title: Microdosimetry for a carbon ion beam using track-etched detectors.
abstract: Track-etched detectors (TED) have been used as linear energy transfer (LET) spectrometers in heavy ion beams for many years. LET spectra and depth-dose distribution of a carbon ion beam were measured behind polymethylmethacrylate degraders at Heavy Ion Medical Accelerator in Chiba, Japan. The measurements were performed along monoenergetic beam with energy 290 MeV u(-1) in different positions: (1) at beam extraction area, (2) at beginning, (3) maximum and (4) behind the Bragg peak region (0, 117, 147 and 151 mm of water-equivalent depth, respectively). The LET spectra inside and outside of the primary ion beam have been evaluated. TED record only heavy charged particles with LET above 8-10 keV µm(-1), while electrons and ions with lower LET are not detected. The Geant4 simulation toolkit version 4.9.6.P01 has been used to estimate the contribution of non-detected particles to absorbed dose. Presented results demonstrate the applicability of TED for microdosimetry measurements in therapeutic carbon ion beams.
authors: Department of Radiation Dosimetry, Nuclear Physics Institute of the CAS, Na Truhlářce 39/64, Prague 180 00, Czech Republic.
authors: I
authors: I
authors: Ambrožová
authors: Proton Therapy Center, Budínova 2437/1a, Prague 180 00, Czech Republic.
authors: V
authors: V
authors: Vondráček
authors: Faculty of Nuclear Sciences and Physical Engineering, Czech Technical University in Prague, Břehová 7, Prague 115 19, Czech Republic.
authors: M
authors: M
authors: Šefl
authors: Department of Radiation Dosimetry, Nuclear Physics Institute of the CAS, Na Truhlářce 39/64, Prague 180 00, Czech Republic Université de Bordeaux, CNRS/IN2P3, Centre d'Etudes Nucléaires de Bordeaux-Gradignan, CENBG, Chemin du Solarium, BP 120, Gradignan 33175, France.
authors: V
authors: V
authors: Štěpán
authors: Department of Radiation Dosimetry, Nuclear Physics Institute of the CAS, Na Truhlářce 39/64, Prague 180 00, Czech Republic Department of Applied Physics, Chalmers University of Technology, Fysikgränd 3, Göteborg SE-412 96, Sweden.
authors: K
authors: K
authors: Pachnerová Brabcová
authors: Department of Radiation Dosimetry, Nuclear Physics Institute of the CAS, Na Truhlářce 39/64, Prague 180 00, Czech Republic.
authors: O
authors: O
authors: Ploc
authors: Université de Bordeaux, CNRS/IN2P3, Centre d'Etudes Nucléaires de Bordeaux-Gradignan, CENBG, Chemin du Solarium, BP 120, Gradignan 33175, France.
authors: S
authors: S
authors: Incerti
authors: Department of Radiation Dosimetry, Nuclear Physics Institute of the CAS, Na Truhlářce 39/64, Prague 180 00, Czech Republic davidkova@ujf.cas.cz.
authors: M
authors: M
authors: Davídková
mesh_terms: D002138:Calibration; D002244:Carbon; D003198:Computer Simulation; D004583:Electrons; D004867:Equipment Design; D020450:Heavy Ions; D018499:Linear Energy Transfer / Q000528:radiation effects*; D055616:Microtechnology / Q000379:methods*; D010315:Particle Accelerators / Q000295:instrumentation*; D019904:Polymethyl Methacrylate / Q000737:chemistry*; D011829:Radiation Dosage; D011874:Radiometry / Q000295:instrumentation*
chemical_list: D002244:Carbon; D019904:Polymethyl Methacrylate