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Pietrzak M, Nettelbeck H, Perrot Y, Villagrasa C, Bancer A, Bug M, Incerti S. Intercomparison of nanodosimetric distributions in nitrogen simulated with Geant4 and PTra track structure codes. Phys Med 2022; 102:103-109. [PMID: 36162229 DOI: 10.1016/j.ejmp.2022.09.003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/06/2022] [Revised: 07/25/2022] [Accepted: 09/12/2022] [Indexed: 11/29/2022] Open
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.
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Affiliation(s)
- Marcin Pietrzak
- 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.
| | - Heidi Nettelbeck
- Physikalisch-Technische Bundesanstalt (PTB), Bundesallee 100, 38116 Braunschweig, Germany; European Radiation Dosimetry Group e.V. (Eurados), Ingolstädter Landstrasse 1, Neuherberg, 85764, Germany
| | - Yann Perrot
- 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
| | - Carmen Villagrasa
- 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
| | - Aleksandr Bancer
- 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
| | - Marion Bug
- Physikalisch-Technische Bundesanstalt (PTB), Bundesallee 100, 38116 Braunschweig, Germany; European Radiation Dosimetry Group e.V. (Eurados), Ingolstädter Landstrasse 1, Neuherberg, 85764, Germany
| | - Sebastien Incerti
- Université de Bordeaux, CNRS, LP2I Bordeaux, UMR 5797, 19 Chemin du Solarium, 33170 Gradignan, France; Geant4-DNA Collaboration
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Villagrasa C, Rabus H, Baiocco G, Perrot Y, Parisi A, Struelens L, Qiu R, Beuve M, Poignant F, Pietrzak M, Nettelbeck H. Intercomparison of micro- and nanodosimetry Monte Carlo simulations: An approach to assess the influence of different cross-sections for low-energy electrons on the dispersion of results. RADIAT MEAS 2022. [DOI: 10.1016/j.radmeas.2021.106675] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Bug MU, Gargioni E, Baek WY, Hilgers G, Nettelbeck H, Rosenfeld AB, Rabus H. Proton-impact ionisation cross sections for nanodosimetric track structure simulations. RADIATION PROTECTION DOSIMETRY 2014; 161:474-477. [PMID: 24324254 DOI: 10.1093/rpd/nct317] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Monte Carlo simulations of the particle track structure require accurate ion- and electron-impact cross-section data of the medium. These data are scarce and often inconsistent when measured by different groups. In this work, literature data on ionisation cross sections (CSs) of nitrogen and propane for protons with energies 0.1-10 MeV are reviewed and implemented in the code PTra. Methane data were used to obtain proton-impact CSs of propane due to their absence in the literature. PTra is benchmarked by comparing simulated particle-track parameters to experimental results, measured with an ion-counting nanodosemeter.
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Affiliation(s)
- M U Bug
- Physikalisch-Technische Bundesanstalt (PTB), Bundesallee 100, 38116 Braunschweig, Germany Centre for Medical Radiation Physics (CMRP), University of Wollongong, Wollongong, NSW 2522, Australia
| | - E Gargioni
- University Medical Center Hamburg-Eppendorf, Martinistrasse 52, 20246 Hamburg, Germany
| | - W Y Baek
- Physikalisch-Technische Bundesanstalt (PTB), Bundesallee 100, 38116 Braunschweig, Germany
| | - G Hilgers
- Physikalisch-Technische Bundesanstalt (PTB), Bundesallee 100, 38116 Braunschweig, Germany
| | - H Nettelbeck
- Physikalisch-Technische Bundesanstalt (PTB), Bundesallee 100, 38116 Braunschweig, Germany
| | - A B Rosenfeld
- Centre for Medical Radiation Physics (CMRP), University of Wollongong, Wollongong, NSW 2522, Australia
| | - H Rabus
- Physikalisch-Technische Bundesanstalt (PTB), Bundesallee 100, 38116 Braunschweig, Germany
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