TY - JOUR
T1 - Characterization of 2D Al2O3:C,Mg radiophotoluminescence films in charged particle beams
AU - De Saint-Hubert, Marijke
AU - Castellano, Fabio
AU - Leblans, Paul
AU - Sterckx, Paul
AU - Kodaira, Satoshi
AU - Swakoń, Jan
AU - de Freitas Nascimento, Luana
N1 - Score=10
PY - 2021/1/21
Y1 - 2021/1/21
N2 - In particle-therapy, 2D dosimetry systems require high spatial resolution and linear dose response as the patient treatment show steep gradients of dose in depth. In this work we report on the characterization of the radiophotoluminescence (RPL) response from Al2O3:C,Mg films exposed to proton (61.3 MeV, 91.5 MeV, 155.5 MeV and 230 MeV) and carbon clinical beams (110 MeV/u). The film response is evaluated in terms of properties particularly important for relative dose measurements, as dose response, film uniformity and minimum detectable dose. The films, based on coatings with average grain sizes of ˜7 µm, demonstrate a better response than those used in our previous studies, with grain sizes of ˜47 µm. Moreover, the Linear Energy Transfer (LET) changes when penetrating through material and it is known that solid-state detectors change luminescence efficiency .HT,. as a function of LET. Therefore, we performed a detailed characterization of our new film to evaluate its response as function of dose and LET. The .HT,. curve, as a function of particle LET, obtained from discrete dose points (slabs) .HT,. is compared with the .HT,. curves from Al2O3:C (OSL) and Al2O3:C,Mg (RPL) films from our previous study. The .HT,. curves are consistent with Birks’ law, where we observe expected quenching for increasing LET. Additionally, we present 2D RPL images, using a wedge phantom, from Al2O3:C,Mg films irradiated with proton and carbon beams, which resulted in a 2D depth dose distribution of the Bragg curve and a comparable LET dependence with the data obtained with the slabs. The results confirm that the images obtained can be advantageously applied to obtain dose distribution in proton and carbon therapy without many corrections.
AB - In particle-therapy, 2D dosimetry systems require high spatial resolution and linear dose response as the patient treatment show steep gradients of dose in depth. In this work we report on the characterization of the radiophotoluminescence (RPL) response from Al2O3:C,Mg films exposed to proton (61.3 MeV, 91.5 MeV, 155.5 MeV and 230 MeV) and carbon clinical beams (110 MeV/u). The film response is evaluated in terms of properties particularly important for relative dose measurements, as dose response, film uniformity and minimum detectable dose. The films, based on coatings with average grain sizes of ˜7 µm, demonstrate a better response than those used in our previous studies, with grain sizes of ˜47 µm. Moreover, the Linear Energy Transfer (LET) changes when penetrating through material and it is known that solid-state detectors change luminescence efficiency .HT,. as a function of LET. Therefore, we performed a detailed characterization of our new film to evaluate its response as function of dose and LET. The .HT,. curve, as a function of particle LET, obtained from discrete dose points (slabs) .HT,. is compared with the .HT,. curves from Al2O3:C (OSL) and Al2O3:C,Mg (RPL) films from our previous study. The .HT,. curves are consistent with Birks’ law, where we observe expected quenching for increasing LET. Additionally, we present 2D RPL images, using a wedge phantom, from Al2O3:C,Mg films irradiated with proton and carbon beams, which resulted in a 2D depth dose distribution of the Bragg curve and a comparable LET dependence with the data obtained with the slabs. The results confirm that the images obtained can be advantageously applied to obtain dose distribution in proton and carbon therapy without many corrections.
KW - Radiophotoluminescence
KW - Hadron therapy
KW - 2D dosimetry
UR - https://ecm.sckcen.be/OTCS/llisapi.dll/open/47625969
U2 - 10.1016/j.radmeas.2021.106518
DO - 10.1016/j.radmeas.2021.106518
M3 - Article
SN - 1350-4487
VL - 141
SP - 1
EP - 10
JO - Radiation Measurements
JF - Radiation Measurements
M1 - 106518
ER -