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James A. Van Allen lab journal, March 1958-September 1959
Page 114
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scintillator: Thickness 0.070 to 0.050 inch. diameter: 0.070 to 0.050 inch. The scintillators which had already been cemented on the 6199's for payloads I and IV were machined down in our shop in situ without disturbing anything else. The basis idea of this change was to reduce the detection efficiency for fast electrons (and fast protons) passing through the disc-shaped scintillator from the side: (Explorer IV) [sketch/picture] Drawing includes: Arrow pointing to small rectangle with diameter 0.3 inch size on end of big rectangle] --i.e. through the side walls etc...But to retain ample sensitivity to
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scintillator: Thickness 0.070 to 0.050 inch. diameter: 0.070 to 0.050 inch. The scintillators which had already been cemented on the 6199's for payloads I and IV were machined down in our shop in situ without disturbing anything else. The basis idea of this change was to reduce the detection efficiency for fast electrons (and fast protons) passing through the disc-shaped scintillator from the side: (Explorer IV) [sketch/picture] Drawing includes: Arrow pointing to small rectangle with diameter 0.3 inch size on end of big rectangle] --i.e. through the side walls etc...But to retain ample sensitivity to
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