will remain captured and thus, of course, completely eliminate any
fallout.
.
Prior to each nuclear detonation a "warning circle™ is estab-
lished for aircraft, designed to provide control of aerial flights within
the area of predicted path of the atomic cloud.
A representative of the H
Civil Aeronautics Administration is assigned tothe test organization and
assists in establishing the controlled area.
This may typically extend
about 150 miles in radius and be in force for a period from about H
minus one-half hour to H plus 10 hours.
All aircraft are required to
check through the Civil Aeronautics Administration before flying in
this area.
After each nuclear burst, aircraft from the Test Organization
track the cloud until it is no longer readily detectable.
Behind this
come other aircraft to plot the fallout pattern on the ground.
This
survey is repeated on D plus one day.
The off~site monitoring program during Operation Plumbbob
(Spring 1957) illustrates the exteasive system organized not only to
take numerous radiological measurements but also to provide close liaison
with the citizens of nearby commmities.
The Atomic Mmergy Commission
and the U. S. Public Health Service jointly organized a program wnerein
the areas around the test site are mapped out into 17 zones.
A techni~
cally qualified man has been assigned to live in each zone.
His duties
consist not only of normal monitoring activities but also, prior to
and during the test series, of learning the communities and families
in his zone, getting to know the people and having them know him.
In addition to the 17 zone commanders, as they are called, there are
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