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Monte Carlo model for ion mobility and diffusion for characteristic electric fields in nanodosimetry.
Kempf, Irina; Schneider, Uwe.
Afiliación
  • Kempf I; Department of Physics, University of Zurich, Winterthurerstrasse 190, 8032 Zurich, Switzerland. Electronic address: irina.kempf@uzh.ch.
  • Schneider U; Department of Physics, University of Zurich, Winterthurerstrasse 190, 8032 Zurich, Switzerland; Radiotherapy Hirslanden, Witellikerstrasse 40, 8032 Zurich, Switzerland.
Z Med Phys ; 34(1): 140-152, 2024 Feb.
Article en En | MEDLINE | ID: mdl-36803393
ABSTRACT
The quantification of the effects of space radiation for manned spaceflight can be approximated by nanodosimetric measurements. For the development of nanodosimetric detectors, a Monte Carlo model for ion mobility and diffusion for characteristic electric fields is presented. This model can be used to describe the interactions of ions in their parent gas based solely on commonly known input parameters, such as the ionization potential, kinetic diameter, molar mass, and polarizability of the gas. A model for approximating the resonant charge exchange cross section has been proposed, requiring only the ionization energy and mass of the parent gas as input parameters. The method proposed in this work was tested against experimental drift velocity data for a wide range of gases (helium, neon, nitrogen, argon, krypton, carbon monoxide, carbon dioxide, oxygen, propane). The transverse diffusion coefficients were compared to experimental values for helium, nitrogen, neon, argon, and propane gas. With the Monte Carlo code and resonant charge exchange cross section approximation model presented in this work, it is now possible to calculate an estimate of the drift velocities, transverse diffusion, and thus the ion mobility of ions in their parent gas. This is essential for further nanodosimetric detector development, as those parameters are often not well known for the gas mixtures used in nanodosimetry.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Propano / Helio Tipo de estudio: Prognostic_studies Idioma: En Revista: Z Med Phys Asunto de la revista: RADIOTERAPIA Año: 2024 Tipo del documento: Article

Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Propano / Helio Tipo de estudio: Prognostic_studies Idioma: En Revista: Z Med Phys Asunto de la revista: RADIOTERAPIA Año: 2024 Tipo del documento: Article