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Microdosimetry for a carbon ion beam using track-etched detectors.

I Ambrožová1, V Vondráček2, M Šefl3

  • 1Department of Radiation Dosimetry, Nuclear Physics Institute of the CAS, Na Truhlářce 39/64, Prague 180 00, Czech Republic.

Radiation Protection Dosimetry
|April 12, 2015
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Summary

Track-etched detectors (TED) effectively measure linear energy transfer (LET) spectra in carbon ion beams for radiotherapy. These measurements are crucial for understanding dose distribution and optimizing cancer treatments.

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Area of Science:

  • Medical physics
  • Radiation oncology
  • Detector technology

Background:

  • Track-etched detectors (TED) are established tools for linear energy transfer (LET) spectrometry in heavy ion therapy.
  • Accurate microdosimetry is essential for optimizing therapeutic efficacy and minimizing side effects in carbon ion radiotherapy.

Purpose of the Study:

  • To evaluate the performance of TED in measuring LET spectra and depth-dose distributions for a therapeutic carbon ion beam.
  • To assess the contribution of un-detected particles to the total absorbed dose using Geant4 simulations.

Main Methods:

  • Measurements of LET spectra and depth-dose distribution using TED for a 290 MeV u(-1) carbon ion beam at various depths.
  • Characterization of LET spectra within and outside the primary beam.
  • Utilizing Geant4 toolkit (v4.9.6.P01) to simulate and quantify the dose from low-LET particles not registered by TED.

Main Results:

  • TED successfully measured LET spectra and depth-dose profiles of the carbon ion beam.
  • The study identified the LET threshold for TED detection (8-10 keV µm(-1)) and the impact of un-detected particles.
  • Geant4 simulations provided an estimate of the absorbed dose contribution from electrons and lower-LET ions.

Conclusions:

  • Track-etched detectors are applicable for microdosimetry in therapeutic carbon ion beams.
  • The findings support the use of TED for quality assurance and treatment planning in heavy ion therapy.
  • Combining TED measurements with simulations offers a comprehensive approach to characterizing radiation fields in particle therapy.