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5, ACTIVITY, PC/SCM OF AIR
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LOCKHART, PATTERSON, SAUNDERS, AND BLACK
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1957
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MIRAFLORES
1958
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| WASHINGTON
1959
1960
1961
1962
Fig. 5—Concentrations of *Sr in the air at selected sites in the northern hemisphere.
tivity maximum varies with the latitude, arriving earlier in the more
southerly regions.
In the southern hemisphere a similar but less well-defined pattern
of behavior appeared to exist; the spring maximum was most obvious
at the Antofagasta site and occurred during November and December,
at the time of the fall minimum in the northern hemisphere. This out-
of-phase relation is to be expected if a purely meteorological process
is the controlling factor. Guayaquil, located essentially on the equator,
exhibits the seasonal trends characteristic of the northern hemisphere
because of the far greater concentrations of radioactivity in air masses
from that source.