An experimental range-energy relation in Ilford C-2 emulsion has been obtained for protons up to 39.5 Mev. In the region from 17 to 33 Mev the relation for dry emulsion is fitted by the empirical equation E(Mev)=0.251R_(μ)^_0.581. Variations in water content due to changes in atmospheric humidity make several percent difference in range. The range in Ilford glass is found to be 18±{}4 percent longer than in dry C-2 emulsion.
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Bradner et al. (1950) studied this question.
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