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. If only a part of the total yield comes from fission, then a factor to account for the fission fraction is needed; in which case the equation for K would become K = fKj, where £ = fission fraction. d. Thus, the value of K to be used in a fallout model such as WSEG~10 is K = fe 77365 - 1.599 x 1072 -2 4 with the symbols defined as above. e. A curve of percentage of local fallout for various values of } compared to the fallout from a true ground burst is shown below. c oO a © © No aS oO Percent Reduction (%K) —_ Oo © REDUCTION OF LOCAL FALLOUT WITH SCALED HEIGHT OF BURST °°. peneneserecnhovanesumcesnahe 1 — ‘ i J 20 40 60 80 100 120 140 Scaled Height Of Burst (2) II-8