—y . + t id Methods and Measurements The sampling program will therefore consist of integrated sample series composed of food species and soil profile samples-which will be obtained on and adhoc, species available basis. A broader sampling fe ‘a, * ° program which will be based upon a wideley available species, probably Messerschmidia or Scaevola, will also be carried out to determine the intra-island variations in vegetation radioactivity. These data will be valuable in recommending future agricultural sites and to correlate with the broad soil radioactivity survey and the aerial survey. An attempt will be made to correlate some sampling sites with the ground water survey to provide data on the cycling or radionuclides at the given site. All food species presently growing and fruiting on Bikini will be sampled in triplicate if the quantity of materail permits. Soil profiles (2/tree) will be obtained in the root zone of the tree sampled to determine the concentration of radioactivity in the soil, the soil water, and the organic fraction. A large sample of soil (3 kg.) from the organic zone of the soil (1-30 cm. depth) will be taken to make a leaching measurement of soil solution radioactivity. Both leaves and fruit will be sampled to permit leaf-to-fruit transfer coefficients to be calculated. Nonfood species will also be sampled in the vicinity of the food species to provide information on species variation in radionuclide uptake, and to evaluate the use of nonfood species concentrations in pre- dictive assessment of human intake when no food products are available for analysis. This approach was used in the Enewetak survey because of the paucity of food species on the atoll. This program along with the ground water program will supply the data base for assessing the long-term dose commitment via food chains upon rehabitation of the atoll and inclusion of coconut, pandanus fruit, breadfruit, bananas, and papayas in the diet. Bikini Air Sampling Program Due to limited support facilities, manpower, and time, and due to other program demands for air sampling equipment as a result of the delays in fielding the present survey, there will be no attempt to establish and air sampling program during this survey.