For purposes of scaling the mass contour ratio with veapon yield and other parameters, the mass considered must be a “scalable” mass. This means, generally, that the mass of the fallcart needs to be related to the original material thrown up by the detonation. In seawater detonations, the scalable mass is the seawater thrown up; any loss of water from the fallout droplets during their trevel through the atmosphere has to be accounted for. The mass of coral fallout requires correction for loss of carbon dioxide. Other factors which are not scalable but which could influence the value of the mass contour ratio inchate: (1) dilution of seawater- and harbor-burst fallout with rain fromatmospheric sources and with seawater from a base surge in underwater detonations, and (2) the dilution of land fallout by extraneous dusts fro winds and the blast’ wave from the explosion itself. Thus, either in deriving empirical scaling relations from available data, or in confirming theoretical scaling relations with data, the measured mass must be corrected to a "scalable" mass. ‘he unscalable quantities can then be treated separately on a case basis depending on the probebility of cecurrence and effect on the value of the decontamination ratio itself. Since a single decontamination operation will cover only a rather small amount of area and many individualseparate operations would be required to deconteminate ea large area in a reasonable time, the scaling functions for the contour retios should be point furctions. That is, the function should describe the contaminated system at individual points in the fallout area. Although most of the useful available date is in the form of point data, the point coverage has been small. In such a case, the function cannot be related to a point or region in the fallout area and degenerates to a “grand* average function for the entire area. The treatment of the data throughout the following sections will tend to show the degree to which the various parameters are point functions or an averaged function for the whole fallout area. por/Nw