Dose distribution outside the target volume for 170-MeV proton beam.
Dose delivered outside the proton field during radiotherapy can potentially lead to secondary cancer development. Measurements with a 170-MeV proton beam were performed with passive detectors (track etched detectors and thermoluminescence dosemeters) in three different depths along the Bragg curve. The measurement showed an uneven decrease of the dose outside of the beam field with local enhancements. The major contribution to the delivered dose is due to high-energy protons with linear energy transfer (LET) up to 10 keV µm(-1). However, both measurement and preliminary Monte Carlo calculation also confirmed the presence of particles with higher LET.
Department of Applied Physics, Chalmers University of Technology, Fysikgården 4, Göteborg SE-412 96, Sweden Department of Radiation Dosimetry, Nuclear Physics Institute of the ASCR, Na Truhlářce 39/64, 180 00 Prague, Czech Republic brabcova@chalmers.se.
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Pachnerová Brabcová
Department of Radiation Dosimetry, Nuclear Physics Institute of the ASCR, Na Truhlářce 39/64, 180 00 Prague, Czech Republic.
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Ambrožová
Department of Radiation Dosimetry, Nuclear Physics Institute of the ASCR, Na Truhlářce 39/64, 180 00 Prague, Czech Republic Faculty of Nuclear Sciences and Physical Engineering, Czech Technical University in Prague, Břehová 7, 115 19 Prague, Czech Republic.
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Kubančák
Department of Applied Physics, Chalmers University of Technology, Fysikgården 4, Göteborg SE-412 96, Sweden.
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Puchalska
Proton Therapy Center Czech, Budínova 2437/1a, 180 00 Prague, Czech Republic.
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Vondráček
Joint Institute for Nuclear Research, Joliot-Curie 6, 141980 Dubna, Russia.
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Molokanov
Department of Applied Physics, Chalmers University of Technology, Fysikgården 4, Göteborg SE-412 96, Sweden.
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Sihver
Department of Radiation Dosimetry, Nuclear Physics Institute of the ASCR, Na Truhlářce 39/64, 180 00 Prague, Czech Republic.
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Davídková
D004867:Equipment Design; D006801:Humans; D018499:Linear Energy Transfer; D009010:Monte Carlo Method; D009502:Neutrons; D019047:Phantoms, Imaging; D019904:Polymethyl Methacrylate / Q000737:chemistry; D061766:Proton Therapy / Q000009:adverse effects; D011522:Protons; D011874:Radiometry / Q000295:instrumentation* / Q000379:methods*; D011878:Radiotherapy / Q000009:adverse effects; D011879:Radiotherapy Dosage; D011880:Radiotherapy Planning, Computer-Assisted; D011882:Radiotherapy, High-Energy; D015203:Reproducibility of Results; D012426:Russia; D013819:Thermoluminescent Dosimetry / Q000295:instrumentation* / Q000379:methods*
D011522:Protons; D019904:Polymethyl Methacrylate