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 = f£Kj, where f = fission fraction. d. Thus, the value of K to be used in a fallout model such as WSEG-10 is K = fe 7.565 . 1.599 x 107° -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. REDUCTION OF LOCAL FALLOUT WITH SCALED HEIGHT OF BURST © © aH oO > © N So Percent Reduction (%K) 100 0 20 40 60 J 80100 120 740 Scaled Height Of Burst (2) 4 ; re b »* hos rp: po ‘vt . pet rf 4 ry ri TI-8