imported food. There are, of course, other options As was discussed in the chapter on dietary and living patterns, for reducing the dose via the terrestrial! imported foods are very likely to form a_ pathway. significant fraction of the diet (possibly One option would be to dig large area pits on all islands which would be 85% or more) and, if so, a plan to con- filled with "clean" soil from another trol the production of pandanus and source; pandanus, breadfruit, coconut breadfruit, or at least the location of and other plants could then be grown and harvested from these "clean" soil areas throughout the Atoll, The subsequent reduction in dose would lead to doses from 90... equivalent to or less than those predicted for the southern islands. production, could essentially reduce dose | commitments to levels near U.S. external background. BEST AVAILABLE COPY External Dose —~ The integral 30 yr Another option would include rernoving external dose is reduced between 30 and the surface layer of soil (0-20 cm) from 70% for living patterns Ill, IV; V, and the northern islands and replacing it with VI as aresult of plowing the village uncontaminated topsoil, island and graveling the village area This approach should also lead to doses equal to or where people will spend a majority of less than those predicted for the southern their time. islands. This form of remedial action These procedures are fairly , “straightforward, relatively easy to would in the process reduce the dose via implement, and lead to the largest per- the inhalation pathway, centage reduction in external dose. This alternative, An of course, requires the removal and additional reduction in external dose of disposition of an enormous amount of approximately 16% could be attained if soil, and ocean dumping, which would all islands were plowed; however, provide the large reservoir needed and implementing such 2. program in order minimizethe potential man-rem, to achieve the additional slight reduction would probably be the best and easiest method of disposal, This approach is certainly not one of the easier alternatives. Efforts to maintain a high calcium diet could also be implemented to reduce the uptake of 90¢,., however, remedial is certainly another order-of-magnitude problem. In any case, any plan to plow all islands would have to receive careful | scrutiny to determine the possible effects upon the island and Atoll ecology. measures to reduce the uptake in the plants or food product would be more effective and desirable as the primary preventive measure, . Of course, the dose commitment would be largely eliminated if no pandanus, breadfruit, or coconut were planted on the Atoll for another 20 to 30 yr andif the diet were to consist of predominantly Marine Food Chain — The mmaringfod chain would appear to require no remedial . sarc ————————— — action (see marine food chain chapter ). eg The marine pathway contribution to the 30-yr integral dose for the modified case and for agriculture on southern islands (Table 210) is less than 4% for whole