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The yield of secondary electrons from thin (1.71 mg/cm²) aluminum foils by high-energy primary electrons is reported. The value is 0.0397±{}0.0003 secondary electron per primary electron from both sides of the foil. The result is independent of the primary-electron energy in the range 111-235 Mev.
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Tautfest et al. (1954) studied this question.
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