Abstract
Ionization cross-section calculations are analytically presented for proton collisions from DNA nucleobases guanine, adenine, thymine, and cytosine based upon the semi-empirical Rudd model. New parameterizations are used to calculate the excitation and change–charge cross-sections from liquid water. We explored the differential electron cross-sections of biological atom shells to calculate the total stopping cross section for protons with DNA bases. We, therefore, studied the Bragg peak position for protons in a wide range from 100 eV to 20 MeV of impact energy. The obtained results showed a reasonable agreement with available experimental data and calculations from Monte-Carlo (MC) method, GEANT4, and SRIM toolkits.
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