micrometeorological documentation is difficult but one which must be solved if any precise analysis of transport mechanism is to be made. Perhaps, radar tracking of a number of re- flectors dropped by parachute just prior to zero time could be used to define the microstructure of surface wind currents. Certain early collections of radioactive material deposited from the base surge Suggest that fractionation of fission products iS a time-dependent process. On any future underwater deto- nations, this hypothesis should be carefully investigated. By obtaining a series of discrete samples of base surge during the first 5 or 1U minutes after zero time and by measuringtheir decay immediately after collection, considerable insight into the problem of fractionation might be obtained. With this information, questions concerning amount and rate of deposition from the base surge could be more accurately answered. These same samples could also be employed to obtain more information on the size of the individual base surge droplet and its variation with time. This information aiso has a direct bearing on the amount and rate of deposition from the base surge. More information on the precise mechanism of radial expansion for white water is needed to analyze both the relative importance of this source of radiation and the true magnitude of forces that can be exerted by such an expansion. Photographic evidence suggests that the expansion of white water is due to the rapid overlayering of surface waters by aerated water upwelling around surface zero rather than a more massive toroidal circulation. Finally, the project recommends that a complete operational analysis for moving ships be made on the basis of the data contained in this report and the final reduced photographic information on surge movement. The procedures for the delivery of nuclear antisubmarine weapons (Reference 3) can then be modified on the basis of this operational analysis. 346