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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
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.
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.
