A new method to predict the response of thermoluminescent detectors exposed at different positions within a clinical proton beam

• Published in: Radiation measurements Vol. 133; p. 106281
• Main Authors: Parisi, Alessio, Olko, Pawel, Swakoń, Jan, Horwacik, Tomasz, Jabłoński, Hubert, Malinowski, Leszek, Nowak, Tomasz, Struelens, Lara, Vanhavere, Filip
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.04.2020
• Subjects: Microdosimetric d(z) model; Proton therapy; Thermoluminescent detectors; Microdosimetric d(z) model; Thermoluminescent detectors; Proton therapy
• ISSN: 1350-4487; 1879-0925
• DOI: 10.1016/j.radmeas.2020.106281

The proton depth dose profile measured by luminescent detectors differs from the one measured with reference dosimeters (i.e. ionization chambers) because of several effects including efficiency quenching and changes in the attenuation of the emitted light in case of partial detector irradiation. Using the Microdosimetric d(z) Model in combination with the Monte Carlo radiation transport code PHITS, a methodology was developed to tackle all these factors and calculate the response of luminescent when exposed at different positions along a proton Bragg peak. The results were compared against experimental data gathered with 7LiF:Mg,Ti (MTS-7) and 7LiF:Mg,Cu,P (MCP-7) thermoluminescent detectors, showing a very good agreement (average relative deviation ~ 3% for both detector types, smaller than the combined experimental uncertainty). •The Microdosimetric d(z) Model was coupled with nanoscale simulations using PHITS.•The response of luminescent detectors was predicted along a clinical proton Bragg peak.•A very good agreement with experimental data was found.•The Microdosimetric d(z) Model can be reliably used for calculations in mixed fields.