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the Mike curve is derived from data at H+4 hours similar to the
present data and extrapolated to earlier times byusing the slope
observed in Nevada, it is obvious that the present data can be
better represented by a curve of greater slope.
From the greater
rate of decrease of intensity in the present operation it can be
concluded that both velocity and angular wind shear effects exce-4
those on Mike Shot and.that the persistent isokinetic layers
observed in Nevada are not being found.
Operationally, the effec s
of the sheared cloud structure derived from winds observed in the
shot area as close to shot time as possible.
From these projections,
altitudes and positions are chosen to give the best cloud
persistence for the later sampling aircraft.
The factor of four increase in sample obtained by the
'
E-29 was accomplished by approximately doubling the time eter
burst of cloud penetration and by almost doubling the radiation
exposure received by the crew.
Because of the dependence of “he
background contamination acquired by this aircraft relative to
in-cloud exposure upon the nature of the coral debris through
which it flies, it has been necessary to calculate the limiting
in-cloud exposure while in-flight from operational data reported
-
by the_B-29-after_onecloud-penetration.
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COPIED/DOE
a er
The expected decrease
mn ewe eee
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0 one enone
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of wind shear are anticipated by the use of plan-view projections