Germanium-doped optical fiber for real-time radiation dosimetry


Mizanur Rahman, A. K. M. and Hassan Tarif, Md. Zubair and Begum, Mahfuza Sharmila and Abdul Rashid, Hairul Azhar and Yusoff, Zulfadzli and Ung, Ngie Min and Mat Sharif, Khairul A. and Wan Abdullah, Wan Saffiey and Mahdiraji, Ghafour Amouzad and Mohd Amin, Yusoff and Maah, Mohd Jamil and Bradley, David Andrew (2015) Germanium-doped optical fiber for real-time radiation dosimetry. Radiation Physics and Chemistry, 116. ISSN 0969-806X

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Over the past three decades growing demand for individualized in vivo dosimetry and subsequent dose verification has led to the pursuit of newer, novel and economically feasible materials for dosimeters. These materials are to facilitate features such as real-time sensing and fast readouts. In this paper, purposely composed SiO2:Ge optical fiber is presented as a suitable candidate for dosimetry. The optical fiber is meant to take advantage of the RL/OSL technique, providing both online remote monitoring of dose rate, and fast readouts for absorbed dose. A laboratory-assembled OSL reader has been used to acquire the RL/OSL response to LINAC irradiations (6 MV photons). The notable RL characteristics observed include constant level of luminescence for the same dose rate (providing better consistency compared to TLD-500), and linearity of response in the radiotherapy range (1 Gy/min to 6 Gy/min). The OSL curve was found to conform to an exponential decay characteristic (illumination with low LED source). The Ge doping resulted in an effective atomic number, Zeff, of 13.5 (within the bone equivalent range). The SiO2:Ge optical fiber sensor, with efficient coupling, can be a viable solution for in vivo dosimetry, besides a broad range of applications.

Item Type: Article
Uncontrolled Keywords: Radioluminescence, Optically stimulated luminescence, Dosimeter, Optical fiber, Germanium doped silica, Real-time dosimetry
Subjects: T Technology > TA Engineering (General). Civil engineering (General) > TA1501-1820 Applied optics. Photonics
Divisions: Faculty of Engineering (FOE)
Depositing User: Ms Nurul Iqtiani Ahmad
Date Deposited: 08 May 2015 01:36
Last Modified: 02 Feb 2017 08:20


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