Effects of hydroxyl content in pure silica optical fiber exposed to kGy electron beams


Oresegun, Adebiyi and Hassan Tarif, Md. Zubair and Ghassan, Louay and Abdul Rashid, Hairul Azhar and Hashim, Siti Aiasah and Bradley, D. A. (2021) Effects of hydroxyl content in pure silica optical fiber exposed to kGy electron beams. Radiation Physics and Chemistry, 178. p. 108975. ISSN 0969-806X

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We present a study on the effect of high dose (kGy) electron beams on pure silica corefibers through examiningthe following phenomena within thefibers: radioluminescence (RL), radiation induced attenuation (RIA), andrecovery. The objective is to identify the relevant characteristics of thesefibers having favourable radiationresponse, that can be utilized in the development of dose measurement systems for high dose (kGy) environ-ments. Two types of 20 m long pure silica opticalfiber samples have been used, differing in their concentrationsof hydroxyl (OH) content. Segments of 3.5 m length from eachfiber were wound into coils of radius ~25 cm andexposed to consecutive irradiation doses, in the order of tens of kGy (10 kGy through 70 kGy in individualexposures), leading to a cumulative dose of some 300 kGy. The low-OHfiber showed saturation of response atthe shorter wavelengths of the RL spectrum for doses of 30 kGy and above, resulting from presence of OxygenDefect Centers (ODC). At the longer wavelengths the RL response of the low-OH opticalfibers is observed toincrease with dose, attributed to various bonding structural defects of silica nanoclusters. The saturation effect atshorter wavelengths is less prominent in the high-OH samples, where a monotonic increase is observed up to~60 kGy indicating the formation of radiation induced ODC beyond this point. For cumulative dose of ~70 kGy,the highest RIA losses were registered at 550 nm (12.74 dB/m) for low-OH sample, and at 460 nm (4.75 dB/m)for high-OH sample. The high-OH sample showed much faster recovery post-irradiation, making it more suitablefor repeated usage. Both the RL and RIA phenomena observed herein show the feasibility of pure silica opticalfibers for dose measurement in high dose (kGy) environments up to individual dose of ~70 kGy.

Item Type: Article
Uncontrolled Keywords: Optical fibers, Hydroxyl content, Defect centers, Luminescence, Kilogray, Visible spectrum
Subjects: T Technology > TK Electrical engineering. Electronics Nuclear engineering > TK7800-8360 Electronics > TK8300-8360 Photoelectronic devices (General)
Divisions: Faculty of Engineering (FOE)
Depositing User: Ms Rosnani Abd Wahab
Date Deposited: 20 Dec 2020 18:01
Last Modified: 01 Jul 2021 10:04
URII: http://shdl.mmu.edu.my/id/eprint/7884


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