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Intercomparison of nanodosimetric distributions in nitrogen simulated with Geant4 and PTra track structure codes

  • Marcin Pietrzak
    Correspondence
    Corresponding author at: National Centre for Nuclear Research (NCBJ), Andrzeja Sołtana 7, 05400 Otwock, Poland.
    Affiliations
    National Centre for Nuclear Research (NCBJ), Andrzeja Sołtana 7, 05400 Otwock, Poland

    European Radiation Dosimetry Group e.V. (Eurados), Ingolstädter Landstrasse 1, Neuherberg, 85764, Germany
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  • Heidi Nettelbeck
    Affiliations
    Physikalisch-Technische Bundesanstalt (PTB), Bundesallee 100, 38116 Braunschweig, Germany

    European Radiation Dosimetry Group e.V. (Eurados), Ingolstädter Landstrasse 1, Neuherberg, 85764, Germany
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  • Yann Perrot
    Affiliations
    Institut de Radioprotection et de Sûreté Nucléaire (IRSN), 31 Avenue de la Division Leclerc, 92260 Fontenay-Aux-Roses, France

    European Radiation Dosimetry Group e.V. (Eurados), Ingolstädter Landstrasse 1, Neuherberg, 85764, Germany

    Geant4-DNA Collaboration
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  • Carmen Villagrasa
    Affiliations
    Institut de Radioprotection et de Sûreté Nucléaire (IRSN), 31 Avenue de la Division Leclerc, 92260 Fontenay-Aux-Roses, France

    European Radiation Dosimetry Group e.V. (Eurados), Ingolstädter Landstrasse 1, Neuherberg, 85764, Germany

    Geant4-DNA Collaboration
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  • Aleksandr Bancer
    Affiliations
    National Centre for Nuclear Research (NCBJ), Andrzeja Sołtana 7, 05400 Otwock, Poland

    European Radiation Dosimetry Group e.V. (Eurados), Ingolstädter Landstrasse 1, Neuherberg, 85764, Germany
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  • Marion Bug
    Affiliations
    Physikalisch-Technische Bundesanstalt (PTB), Bundesallee 100, 38116 Braunschweig, Germany

    European Radiation Dosimetry Group e.V. (Eurados), Ingolstädter Landstrasse 1, Neuherberg, 85764, Germany
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  • Sebastien Incerti
    Affiliations
    Université de Bordeaux, CNRS, LP2I Bordeaux, UMR 5797, 19 Chemin du Solarium, 33170 Gradignan, France

    Geant4-DNA Collaboration
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Published:September 23, 2022DOI:https://doi.org/10.1016/j.ejmp.2022.09.003

      Highlights

      • Implementation of electron cross-sections in nitrogen down to ionisation threshold in Geant4-DNA.
      • Consistency check of Geant4-DNA and PTra Monte Carlo track-structure codes.
      • Good agreement between results of simulations performed using both codes.

      Abstract

      To facilitate the use of Geant4-DNA for radiation transport simulations in micro- and nanodosimeters, which are physically operated with tissue-equivalent gases such as nitrogen (and propane), this work aims to extend the cross section data available in Geant4-DNA to include those of nitrogen for electron energies ranging from 1 MeV down to the ionisation threshold. To achieve this, interaction cross section data for nitrogen that have been used with the in-house PTB PTra track structure code have been implemented in the current state-of-the-art Geant4-DNA simulation toolkit. An intercomparison has been performed between the two codes to validate this implementation. To quantify the agreement between the cross section models for nitrogen adopted in PTra and those implemented in Geant4-DNA, the simulation results of both codes were analysed using three physical parameters describing the ionisation cluster size distribution (ICSD): mean ionisation cluster size, variance of the cluster size and the probability to obtain a single ionisation within the target. Statistical analysis of the results indicates that the interaction cross section models for nitrogen used in PTra (elastic scattering, impact ionisations and electronic excitations) have been successfully implemented in Geant4-DNA. In addition, simulated ICSDs were compared to those measured with the Jet Counter nanodosimeter for energies between 100 and 2000 eV. For greater energies, the ICRP data for LET and particle range were used as a reference. The modified Geant4-DNA code and data successfully passed all these benchmarks fulfilling the requirement for their public release in the next version of the Geant4 toolkit.

      Keywords

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