ABSTRACT
A world-wide network of gummed film stations was established
to monitor fallout following Operation Castle.
Although meteorologi-
cal data were poor, 3 general commection of tropospheric flow
patterns with observed fallout.was evident, There was a tendency for
debris to remain in trovical latitudes, with incursions into the
temperate regions associated with meteorological disturbances of the
predominantly zonal flow. As the season advanced, such incursions
became more evident. Outside of the tropics, the southwestern United
States received the greatest total fallout, about five times that
received in Japan.
The total world-wide fallout up to July 1, 195k,
from thea Castle series
estimated to be about
qutside of the immediate test area, is
of the total fission activity produced.
The maximum fallout on any day at an individual station _in the
United States, corrected to sampling day, was 200,000 d/m/ft?,
It is concluded that the probability of early fallout in
inhabited regions would be reduced by holding Pacific test series
in the winter months.
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