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The absorption coefficient of monochromatic 5.8-Mev radiation in aluminum is found to be 0.075±{}0.009 cm^-1. By deducting the theoretical value of the pair absorption coefficient, the Klein-Nishina absorption coefficient is found, which is 0.062±{}0.009 cm^-1. This value is in good agreement with the theoretical value. The experimental method used is such that all quanta which are scattered more than 10 degrees in the aluminum are excluded completely from the data.
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Halpern et al. (1939) studied this question.
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