1. Radial electron fluence around ion tracks as a new physical parameter for the detection threshold of PADC using Geant4-DNA toolkit
- Author
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Ziad El Bitar, Tomoya Yamauchi, Keiji Oda, Abdel-Mjid Nourreddine, Pierre Gillet, Andrew D. Bass, M. Kanasaki, Michel Fromm, Léon Sanche, Nicolas Arbor, Hisaya Kurashige, Tamon Kusumoto, Satoshi Kodaira, Pierre Cloutier, Rémi Barillon, Shogo Okada, Yutaka Mori, Institut Pluridisciplinaire Hubert Curien (IPHC), Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS), Université Bourgogne Franche-Comté [COMUE] (UBFC), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS), and Université de Strasbourg (UNISTRA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)
- Subjects
[PHYS]Physics [physics] ,Detection threshold ,Radiation ,Materials science ,Proton ,Geant4-DNA ,Ion track ,Latent track ,Monte Carlo method ,REFIT ,02 engineering and technology ,Electron ,021001 nanoscience & nanotechnology ,Secondary electrons ,PADC ,030218 nuclear medicine & medical imaging ,Computational physics ,Ion ,03 medical and health sciences ,0302 clinical medicine ,Stopping power (particle radiation) ,Impact parameter ,0210 nano-technology ,Instrumentation - Abstract
International audience; The detection threshold of poly(allyl dyglycol carbonate), PADC, for C ions is determined as 55 eV/nm in stopping power, which is significantly higher than that for proton and He ions. The stopping power is not a universal parameter for expressing the detection threshold of PADC. A new physical parameter of Radial Electron Fluence around Ion Tracks, REFIT, is proposed to describe the detection threshold of PADC. It is defined as the number density of electrons passing through the surface of a cylinder of a certain radius that is co-axial with the trajectory. Furthermore, preliminary calculations are presently being performed using the Monte Carlo simulation code of Geant4-DNA. The values of the REFIT at the detection thresholds for each ion are of the same order. Several issues affecting implementation of the REFIT paramter are discussed. These include the effects of impact parameter relating to the initial locations of secondary electrons, the effects of electron attachment below the cut off energy of 7.4 eV and the necessity of a more physically realistic medium than water for Monte Carlo simultaions.
- Published
- 2018
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