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Mapping initial and...
Mapping initial and general recombination in scanning proton pencil beams
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- Christensen, J. B. (författare)
- Tech Univ Denmark, Ctr Nucl Technol, Roskilde, Denmark.
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- Almhagen, Erik (författare)
- Uppsala universitet,Medicinsk strålningsvetenskap
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- Stolarczyk, L. (författare)
- Skandionkliniken, Uppsala, Sweden.;Polish Acad Sci Krakow, Bronowice Cyclotron Ctr, Inst Nucl Phys, Krakow, Poland.
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- Liszka, M. (författare)
- Polish Acad Sci Krakow, Bronowice Cyclotron Ctr, Inst Nucl Phys, Krakow, Poland.
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- Hernandez, G. G. (författare)
- Aarhus Univ, Dept Phys & Astron, Aarhus, Denmark.
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- Bassler, Niels (författare)
- Stockholms universitet,Fysikum,Karolinska Institutet, Sweden; Aarhus University Hospital, Denmark,Stockholm Univ, Dept Phys, Med Radiat Phys, Stockholm, Sweden.;Karolinska Inst, Dept Oncol & Pathol, Med Radiat Phys, Stockholm, Sweden.;Aarhus Univ Hosp, Dept Expt Clin Oncol, Aarhus, Denmark.
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- Nørrevang, O. (författare)
- Aarhus Univ Hosp, Danish Ctr Particle Therapy, Aarhus, Denmark.
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- Vestergaard, A. (författare)
- Aarhus Univ Hosp, Danish Ctr Particle Therapy, Aarhus, Denmark.
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Tech Univ Denmark, Ctr Nucl Technol, Roskilde, Denmark Medicinsk strålningsvetenskap (creator_code:org_t)
- 2020-06-05
- 2020
- Engelska.
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Ingår i: Physics in Medicine and Biology. - : IOP Publishing. - 0031-9155 .- 1361-6560. ; 65:11
- Relaterad länk:
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https://urn.kb.se/re...
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https://doi.org/10.1...
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https://urn.kb.se/re...
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http://kipublication...
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Abstract
Ämnesord
Stäng
- The ion recombination is examined in parallel-plate ionization chambers in scanning proton beams at the Danish Centre for Particle Therapy and the Skandion Clinic. The recombination correction factor k(s) is investigated for clinically relevant energies between 70 MeV and 244 MeV for dose rates below 400 Gy min(-1) in air. The Boutillon formalism is used to separate the initial and general recombination. The general recombination is compared to predictions from the numerical recombination code IonTracks and the initial recombination to the Jaffe theory. k(s) is furthermore calculated with the two-voltage method (TVM) and extrapolation approaches, in particular the recently proposed three-voltage (3VL) method. The TVM is in agreement with the Boutillon method and IonTracks for dose rates above 100 Gy min(-1). However, the TVM calculated k(s) is closer related to the Jaffe theory for initial recombination for lower dose rate, indicating a limited application in scanning light ion beams. The 3VL is in turn found to generally be in agreement with Boutillon's method. The recombination is mapped as a function of the dose rate and proton energy at the two centres using the Boutillon formalism: the initial recombination parameter was found to be A = (0.10 +/- 0.01) V at DCPT and A = (0.22 +/- 0.13) V at Skandion, which is in better agreement with the Jaffe theory for initial recombination than previously reported values. The general recombination parameter was estimated to m2=(4.7 +/- 0.1).103V2nA-1cm-1m2=(7.2 +/- 0.1).103V2nA-1cm-1
Ämnesord
- MEDICIN OCH HÄLSOVETENSKAP -- Klinisk medicin -- Radiologi och bildbehandling (hsv//swe)
- MEDICAL AND HEALTH SCIENCES -- Clinical Medicine -- Radiology, Nuclear Medicine and Medical Imaging (hsv//eng)
- NATURVETENSKAP -- Fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences (hsv//eng)
Nyckelord
- ion recombination
- initial recombination
- general recombination
- particle therapy
- particle dosimetry
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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