García Molina, Rafael, Abril, Isabel, Denton Zanello, Cristian D., Heredia-Avalos, Santiago, Kyriakou, Ioanna, Emfietzoglou, Dimitris
Calculated depth-dose distributions for H+ and He+ beams in liquid water
GARCIA-MOLINA, Rafael, et al. “Calculated depth-dose distributions for H+ and He+ beams in liquid water”. Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms. Vol. 267, No. 16 (15 Aug. 2009). ISSN 0168-583X, pp. 2647-2652
URI: http://hdl.handle.net/10045/25434
DOI: 10.1016/j.nimb.2009.05.038
ISSN: 0168-583X (Print)
Abstract:
We have calculated the dose distribution delivered by proton and helium beams in liquid water as a function of the target-depth, for incident energies in the range 0.5–10 MeV/u. The motion of the projectiles through the stopping medium is simulated by a code that combines Monte Carlo and a finite differences algorithm to consider the electronic stopping power, evaluated in the dielectric framework, and the multiple nuclear scattering with the target nuclei. Changes in projectile charge-state are taken into account dynamically as it moves through the target. We use the MELF–GOS model to describe the energy loss function of liquid water, obtaining a value of 79.4 eV for its mean excitation energy. Our calculated stopping powers and depth-dose distributions are compared with those obtained using other methods to describe the energy loss function of liquid water, such as the extended Drude and the Penn models, as well as with the prediction of the SRIM code and the tables of ICRU.
Keywords:Bragg peak, Liquid water, Depth-dose distributions, Energy loss function, Stopping power, Dielectric formalism, Mean excitation energy
Elsevier
info:eu-repo/semantics/article