Majer, Marija; Pasariček, Luka; Brkić, Hrvoje; Davídková, Marie; Navrátil, Matěj; Vondráček, Vladimír; Knežević, Željka (2023) Relative efficiency of radiophotoluminescent glass dosimeters in a scanning pencil proton beam. Radiation Physics and Chemistry, 216 . ISSN 0969-806X
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Abstract
The increasing role of hadron therapy, and particularly of proton therapy, in cancer treatment requires dosimetric characterization of luminescent detectors in heavy charged particle beams. The ionization density, which is related to the linear energy transfer (LET), is changing when heavy charged particle is penetrating through a material. Therefore, it is crucial to evaluate how efficiency of the used dosimeters depends on the change in LET. The aim of this study was to evaluate relative efficiency of radiophotoluminescent (RPL) glass dosimeters (type GD-352M) in a clinical scanning pencil proton beam of 100 MeV and compare it to the results obtained with thermoluminescent (TL) dosimeters (type TLD-100). LETf and LETd at the selected dosimeter's position were evaluated and compared by two Monte Carlo codes (MCNP and PHITS). Linear dose response is precondition for the evaluation of dosimeter efficiency and first, dose response in proton beam was evaluated and compared with those in 60Co gamma ray field. Linear dose response up to 9 Gy was confirmed for RPLs in proton beam, and gamma ray field. For TLDs, supralinearity from about 5 Gy was observed. A constant relative efficiency is observed along the plateau (corresponding to LETf from 0.7 keV/μm to 1.7 keV/μm) of non-modulated proton beam with an average value 1.00 ± 0.02 for RPL and 0.97 ± 0.02 for TL dosimeters. Relative efficiency decrease of 10 % is observed for RPLs within the Bragg peak with LETf = 2.3 keV/μm. Future work will be focused on the evaluation of the efficiency for higher LET values using more energetic proton beams and precise positioning along the Bragg peak.
| Item Type: | Article | ||||||||
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| Uncontrolled Keywords: | dose response ; relative efficiency ; RPL glass dosimeter ; TLD-100 ; proton therapy | ||||||||
| Subjects: | NATURAL SCIENCES > Physics > Biophysics and Medical Physics NATURAL SCIENCES > Interdisciplinary Natural Sciences > Radiation Science |
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| Divisions: | Division of Materials Chemistry | ||||||||
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| Depositing User: | Željka Knežević Medija | ||||||||
| Date Deposited: | 16 Dec 2025 15:09 | ||||||||
| URI: | http://fulir.irb.hr/id/eprint/10340 | ||||||||
| DOI: | 10.1016/j.radphyschem.2023.111396 |
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