A, RECONSTRUCTION OF CHRONIC DOSES FOR RONGELAP AND UTIRIK RESIDENTS ~ 1954 TO 1980 Ke T. Lessard, N. A. Greenhouse, R. P. Miltenberger ABSTRACT From June 1946 to August 1958, the U.S. Department of Defense and Atomic Energy Commission conducted nuclear weapons tests in the Northern Marshall Islands. BRAVO, an aboveground test in the Castle series, resulted in radioactive fallout contaminating Rongelap and Uririk Atolls. On March 3, 1954, the inhabitants of these atolls were relocated until radiation exposure rates declined to acceptable levels. Environmental and personnel radiological monitoring programs were begun in the mid-1950's by Brookhaven National Laboratory to ensure that dose equivalents received or committed remained within U.S. Federal Radiation Council Guidelines for members of the general public. Body- burden and dose equivalent histories along with activity ingestion patterns postreturn are presented. Dosimetric methods, results, and internal dose equivalent distributions for subgroups of the population are also described.