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James A. Van Allen journal, December 1954-October 1955

Page 89

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Pickering: phone: Sylvan 0-1141. ---------------------------------------------- He estimates 275,000 feet (10 lb payload 65,000 feet launch, I think).  ̄ ̄ ̄ ̄ ̄ ̄ ̄ ̄ ̄ ̄ ̄ ̄ ̄ ̄ ̄ ̄ ̄ "Beta- and Gamma-Ray Spectroscopy" Kai Siegbahn, Editor Interscience Publishers, Inc - New York (1955) Very good first chapter on absorption of beta-rays, etc.
 
Van Allen Papers