Optical fiber dosimeter for real-time in-vivo dose monitoring during LDR brachytherapy

An optical fiber sensor for monitoring low dose radiation is presented. The sensor, based on radiation sensitive scintillation material, terbium doped gadolinium oxysulphide (Gd 2 O 2 S:Tb), is embedded in a cavity of 700µm diameter within a 1mm plastic optical fiber. The sensor is compared with the...

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Bibliographic Details
Published in:Biomedical optics express 2020-07, Vol.11 (7), p.4027-4036
Main Authors: Woulfe, P., Sullivan, F. J., Kam, W., O’Keeffe, S.
Format: Article
Language:English
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Summary:An optical fiber sensor for monitoring low dose radiation is presented. The sensor, based on radiation sensitive scintillation material, terbium doped gadolinium oxysulphide (Gd 2 O 2 S:Tb), is embedded in a cavity of 700µm diameter within a 1mm plastic optical fiber. The sensor is compared with the treatment planning system for repeatability, angular dependency, distance and accumulated radiation activity. The sensor demonstrates a high sensitivity of 152 photon counts/Gy with a temporal resolution of 0.1 seconds, with the largest repeatability error of 4.1%, to 0.361mCi of Iodine-125 the radioactive source most commonly used in LDR brachytherapy for treating prostate cancer.
ISSN:2156-7085
2156-7085
DOI:10.1364/BOE.385610