Electronic stopping power for proton in amino acids and protein in 0.05–10 MeV range

The stopping powers for 0.05–10 MeV protons in a group of 15 amino acids and a protein have been systematically calculated. The calculations are based on Ashley’s dielectric model. An approach of evaluating the optical energy loss function is incorporated into the Ashley’s model because no experimental optical data are available for these bioorganic compounds. The Barkas-effect correction and Bloch correction are included and an empirical minimum impact parameter a is used for the Barkas-effect correction. The proton stopping powers for the 15 amino acids and the protein in the energy range from 0.05 to 10 MeV are presented here for the first time and might be useful for studies of various radiation effects in these materials.