Another action that would achieve the maximum dose reduction that can be expected is through importation of clean soil from the southern islands or from outside the Atoll. 90, concentrations in the average profile (Table 6) do not get as low as those on the southern islands even at a depth of 180 cm. To achieve this maximum effect, however, sufficient clean soil has to be imported to encompass the entire root system of the mature trees and the water supply for these crops must not have 70sy levels higher than those found in the southern islands. granular. Any replacement soil should be soarse and Such soil is less likely to blow away or wash away. Given these conditions, the 57 Rem bone dose of case DI-1 may be reduced to 18.9 Rem (57-39.1 + 2.1 (0.45) (the 2.1 Rem from Table 241 and 0.45 from Table 243 of NVO-140). As to the question of whether equivalent dose reductions (equivalent to reductions obtained through modification of the diet) could be obtained through removal of contaminated soil, the Task Group holds the opinion that some reduction is possible. However, the magnitude of this reduction is uncertain and can only be determined reliably through measurement of the radionuclide content of the important food items such as pandanus and breadfruit grown in the modified condition. This would require a research effort to grow test plantings of the various food crops in the soil removal and replacement areas using various fertilizers and trace minerals, and analysis of radionuclide content of the fruit produced. There is the possibility that radioactivity in the fruit could be reliably predicted from analysis of stems and leaves of young and as yet unproductive plants. additional study. -12- This would require