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UNCLASSIFIED
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cad danieapaensietidelntant _
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aaaitaian sania
Coated with fission preducts.
—_—
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Lf it is presumed that the ratio of
at, deat teal |e
inactive soll debris to active sand in the fall-out area is 100 tol,
then 100,000 to 500,000 tons of sand and soil debris were sucked up by
each U/K tower shot,
If this view is correct then certainly the pre-
sence of 10 to 50 tons of tower material will not have a profound effect
on fall-eut from tower shots,
The surprising thing is that even when
such large quantities of soil is sucked up into the cloud in many
instances no crater is formed at greund zero.
This means that only a
few inches of soil is lifted up from the area of ground zero.
Actually
one inch of soil froman area of approximately two square miles would
account for the total mass of soil debris sucked up in the atomic cloud.
It may be possible to reduce the fall-out from low scaled height detonations by stabilizing the soil in the target area.
Hovwever, it may be
necessary to stabilize permanently one to five square miles of the targst
area in order to prevent a significant amount of soil from being mixed
up with the stem and mushroom of the atomic cloud.
It is recommended
that within a circular area of approximately one mile radius the target
area be firmly stabilized by cement or other means of permanent stabilizatien.
It is believed that if a 10 ET bomb is detonated from a 300 /%
tower over such a large stabilized area, the amount of soil sucked up
into the cloud would be reduced uaterially, thus reducing subsequent
fall-out significantly.
However, if it is impractical to permanently
stabilize such a large area, then it is suggested that even if a circular
area with a radius of 500 ft is permanently stabilized by cement or
other permanent methods, there may still be considerable reduction in
UNCLASSIFIED
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C3