MEASUREMENTS OF AIRBORNE RADIONUCLIDES
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RADIONUCLIDE
Fig. 9—Ratios of radionuclide concentrations in the stratosphere to
those near ground level in the northwestern United States in January
1964. Stratospheric samples taken at 65,000 ft at 37 to 43°N and 110°W;
trophospheric samples taken at 15 ft aboveground at 47°N and 11/W.