Development of tailor-made silica fibres for TL dosimetry


Abdul Rashid, Hairul Azhar (2014) Development of tailor-made silica fibres for TL dosimetry. Radiation Physics and Chemistry, 104. pp. 3-9. ISSN 0969-806X

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The Ge dopant in commercially available silica optical fibres gives rise to appreciable thermoluminscence (TL), weight-for-weight offering sensitivity to MV x-rays several times that of the LiF dosimeter TLD100. The response of these fibres to UV radiation, X-rays, electrons, protons, neutrons and alpha particles, with doses from a fraction of 1 Gy up to 10 kGy, have stimulated further investigation of the magnitude of the TL signal for intrinsic and doped SiO2 fibres. We represent a consortium effort between Malaysian partners and the University of Surrey, aimed at production of silica fibres with specific TL dosimetry applications, utilising modified chemical vapour deposition (MCVD) doped silica-glass production and fibre-pulling facilities. The work is informed by defect and dopant concentration and various production dependencies including pulling parameters such as temperature, speed and tension, the fibres also providing for spatial resolutions down to<10 µm, confronting the many limitations faced in use of conventional (TL) dosimetry. Early results are shown for high spatial resolution (∼ 0.1 mm) single-core Ge-doped TL sensors, suited to radiotherapy applications. Preliminary results are also shown for undoped flat optical fibres of mm dimensions and Ge-B doped flat optical fibres of sub-mm dimensions, with potential for measurement of doses in medical diagnostic applications.

Item Type: Article
Subjects: Q Science > Q Science (General)
Divisions: Faculty of Engineering (FOE)
Depositing User: Ms Suzilawati Abu Samah
Date Deposited: 05 May 2014 04:13
Last Modified: 21 Apr 2015 03:03


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