Characterization of scintillating materials in use for brachytherapy fiber based dosimeters

S. Cometti, Agnieszka Gierej, A Giaz, S. Lomazzi, Tigran Baghdasaryan, Jürgen Van Erps, Francis Berghmans, R. Santoro, M. Caccia, S. O'keeffe

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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.
Original languageEnglish
Article number167083
Pages (from-to)1-7
Number of pages7
JournalNuclear Instruments and Methods in Physics Research Section A
Volume1042
DOIs
Publication statusPublished - 1 Nov 2022

Bibliographical note

Funding Information:
The ORIGIN project is an initiative of the Photonics Public Private Partnership (www.photonics21.org), and has received funding from the European Union's Horizon 2020 Research and Innovation Programme under Grant Agreement n° 871324.

Funding Information:
The ORIGIN project is an initiative of the Photonics Public Private Partnership ( www.photonics21.org ), and has received funding from the European Union’s Horizon 2020 Research and Innovation Programme under Grant Agreement n° 871324 .

Publisher Copyright:
© 2022 The Authors

Copyright:
Copyright 2022 Elsevier B.V., All rights reserved.

Keywords

  • 00-01 99-00 Brachytherapy Inorganic scintillators Single photoelectron SiPM Light yield

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