Microdosimetry for a carbon ion beam using track-etched detectors
Artikel i vetenskaplig tidskrift, 2015

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.


I. Ambrozova

Czech Academy of Sciences

V. Vondracek

M. Šefl

Ceske Vysoke Uceni Technicke v Praze

V. Stepan

Centre d'Etudes Nucleaires de Bordeaux Gradignan

Czech Academy of Sciences

Katerina Pachnerova Brabcová

Chalmers, Teknisk fysik, Nukleär teknik

Ondrej Ploc

Czech Academy of Sciences

S. Incerti

Centre d'Etudes Nucleaires de Bordeaux Gradignan

M. Davidkova

Czech Academy of Sciences

Radiation Protection Dosimetry

0144-8420 (ISSN)

Vol. 166 1-4 247-252


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