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Relative efficiency of radiophotoluminescent glass dosimeters in a scanning pencil proton beam
- 1.0581046 - ÚJF 2025 RIV GB eng J - Journal Article
Majer, M. - Pasaricek, L. - Brkic, H. - Davídková, Marie - Navrátil, M. - Vondráček, V. - Kneževic, Z.
Relative efficiency of radiophotoluminescent glass dosimeters in a scanning pencil proton beam.
Radiation Physics and Chemistry. Roč. 216, MAR (2024), č. článku 111396. ISSN 0969-806X. E-ISSN 1879-0895
EU Projects: European Commission(XE) 730983 - INSPIRE
Institutional support: RVO:61389005
Keywords : Dose response * Relative efficiency * RPL glass dosimeter * TLD-100 * Proton therapy
OECD category: Radiology, nuclear medicine and medical imaging
Impact factor: 2.8, year: 2023
Method of publishing: Limited access
https://doi.org/10.1016/j.radphyschem.2023.111396
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/mu m to 1.7 keV/mu m) 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/mu m. 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.
Permanent Link: https://hdl.handle.net/11104/0349612
Number of the records: 1