This paper reports the characterization of two scintillatingmaterials in powder form, Gadox and YVO embedded in a light-activated resin, used in a probe developed for oncological brachytherapy in-vivo dosimetry. Thematerialswere characterized in terms of internal absorption, scintillationdecay time, and lightyield. The measurementof the optical characteristics highlighted a significant internal absorptionat the scintillation light wavelength, with values of 6.5dB/mm for Gadox and 14.1dB/mm for YVO. Measurements of the characteristics scintillation time and of the light yieldwere performedwith a novel method based on single photon counting, profiting from the long decay time of thematerials under study. Measurements have been complemented by a two-step simulation with Geant 4 to study the energy deposition followed by a ZEMAX OpticStudio® ray tracing to estimate the light collection efficiency. The decay time for scintillating materials were measured tobe 𝜏𝐺𝑎𝑑𝑜𝑥 =(458 ±3 ±3) μs and 𝜏𝑌𝑉𝑂=(451 ±8 ±3)𝜇 s and the estimated values of the light yield are(7.1±0.5)×104 photon/MeV for Gadox and (4.8 ±0.5)×104 photon/MeV for YVO.

Characterization of scintillating materials in use for brachytherapy fiber based dosimeters

S. Cometti
;
A. Giaz
;
S. Lomazzi;R. Santoro;M. Caccia;
2022-01-01

Abstract

This paper reports the characterization of two scintillatingmaterials in powder form, Gadox and YVO embedded in a light-activated resin, used in a probe developed for oncological brachytherapy in-vivo dosimetry. Thematerialswere characterized in terms of internal absorption, scintillationdecay time, and lightyield. The measurementof the optical characteristics highlighted a significant internal absorptionat the scintillation light wavelength, with values of 6.5dB/mm for Gadox and 14.1dB/mm for YVO. Measurements of the characteristics scintillation time and of the light yieldwere performedwith a novel method based on single photon counting, profiting from the long decay time of thematerials under study. Measurements have been complemented by a two-step simulation with Geant 4 to study the energy deposition followed by a ZEMAX OpticStudio® ray tracing to estimate the light collection efficiency. The decay time for scintillating materials were measured tobe 𝜏𝐺𝑎𝑑𝑜𝑥 =(458 ±3 ±3) μs and 𝜏𝑌𝑉𝑂=(451 ±8 ±3)𝜇 s and the estimated values of the light yield are(7.1±0.5)×104 photon/MeV for Gadox and (4.8 ±0.5)×104 photon/MeV for YVO.
2022
2022
Brachytherapy Inorganic scintillators Single photoelectron SiPM Light yield
Cometti, S.; Gierej, A.; Giaz, A.; Lomazzi, S.; Baghdasaryan, T.; Van Erps, J.; Berghmans, F.; Santoro, R.; Caccia, M.; O???keeffe, S.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11383/2145428
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