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