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James A. Van Allen journal, December 1954-October 1955
Page 14
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(and of heavier nuclei) and the dependance of intensity on altitude. (b) Van Allen [Sketch/picture G.M. counters OOO over NaI crystal rectangle] rudimentary telescope for exploring the feasibility of measuring alpha particle intensity with a simple apparatus -- main purpose to investigate the latitude [knee?] in the alpha particle spectrum with rockoons during summer expedition 1955. 2nd Flight (a) McDonald's apparatus, consisting of a Cerenkov detector, a NaI crystal scintillator and a tray of Geiger tubes (all in same telescope) for same purpose as Webber's experiment with additional feature of determining the beta of each
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(and of heavier nuclei) and the dependance of intensity on altitude. (b) Van Allen [Sketch/picture G.M. counters OOO over NaI crystal rectangle] rudimentary telescope for exploring the feasibility of measuring alpha particle intensity with a simple apparatus -- main purpose to investigate the latitude [knee?] in the alpha particle spectrum with rockoons during summer expedition 1955. 2nd Flight (a) McDonald's apparatus, consisting of a Cerenkov detector, a NaI crystal scintillator and a tray of Geiger tubes (all in same telescope) for same purpose as Webber's experiment with additional feature of determining the beta of each
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