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3D Visualization of Monte-Carlo Simulation's of HZE Track Structure and Initial Chemical SpeciesHeavy ions biophysics is important for space radiation risk assessment [1] and hadron-therapy [2]. The characteristic of heavy ions tracks include a very high energy deposition region close to the track (<20 nm) denoted as the track core, and an outer penumbra region consisting of individual secondary electrons (6-rays). A still open question is the radiobiological effects of 6- rays relative to the track core. Of importance is the induction of double-strand breaks (DSB) [3] and oxidative damage to the biomolecules and the tissue matrix, considered the most important lesions for acute and long term effects of radiation. In this work, we have simulated a 56Fe26+ ion track of 1 GeV/amu with our Monte-Carlo code RITRACKS [4]. The simulation results have been used to calculate the energy depiction and initial chemical species in a "voxelized" space, which is then visualized in 3D. Several voxels with dose >1000 Gy are found in the penumbra, some located ~0.1 mm from the track core. In computational models, the DSB induction probability is calculated with radial dose [6], which may not take into account the higher RBE of electron track ends for DSB induction. Therefore, these simulations should help improve models of DSB induction and our understanding of heavy ions biophysics.
Document ID
20090031771
Acquisition Source
Johnson Space Center
Document Type
Conference Paper
Authors
Plante, Ianik
(Universities Space Research Association Houston, TX, United States)
Cucinotta, Francis A.
(NASA Johnson Space Center Houston, TX, United States)
Date Acquired
August 24, 2013
Publication Date
January 1, 2009
Subject Category
Space Radiation
Report/Patent Number
JSC-CN-18763
Meeting Information
Meeting: MICROS 2009 - 15th International Symposium on Microdosimetry
Location: Verona
Country: Italy
Start Date: October 25, 2009
End Date: October 30, 2009
Distribution Limits
Public
Copyright
Other

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