Ultraviolet radiation (UVR) dosimetry system and the use of Ge-doped silica optical fibres

• Published in: Radiation Physics and Chemistry
• Main Author: Abdul Rahman A.T.; Abu Bakar N.K.; Chandra Paul M.; Bradley D.A.
• Format: Article
• Language: English
• Published: Elsevier Ltd 2014
• Online Access: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84905984205&doi=10.1016%2fj.radphyschem.2014.04.002&partnerID=40&md5=9bddf83b108c0af28ffcf3bc212ebd6d

Previous studies have shown that over exposure to ultraviolet radiation (UVR), either from sunlight or artificial sources, can cause severe biological effects including cataracts, photokeratitis and skin cancer. In this respect, there exists the need to introduce a sensitive UV dosimetric material capable of measuring radiation dose to high accuracy in order to deliver UVR safely and efficiently. Present study has focussed on the investigation of the potential thermoluminescent (TL) sensitivity of commercially available germanium (Ge)-doped silica (SiO2) optical fibres subjected to UVR. The main interest of this study is to find out whether these doped SiO2 optical fibres can be used as a sensible integrator of environmental UV exposures. In the present study, commercially available Ge-doped SiO2 optical fibres have been used with a core diameter of 11μm (CorActive, Canada), 23μm (Central Glass and Ceramic Research Institute Kolkata, India) and 50μm (Central Glass and Ceramic Research Institute Kolkata, India) and a cladding diameter of 125±0.1μm, irradiated over a wide range of UV dose. Results have shown that these fibres exhibit a linear dose response (with correlation coefficient better than 0.9852). The 50μm fibre produces greater TL response than that obtained for 11- and 23μm fibres. The TL results are compared with that of the well-established TL dosimeter material lithium fluoride. © 2014 Elsevier Ltd.