V2 diluted in concentration by natural sediments, after settling out of suspension at distances downstream corresponding to longer suspension periods. Tompkins et al. (1970) suggests a generalized specific activity vs. particle size distribution for radioactive debris produced by the Bravo detonation. The specific activity is shown to increase very rapidly with decreasing size for particles smaller than 44u in diameterand to decrease with increasing size as 1/D or 1/D2 (for refractory and volatile radionuclides) on particles larger than 300y indiameter. The combination of the cloud and subsequent aqueous phase processes which act to fractionate the particle sizes would thus, a priori, also act to fractionate the radioactivity; these processes could be in evidence in the logarithmically decreasing concentration profile, which this work suggests was deposited over a short time period in the central depth region of the Station B-2 core, and in surface sediments away from the regions of highest activity. The sedimentation rate measured in the upper 11 cm of sediment collected at the station closest to the Bravo Crater (Station B-2) shows that this material was deposited at a constant rate between the 1950's and 1972. The 226p 4.2544 ratios in surface sediments (and with depth in the Station 8-20 sediment core) in the northwest quadrant show that although the initia? source for the fine sediments deposited at these locations was the detonation craters, the present location of the source supplying the material for redistribution is not known, The importance of this point should not be underestimated, for the location and extent of the source of these fine sediments may determine the continued availability of the radionuclides for redistribution. It is clear, from the large size of the Bravo, Tewa and Zuni craters, that a huge quantity of pulverized sediment has been removed from the craters. The great majority of this material was probably removed immediately following