This paper reports the characterization of two scintillating materials in powder form, Gadox and YVO embedded in a light-activated resin, used in a probe developed for oncological brachytherapy in-vivo dosimetry. The materials were characterized in terms of internal absorption, scintillation decay time, and light yield. The measurement of the optical characteristics highlighted a significant internal absorption at the scintillation light wavelength, with values of 6.5 dB/mm for Gadox and 14.1 dB/mm for YVO. Measurements of the characteristics scintillation time and of the light yield were performed with a novel method based on single photon counting, profiting from the long decay time of the materials under study. Measurements have been complemented by a two-step simulation with Geant4 to study the energy deposition followed by a ZEMAX OpticStudio (R) ray tracing to estimate the light collection effi-ciency. The decay time for scintillating materials were measured to be r?????????????????????????????? = (458 & PLUSMN; 3 & PLUSMN; 3) mu s and rYVO = (451 & PLUSMN; 8 & PLUSMN; 3) irs and the estimated values of the light yield are (7.1 & PLUSMN; 0.5) x 104 photon/MeV for Gadox and (4.8 & PLUSMN; 0.5) x 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 scintillating materials in powder form, Gadox and YVO embedded in a light-activated resin, used in a probe developed for oncological brachytherapy in-vivo dosimetry. The materials were characterized in terms of internal absorption, scintillation decay time, and light yield. The measurement of the optical characteristics highlighted a significant internal absorption at the scintillation light wavelength, with values of 6.5 dB/mm for Gadox and 14.1 dB/mm for YVO. Measurements of the characteristics scintillation time and of the light yield were performed with a novel method based on single photon counting, profiting from the long decay time of the materials under study. Measurements have been complemented by a two-step simulation with Geant4 to study the energy deposition followed by a ZEMAX OpticStudio (R) ray tracing to estimate the light collection effi-ciency. The decay time for scintillating materials were measured to be r?????????????????????????????? = (458 & PLUSMN; 3 & PLUSMN; 3) mu s and rYVO = (451 & PLUSMN; 8 & PLUSMN; 3) irs and the estimated values of the light yield are (7.1 & PLUSMN; 0.5) x 104 photon/MeV for Gadox and (4.8 & PLUSMN; 0.5) x 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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