Gamma irradiated thermoluminescence response of Ge-doped SiO₂ fibre

Over the past decade and more, considerable interest has been shown in the thermoluminescence (TL) properties of silica-based single-mode optical fibres, in particular investigating potential ionising radiation dosimetry applications. Herein, study has been made of TL glow curve, dose response, reproducibility and fading of 6 mol% Ge-doped silica, fabricated in-house and produced in the form of cylindrical fibres. Three different pairings of doped-core and silica cladding diameters were produced: (40, 241) µm, (80, 483) µm and (100, 604) µm. The TL results were compared against that of TLD-100, one of the most sensitive commercially available LiF-based TL media. For all three pairings of diameters, closely similar TL glow curve were obtained, formed of a single peaked structure with a maximum TL yield located between the temperatures 250 and 310 °C. The TL yield of the fibres were linear over the range of doses investigated, from 1 Gy up to 10 Gy, their dose response exceeding that of TLD-100, the samples also being found to be reusable, without evidence of degradation. - Highlights: • Fabricated tailor-made 6 mol% Ge-doped SiO₂ Fibre of different diameters. • The smallest diameter fibre shows the greatest TL response. • TL yield of all fibres show linear response with gamma dose. • All fibres show maximum peak in glow curve between 250–310 °C. • High response tailor-made fibre suitable for use as a TL dosimeter.