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
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