Radiation quality of cosmic ray nuclei studied with Geant4-based simulations

FAIR NExt generation of ScientistS 2013

Burigo, Lucas N.^1,2 ; Pshenichnov, Igor A.^1,3 ; Mishustin, Igor N.^1,4 ; Bleicher, Marcus^1,2

Frankfurt Institute for Advanced Studies, Johann Wolfgang Goethe University, 60438 Frankfurt am Main, Germany^1

Institut für Theoretische Physik, Johann Wolfgang Goethe University, 60438 Frankfurt am Main, Germany^2

Institute for Nuclear Research, Russian Academy of Sciences, 117312 Moscow, Russia^3

Kurchatov Institute, Russian Research Center, 123182 Moscow, Russia^4

关键词: Cosmic-ray nucleus;    Fragmentation reactions;    Galactic cosmic rays;    High charge and energy particles;    Monte Carlo model for heavy-ion therapies;    Nuclear fragmentation;    Relative biological effectiveness;    Spacecraft materials;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/503/1/012021/pdf
DOI  :  10.1088/1742-6596/503/1/012021

来源: IOP

【 摘 要 】

In future missions in deep space a space craft will be exposed to a non-negligible flux of high charge and energy (HZE) particles present in the galactic cosmic rays (GCR). One of the major concerns of manned missions is the impact on humans of complex radiation fields which result from the interactions of HZE particles with the spacecraft materials. The radiation quality of several ions representing GCR is investigated by calculating microdosimetry spectra. A Geant4-based Monte Carlo model for Heavy Ion Therapy (MCHIT) is used to simulate microdosimetry data for HZE particles in extended media where fragmentation reactions play a certain role. Our model is able to reproduce measured microdosimetry spectra for H, He, Li, C and Si in the energy range of 150-490 MeV/u. The effect of nuclear fragmentation on the relative biological effectiveness (RBE) of He, Li and C is estimated and found to be below 10%.