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.

Department of Radiation Dosimetry Nuclear Physics Institute of the CAS Na Truhlářce 39 64 Prague 180 00 Czech Republic

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

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

Faculty of Nuclear Sciences and Physical Engineering Czech Technical University Prague Břehová 7 Prague 115 19 Czech Republic

Proton Therapy Center Budínova 2437 1a 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

Citace poskytuje Crossref.org