Thermoluminescence glow curve study of beta irradiated germanium doped core fibre with different dopant concentrations

• Published in: Radiation physics and chemistry (Oxford, England : 1993) England : 1993), 2022-04, Vol.193, p.109974, Article 109974
• Main Authors: Termsuk, C., Sweeney, S.J., Shenton-Taylor, C.
• Format: Article
• Language: English
• Subjects: Beta rays; Dopants; Doped fibers; Dosimetry; Germanium; Glow curves; Irradiation; Optical fibre; Room temperature; Silicon dioxide; Strontium 90; Thermoluminescence
• ISSN: 0969-806X; 1879-0895
• DOI: 10.1016/j.radphyschem.2022.109974

This paper reports the assessment of commercial Ge-doped fibres as a potential dosimeter. The thermoluminescence response was measured for 4 fibre types: commercial multi-mode germanium doped core fibres at 4% and 6% weight Ge doping; single mode fibre with a 17% Ge and 1% B (GeB) doped core; and undoped silica fibre. The fibres were subjected to beta irradiation (90Sr/90Y), heated from room temperature to 400 °C. The 6% Ge doped fibre exhibited sensitivity of 7.7 ± 0.2 counts⋅mm−1⋅Gy−1⋅μm−2, greater than the 4% Ge-doped and GeB fibres by factors of 9.2 and 1.3 respectively. All the core-doped fibres (Ge, GeB) showed a high linear response across the dose range 1–10 Gy (R2 = 0.99). Increasing the Ge concentration from 4 to 17% lowered the temperature of the glow curve peak from 317 °C to 248 °C. The glow curve for both Ge doped core fibres were analysed using a computerised glow curve deconvolution (CGCD) in TolAnal software. When including Ge dopants, the estimated trap depth for five sub-peaks in the Ge doped fibre was reported between 0.6 and 1.54 eV. •Thermoluminescene response comparison of different Ge dopant concentrations.•Thermoluminescene Glow curve characterisation study of Ge doped fibre.•Trap depth estimation in Ge doped fibre.•Optimum readout temperature for different fibre types for dosimetry.