Fission Product Radioactivity in the North Polar Stratosphere

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Science  19 Oct 1962:
Vol. 138, Issue 3538, pp. 433-434
DOI: 10.1126/science.138.3538.433


Balloon-borne gamma-ray detection equipment flown from Thule, Greenland, during April 1962, indicated that there was considerable radioactivity above 70,000 feet. Gamma-ray spectra obtained indicated the source of much of the activity to be the Soviet nuclear tests in late 1961.