S. E. Chappell, J. H. Sparrow, The Average Energy Required to Produce an Ion Pair in Argon, Nitrogen, and Air for 1- to 5-MeV Alpha Particles, Radiation Research, Vol. 32, No. 3 (Nov., 1967), pp. 383-403
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Chappell et al. (1967) studied this question.
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