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SESIDUAL RADIATION PATTERN FOR VARIOUS SURFACE
WIND VELOCITIES - UNDERWATER ATOMIC BURST:
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Staff Study by Maj. T. A. Gibson, Jr., USA, 14 March 1952
In the event of an underwater atomic explosion in a harbor, it
is. of interest to have estimates of the extent and magnitude of the
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is possible to make such estimates by using the information available
from the Bikini-Baker underwater explosion.
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residual radiation field as a function of surface wind velocity.
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Figure 8.101 of "The Effects of Atomic Weapons" (2) will be
assumed to be correct.
(Assumption No. 1) This gives the dose rate
at l hour after the explosion as observed on ships. Had the contamination fallen on land, the rates would be increased by about a
factor of four due to the absence of run off and the presence of a
greater contaminated area. That is, after a short time, a ship: is
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& limited contaminated area surrounded by an essentially uncontaminated
area. The final results of this paper should be multiplied by & to
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be made applicable to land adjacent to an underwater burst.
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Roger Revelle, in his "Characteristics of the Base Surge,” (2)
gives the observed movement of the Bikini-Baker surge. He also gives
predicted surge movement for other surface winds. These will be
essumed to be correct.
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{Assumption No. 2)
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The pattern of the Bikini residual contamination was observed
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comes from the base surge.
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deposition of contaminant can be expressed as:
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(Assumption No. 3)
a
= = Ke
Integrating and letting,
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where:
K is a constant to be determined
=
time of explosion
t,
=
time surge reaches an area
t,
=
time surge leaves an area
t
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The fourth and final assumption will be that the time rate of
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to lie in an area almost identical with the area covered by the base
surge. It. will be assumed that all of the residual contamination
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