This predicts that the local fallout from a 1-MT fission yield detonation on a 400-foot building would be about one half (1017/1930) the level that would be produced by the same weapon if detonated as a true ground burst. .C.e If only a part of the total yield comes from fission, then a factor to accouat for the fission fraction is needed; in which case the equation for K would become K = f£Kj, where f = fission fraction. d. Thus, the value of K to be used in a fallout model such as WSEG-10 is -2 with the symbols defined as above. REDUCTION OF LOCAL FALLOUT WITH SCALED HEIGHT OF BURST Percent Reduction (%K) aS N mo c ° © © © 100 0 @6©.20 46+«€60°~«C80~«100.~-120 Scaled Height Of Burst (2) II-8 JZ e. A curve of percentage of local fallout for various values of \ compared to the fallout from a true ground burst is shown below.