#15
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the Eniwetck proving ground May through July 1956. In 1957 it preceded
Operation PLUMBBOB in Weveda (Hay 28 te Oeteber 7). 1% would appear
then that aajor increments in Sr-90 fallout have occurred seasonally in
Wew York City, whether or not test activities were going om at the tine.
This would suggest that these late winter fallouts contained a consider
able ancunt of stratospheric debris. It is hoped that pot sampling at
various sites around the world will determine whether the increases cb-
served at New York and also at Pitteburyh are truly seasonal effects
characteristic of these latitudes, and if so, whether it is characteristle
Lor the South Temperate Zone and even the Tropic Zone as well.
Pot
samples were being taken at the following stations as of October, 1957.
UNITED STATES
Birmingham, Alabama
West Los Angeles, California
Coral Gables, Florida
Leaont, TLlinois
New York, New York
Vermillion, South Dakota
Salt Lake City, Utah
OUTSIDE THE UNITED STATES
Viera, Austria
Rio de Janeiro, Brasil
Santiago, Chile
Se PE