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Monte Carlo, track structure calculations of low energy particles in liquid water.

Abstract : Track structure calculations of charged particles are very useful for understanding the irradiation early stage damages in biological matter. Our calculations are mainly concentrated on protons, alphas and electrons interactions. For simplicity, liquid water is considered since it represents the major component of biological environment Protons, alphas and electrons can loose a part or the total of their energy in ionizations, excitations and charge transfer processes. In a first approach, we use the Born theory as described by Dingfelder et al. (2000), for the inelastic cross sections calculations. Elastic collisions are taken into account for electrons as described by Brenner & Zaider (1983) and by Emfietzoglou (2000), and are neglected in the case of protons and alphas. The Born theory, becomes no more valid at low incident projectile energies, semi-empirical models are used instead. Several different semi-empirical models are proposed; like the Rudd (1988) model for protons ionizations, the Miller & Green (1973) model for protons and alphas excitations as well as for total ionization cross section calculations. The charge transfer process is also taken into account for protons and for alphas, it is described by Dingfelder et al. (2000) and by Uehara et al. (2000). Processes are to be implemented in GEANT4 monte carlo simulation code, and be ready to use in several sub- microscopic simulations of dose measuring and stopping power estimation for particles in biological matter. These processes are able to track electrons till very low energies (~7eV), protons till ~100eV and alphas till ~1keV. However these processes could be very time consuming and are unsuitable for macroscopic applications. They can only be used in liquid water volumes, extensions for other type of needed materials are to be studied in the future.
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http://hal.in2p3.fr/in2p3-00025156
Contributor : Jeanine Pellet <>
Submitted on : Friday, December 2, 2005 - 10:15:04 AM
Last modification on : Thursday, January 11, 2018 - 6:13:59 AM

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  • HAL Id : in2p3-00025156, version 1

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Z. Francis, Gerard Montarou. Monte Carlo, track structure calculations of low energy particles in liquid water.. 10th International Conference Geant4 2005, Nov 2005, Bordeaux, France. ⟨in2p3-00025156⟩

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