RADIOACTIVITY ALONG THE 80TH MERIDIAN
NUCEAR TESTS WN THE ATMOSPHERE
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WASHINGTON
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GROSS BETA ACTIVITY, PC/SCM OF AIR
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Fig. 1—Fission-product radioactivity in the ground-level air at some
sites in the northern hemisphere.
hemispheres, shown in Fig. 3, are based on the naive assumption that
the concentration of radioactive material per unit volume found at
ground level at a given site is uniform up to the tropopause and is char-
acteristic of that latitude. It is recognized that there often exist higher
concentrations of activity in the upper troposphere and that, particularly
during periods of nuclear testing, there is no uniform distribution
within latitude bands. Notwithstanding these and other less obvious objections, this method of presentation does represent rather clearly the
behavior of fission debris in the atmosphere.
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