Citation

Basaif, A. and Oresegun, Adebiyi and Zubair, H.T. and Zin, Hafiz and Choo, Kan Yeep and Ibrahim, S.A. and Moradi, F. and Ghani, Nadzim and Zha, Hao and Zhu, Yinuo and Lewis, E. and Abdul-Rashid, H.A. and Bradley, D.A. (2025) Pulse-resolved real-time dosimetry in FLASH radiotherapy using Ge-doped silica fiber scintillators. Radiation Physics and Chemistry. p. 113197. ISSN 0969-806X

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Abstract

We present a time-resolved evaluation of a Ge-doped silica fiber scintillator under ultra-high dose-rate (FLASH) radiotherapy conditions delivered by a 6 MeV clinical linear accelerator capable of achieving instantaneous dose rates up to 500 kGy/s. This study aimed to assess the scintillator's ability to accurately measure such extreme radiation conditions. While successful signal acquisition was achieved across a range of pulse repetition frequencies (PRFs), saturation effects—including signal plateauing and decay overlap—were observed at PRFs above 200 Hz, leading to baseline elevation and reduced peak resolution. Nevertheless, the dose–response remained approximately linear, with minor degradation in correlation at the highest PRFs. An iterative deconvolution technique mitigated pile-up artifacts and restored signal fidelity. These findings demonstrate both the potential and current limitations of Ge-doped fiber dosimeters for real-time FLASH dosimetry, underscoring the need for correction strategies to ensure accurate dose measurements at ultra-high delivery rates.

Item Type:	Article
Uncontrolled Keywords:	Electron beam radiotherapy, Radioluminescence, Real-time dosimetry, Optical fiber scintillator
Subjects:	Q Science > QC Physics > QC350-467 Optics. Light
Divisions:	Faculty of Engineering and Technology (FET)
Depositing User:	Ms Suzilawati Abu Samah
Date Deposited:	27 Aug 2025 06:21
Last Modified:	27 Aug 2025 06:26
URII:	http://shdl.mmu.edu.my/id/eprint/14479

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