title: Fission Product Radioactivity in the North Polar Stratosphere.
abstract: 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.
authors.forename: P F
authors.initials: PF
authors.lastname: Gustafson
authors.forename: R B
authors.initials: RB
authors.lastname: Keener
authors.forename: G A
authors.initials: GA
authors.lastname: McGinnis
authors.forename: R A
authors.initials: RA
authors.lastname: Soller