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UNCLASSIFIED
The fall-out from TUMBLER/SNAPPER (Restricted) and UPSHOT/ENCTHOLE
(Restricted) Test Operations is examined in some detail in this report.
The radioactive contamination resulting from the tower shots of the
above two test operations is plotted pictorially (see Figures 1 through
9).
Both the air and ground radiological zonitoring data contained in
the Radiological Safety Reports of the test operations have been
utilized (1,2).
IZ,
RADIOACTIVE FALL-COT DUE TO SAND AND SOIL DEBRIS FROM TOWsR SHOTS
OF TUMBLER/SNAPPER (R) AND UPSHOT/KNOTHOLS (R) TESST OPERATIONS
A.
Radioactive Fall-out as a Finctican of Yield and Height of
Detonation Above Ground
During high air drops of nominal bambs there is practically no
stem formed to the atomic cloud.
As the height of detonation is de-
may or may not reach the rapidly rising mishroom,
As the height of a
itt
intial
ereased, or the yield of the bomb is increased, a stem is formed which
bemb is reduced still further there appears a definite stem to the cloud
which is continusus with the mushroom.
Aswever, no extensive fall-out
_occurs within immediate area of the test site unless the height of
detonation is so low that the fireball touches the ground,
An inspec
tien of Table I brings out the fact that unless the zaximum fireball
KADIUS
diameter is greater than the height of burst there is practically no
radieactive fall-eut within 200 miles of ground zere (fall-out being
less than 1%).
During the two test operations this factor was verified
in a sufficient number of cases so that it is possible to put considerable
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