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Characteristic K-shell x rays produced when protons of 60- to 500-keV energy are stopped in thick targets of magnesium, aluminum, and copper have been studied using a proportional counter of conventional design. The thick target yields were measured. The x-ray production cross sections have been calculated for the K shells. Ionization cross sections have been estimated and were found to be smaller than the values predicted by the Born approximation in all cases.
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Khan et al. (1964) studied this question.
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