Characterization of scintillating materials in use for brachytherapy fiber based dosimeters

S. Cometti; A. Gierej; A. Giaz; S. Lomazzi; T. Baghdasaryan; J. Van Erps; F. Berghmans; R. Santoro; M. Caccia; S. O'Keeffe

doi:10.1016/j.nima.2022.167083

Characterization of scintillating materials in use for brachytherapy fiber based dosimeters

S. Cometti
, A. Gierej
, A. Giaz
, S. Lomazzi
, T. Baghdasaryan
, J. Van Erps
, F. Berghmans
, R. Santoro
, M. Caccia
, S. O'Keeffe

University of Insubria
Vrije Universiteit Brussel

Research output: Contribution to journal › Article › peer-review

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® ray tracing to estimate the light collection efficiency. The decay time for scintillating materials were measured to be τ_Gadox = (458 ± 3 ± 3) μs and τ_YVO = (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.

Original language	English
Article number	167083
Journal	Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Volume	1042
DOIs	https://doi.org/10.1016/j.nima.2022.167083
Publication status	Published - 1 Nov 2022

Keywords

Brachytherapy
Inorganic scintillators
Light yield
SiPM
Single photoelectron

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10.1016/j.nima.2022.167083

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Cometti, S., Gierej, A., Giaz, A., Lomazzi, S., Baghdasaryan, T., Van Erps, J., Berghmans, F., Santoro, R., Caccia, M., & O'Keeffe, S. (2022). Characterization of scintillating materials in use for brachytherapy fiber based dosimeters. Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 1042, Article 167083. https://doi.org/10.1016/j.nima.2022.167083

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title = "Characterization of scintillating materials in use for brachytherapy fiber based dosimeters",

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{\textregistered} 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.",

keywords = "Brachytherapy, Inorganic scintillators, Light yield, SiPM, Single photoelectron",

author = "S. Cometti and A. Gierej and A. Giaz and S. Lomazzi and T. Baghdasaryan and \{Van Erps\}, J. and F. Berghmans and R. Santoro and M. Caccia and S. O'Keeffe",

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doi = "10.1016/j.nima.2022.167083",

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Cometti, S, Gierej, A, Giaz, A, Lomazzi, S, Baghdasaryan, T, Van Erps, J, Berghmans, F, Santoro, R, Caccia, M & O'Keeffe, S 2022, 'Characterization of scintillating materials in use for brachytherapy fiber based dosimeters', Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, vol. 1042, 167083. https://doi.org/10.1016/j.nima.2022.167083

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.

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 -

Characterization of scintillating materials in use for brachytherapy fiber based dosimeters

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