LLL/EV-82-22 f. ~299- Technical Progress Fiscal Year 1979 A preliminary reassessment of the potential doses to a population living on Eneu and Bikini Islands was completed. It included evaluation of external gamma exposure using recent data obtained in the Multi-Atoll Survey, evaluation of the terrestrial food-chain using data recently developed from the Eneu test plots, evaluation of the inhalation doses, and reevaluation of the marine food-chain. Annual doses predicted for Eneu Island are less than the 500 mrem per year federal guidance; predicted doses for Bikini Island are twice that recommended in the guidelines when imported foods are available and four times that recommended when imported foods are unavailable. A complete reassessment of of the radiological situation of Enjebi Island at Enewetak Atoll was made and will form the basis for decisions concerning immediate and longer-range use of this major residence island. The assessment included evaluating doses from all exposure pathways for 90sr, 137¢cs, 239+240pu, and 24lam. Average bone marrow and whole body doses for Enjebi Island if imported foods are available are about half the federal guidance of 500 mrem per year; if imported foods are unavailable the predicted doses are right at federal guidance. patterns on other Predicted doses for living islands at Enewetak Atoll are less than those predicted for Enjebi Island. Fiscal year 1980 An assessment of the northern half of Enewetak Atoll will be completed. This will include evaluating alternate living patterns uSing the northern islands and evaluating use of coconuts planted on the northern islands. A dose assessment of the marine pathway will be completed for 13 atolls and islands visited during the survey. Also an evaluation of groundwater and drinking water will be completed on those atolls where samples were obtained. We will give top priority to processing and analyzing samples from Bikini and Rongelap Atolls. Data from both atolls will be available during this year to complete the radiological dose assessments, including all exposure pathways for all radionuclides. The Bikini assessment will also include alternate living patterns involving Eneu and Bikini Islands. We will continue to develop the Marshall Islands data bank and add new data from the ongoing environmental research projects. A part of this effort will include formatting the data base such that data from other DOE studies in the Marshall Islands may be included at some future time.