BRAVO to ubtuin the initial increasing exposure rate history evinced on figures 24 and 26. this method yielded a fallout deposition period of 5.5 hours on Rongelap anu 12 hours on Utirik. This time compares well with the original ob~ servations i.:ported by the Marshallese and by U.S. Navy personnel stationed in the area (S157). greater detail Figure ries. Initial dose equivalents on "acute doses" are developed in in another report. 25 demonstrates the external exposure following the 1958 testing se- Since return to Rongelap followed 3 years after the BRAVO contamination, this series contributed in large part to the external exposure post return. 24