HILe BUDGET AND KEPORIING CODE . Marshall Islands Radiological Safety Progran | CONTRACTOR NAME Associated Universities, Inc. 29. f. Detail Attachments. \ HA-02-01-02 CODE BNi WP NUMBER DATE PREPARED 03/31/81 TASK NO. ; | | REV. NO, 0 cont. Technical Progress cont. Technical Progress in FY 1980 cont. a few cases. Burdens elevated above this level could be attributed to recent ingestion of Bikini Atoll food which had been transported to Kili Island. Human milk samples hed been obtained from four lactating adult former Bixini females whose Cs~-137 body burden had been defined by whole-body counting and radiochemical analysis of urine. Milk samples along with Bikini Island coconut tree sap and nuts were analyzed dy gamma spectroscopy and atomic absorption to de~ termine the presence of Cs-137 and X-40. Results were used to estimate the Cs-137 body burden for Marshallese iafants whose primary food supply was human milk and coconut tree products. Activity ingestion rates and future body burdens for Cs-137 were estimated for the population who may return to Enue Island, Bikini Atoll. This projection involved a determination of activity transfer factors calculated from Rongelap and Bikini whole-body counting data and from activity concentration analyses of coconut tree products. These factors were comparable for both atolls and dose-equivalent commitments were projected for adults. Retrospective and contemporary external exposure rate data, whole-body counting data, and rediochenical analvsis of urine and blood data were reviewed interval June 1954 to December 1980 for the Rongelapese and Utirikese. for the Dosimetric models which best described the uptake regime were constructed for the nuclides of interest. Daily activity ingestion rates, whole-body dose~equivalent rates and dose equivalent commitments to various organs were determined. Population dosinetry results and methods were written up and reported in a BNL publication. Individual dosimetric data records are maintained at the Laboratory. Expected Progress in FY 1981. Personnel monitoring and related demographic data will be obtained from residents of Rongelap, Utirik and Enewetak and other areas of interest to DOE. The data base on diet and living patterns will be updated for all relevant atoils and/or islands. Expected Progress in FY 1982, Evaluation of the decline of body burdens among former Bikini Island residents will continue for that portion of the vonulation in residence on Majuro Atoll or Kili Island. Personnel monitoring will continue at Enewetak Atoll. HA-ea— ¥/