and K(x,W) = 4.00 x 10° 10 ,,-0 003Jail? 4 »W=12to >10° (35b) for detonations on land. The single value of K/q for each of the two water shots is the same indicating no variation in K(x,W) with yield for the water shots. Good agreement is shown with the two CASTLE shot values. of 0.797 for q gives : Substitution _K(x,W) = 0.34 x 1072° (36) for detonations on seawater. It may be noted that the general range in the 1 MI scaled distance from which these relationships were derived was from 10% £% (JANGLE "s" and PLUMBBOB Diablo) to 4 x 109 ft (REDWING Zuni and Flathead). The mass contour ratio scaling function, given by Eq. 24, becomes @ point scaling function when Eq. 35 is substituted for K(x,w). No direct comparison can be made with the idealized scaling of lq. 11 without integration of M.(1) over the whole fallout area. When Eq. 35 is substituted in Eq. 24, the latter is a grand average function. If it is assumed that the mass of seawater thrown up by e surface burst on seawater is the same as the mass of soil removed from the crater on a surface land burst then the ratio M(2) w(2) = 0.276 W0.038 poE/NW (37) suggests that from 50 to 70 % (W = 1 to 15,000 KT) of the water throm out is uniformly mixed with the radioactive elements. The calculated variation of the mass contour ratio values M*(1), for land surface detonations at given downwind distances (assumed. wind speed ~ 15 mph) and yields are shown graphically in Figs. 12 and 13. The values of the parameters used were: (1) W = 1 to 100 KT; a = 1.0, b= 1.0, q= 0.8, ip, = 0.19 67 ary