Previous experimental results of the present authors on the energy loss of 18-Mev protons in aluminum are corrected to give a value for the mean excitation potential $I=168$ ev. It is pointed out that recent work on the range-energy relationship for protons in aluminum may indicate a variation of I with proton energy which is considerably larger than that to be attributed to the nonparticipation of the K electrons.
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Sachs et al. (1953) studied this question.
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