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.