Energy Loss Straggling of Hydrogen Ions in DNA Target

To understand and control radiation damage of living tissues, it is necessary to describe an accurate description the energy loss and energy loss straggling of ion beam to target. In present work the energy loss straggling of proton beam in DNA has been calculated using the dielectric of plasmonpole approximation (PPA) formula. This procedure has been used to calculate the electronic excitation probability of DNA as a function of the transferred energy by the swift projectile as well as the average energy of the target. A charge exchange has been taken in the consideration. Our results show that the most probable electronic excitations have energies in the range E ≈ (10-20)eV, particularly for projectile energies T ≤ 100 keV The maximum probability of excite electrons decreases as the projectile energy T increases.