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Those are just tremendous orders
of magnitude between those two.
However, since the problem is with
us, we consider a fallout in a rather ideale
ized sort of model, an infinite plane, a smooth
Plane -~- no hille, a structure initially with zero
attenuation.
There are three principal come
ponente to the occupant of a structure.
There is the component from the
roof, there is the scattered contribution
from the ground end there is the direot
radiation from the ground in this fashion,
(indiceting mbleckboard.)
.
It is both theroretically and ex-
nerimentally fensible to determine the direct
radiation from the fallout.
It can be cale
culated quite precisely; that is the vrimary
radietion,
The scatter situation om the other
hend is altogether a different kind of problem,
To determine this by oalculation is a rather
formidable task,
There are unoertainties in
the orogss section; the mathematical techniques
become involved especially when you go out
over many sean free paths, co in order to get
some fundamental scattering data we went to the
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