sufficient vegetation Oc, up take 239,240 Pu exceeds two orders of mag- Uptake by mature leaves af papaya, banana, and breadfruit varies —35-