TY - JOUR
T1 - Characterization of scintillating materials in use for brachytherapy fiber based dosimeters
AU - Cometti, S.
AU - Gierej, A.
AU - Giaz, A.
AU - Lomazzi, S.
AU - Baghdasaryan, T.
AU - Van Erps, J.
AU - Berghmans, F.
AU - Santoro, R.
AU - Caccia, M.
AU - O'Keeffe, S.
N1 - Publisher Copyright:
© 2022 The Authors
PY - 2022/11/1
Y1 - 2022/11/1
N2 - 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® ray tracing to estimate the light collection efficiency. The decay time for scintillating materials were measured to be τGadox = (458 ± 3 ± 3) μs and τYVO = (451 ± 8 ± 3) μs 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.
AB - 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® ray tracing to estimate the light collection efficiency. The decay time for scintillating materials were measured to be τGadox = (458 ± 3 ± 3) μs and τYVO = (451 ± 8 ± 3) μs 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.
KW - Brachytherapy
KW - Inorganic scintillators
KW - Light yield
KW - SiPM
KW - Single photoelectron
UR - https://www.scopus.com/pages/publications/85138468385
U2 - 10.1016/j.nima.2022.167083
DO - 10.1016/j.nima.2022.167083
M3 - Article
AN - SCOPUS:85138468385
SN - 0168-9002
VL - 1042
JO - Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
JF - Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
M1 - 167083
ER -