Physico-Chemical Events

Sunday, October 16, 2005 3:00 PM-5:00 PM Exhibit Hall

(PP008) Track structure simulations of relativistic heavy charged particles.

Dingfelder, Michael*,1, Jorjishvili, Irakli1, Gersh, Jacob1, Toburen, Larry1, 1 Department of Physics, Greenville, NC, USA

ABSTRACT- Monte Carlo (MC) track structure simulations are widely used in radiation biology to provide detailed spatial information on energy deposition and on the production of radiation damage to DNA and other cellular structures. MC codes follow charged particles event by event from starting energies down to total stopping and require reliable interaction cross sections with the material under consideration. Relativistic heavy charged (HZE) particles contained in Galactic Cosmic Radiation are of special interest to NASA and the vision of human deep-space travel like the Mars mission. Little is known of the action of HZE particles on the human body since they are deflected by the Earth magnetic field. With this in mind we have developed a module for the MC simulation code PARTRAC to simulate the tracks of bare (i.e., fully ionized) heavy ions in liquid water for energies from 1 GeV/nucleon down to approximately 100 keV/nucleon. We have developed an interaction model for HZE particles that relates HZE interaction cross sections to ionization cross sections of protons by scaling laws. Furthermore, we have updated and extended the currently in PARTRAC implemented proton cross sections to better reflect condensed phase and relativistic effects. This work is supported in part by NASA Grant NNJ04HF39G and by DoE Grant DE-FG02-01ER-63233.

Key words: HZE particles, track structure simulations

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2005 RRS