Abstract
The Bethe-Bloch theory of stopping, including shell corrections and the density-effect correction, is used to calculate theoretical ranges for standard Ilford G.5 emulsion. Only the mean ionization potential is an adjustable parameter. Making corrections for theK shells of all emulsion atoms except hydrogen, and also correcting for theL shells of iodine, silver, and bromine, one can obtain a fit to the measured ranges for protons of 1 to 700 MeV. The mean ionization potential found is (331 ±6) eV, andI/Z has a value of (12.1 ±0.2) eV as an average for all emulsion elements except hydrogen. At low velocities the hydrogenlike atomic model used in the shell-correction calculations appears to over-accentuate the shell effects. A better agreement with the experimental data for proton energies below 40 MeV is obtained semiempirically. A range table for emulsion of standard density is given. A calculated range table for water, useful for adjusting ranges measured under nonstandard density conditions, is also included.
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