EXPOSURE ATOLLS TO le, Lessard, TT. FALLOUT: IR. THE P. lr. A. Conard and 2T. McCraw RADIATION DOSE Miltenberger, EXPERIENCE ‘'S. H. AT Cohn, RONGELAP 35. V. AND UTIRIK Musolino, | lBrookhaven National Laboratory, Upton, New York 11973, U.S.A. and 2Departnent of Energy, Office of Operational Safety, Washington, DC 20545, U.S.A. From June 1946 to August 1958, the U.S. Department of Defense and the Atonic Energy Commission conducted nuclear weapons tests in the Northern Marshall Islands. series, produced On March 1, 1954, a lJlarge amount shift. to subsequently In fell order on Rongelap and avoid BRAVO, an aboveground test in the Castle of radioactive debris, some of which Utirik Atolls external and due internal to dose an from wnexpected the wind deposited radioactivity, affected area, the inhabitants of these atolls were relocated out of the They returned to Utirik in June 1954 and to Rongelap in June were of 1957. Environmental and personnel radiological monitoring programs were initiated in the mid 1950's by Brookhaven National Laboratory. The objective was to maintain a comprehensive radiological safety progran. Post-return body-burden histories and activity-ingestion rate patterns were determined as estimates internal committed effective dose equivalent. External exposure rate and living pattern data were also collected. Relationships between body burden or urine activity concentration and a declining continuous intake scenario were developed in order to model retrospective and prospective dose equivalent (See Figure 1). The dosimetric conclusions for the protracted exposure are summarized in Table l. Figure 1: atoll. Body burden history for Rongelap adults post return to their hone