~84. | DRAFT A data base for assessment of terrestrial foodchain transfer of radioactivity from the soil to man for long-term dose evaluation upon rehabilitation of the atoll. Methods and Measurements The sampling program consisted of integrated sample series of food _ species and soil profile samples obtained on an adhoc, species available basis. sampled. All food species presently growing and fruiting on Bikini were A broader sampting program based upon widely available natural species, Messerschmidia and Scaevola, were also carried out to determine the intra-island variations in vegetation radioactivity. Soil profiles were obtained from the root zone of each sampled tree to determine the concentration of radioactivity in the root/soil environment. Both leaves and fruit were sampled so that leaf-to-fruit concentration ratios could be calculated. Nonfood species were 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 predictive assessment of human intake when no food products are available for analysis. This approach was developed in the Enewetak survey due to paucity of food species on the atoll. The soil samp Ting results and the concentration factors and correlation factors developed from the plant/soil data have been published as a separate report (5). This program along with the ground water program supplies the data base for assessing the long-term dose commitment via foodchains upon rehabitation of the atoll. —scsa3