Thermoluminescent Materials Research Articles

Thermoluminescence and structural characterization of biochar in the photon doses of 2–20 Gy for dosimetric applications

The present study aims to develop a thermoluminescence (TL) material for dosimeter that might potentially surpass the performance of passive dosimeters that are currently available. The study focuses on the essential TL characteristics of biochar that is rich in carbon. The main thermoluminescence (TL) dosimetric properties of commercially available biochar under exposure to X-ray photon beams from Linac at doses ranging from 2 Gy to 20 Gy have been examined. These properties include dose response, sensitivity, TL glow curve, energy dependency, and fading. It has been demonstrated that the biochar provides an excellent linear response in the dose range under study and sensitive at lower dose. The biochar sample demonstrated great reproducibility, with a standard variation of less than 3%. Furthermore, a fading study was conducted and a minimum rate of fading for ambient light and dark room circumstances was discovered. The dose-dependent microstructural degradation of biochar is confirmed by SEM/EDX analysis. The structural changes caused by the radiation doses are being monitored using Raman spectra and X-ray diffraction (XRD). The kinetic parameters analysis also confirms the structural alteration brought by photon irradiation. As a result, biochar demonstrates the significant potential to be used in dosimetric applications.

TL response of Sm-doped MgO to 60Co gamma radiation

The thermoluminescent (TL) response of MgO doped with different rare earths was investigated. The TL material was synthesized by the solution combustion method and sintered at 1173 K; the obtained powders were prepared in pellet form. Before irradiation, the dosimeters were annealed at 623 K for 30 min to eliminate any TL signal generated during their manufacture. Independent tests were performed doping the MgO with Tm, Dy, Ce and Sm. The highest TL response was found for Sm-doped MgO (MgO:Sm) reaching the highest sensitivity for 0.4 mol% of Sm. For this sample, the TL response showed linearity from 0.001 to 500 Gy of 60Co gamma radiation. The lower detection limit was found to be equal to 1.17 μGy. The sensitivity of the MgO:Sm prepared dosimeter was approximately 10% the sensitivity of the commercial TLD-100. The TL signal fading was found to be 6% after one month. The deconvolution of the glow curve showed a symmetric peak with a general order kinetics, b, centered at 474 K. These results suggest that this new TL material could be a promising detector to use in diverse dosimetry applications.

Effects of trapped charge transitions between localized levels on the optical properties of thermoluminescent materials: A study of fading and thermal quenching

The current theoretical knowledge about thermoluminescence allows its study through numerical simulations, by solving a set of differential equations that describe system properties. These models, based on experimental evidence, have been used to reproduce the phenomenon of fading and thermal quenching suffered by materials used by Radiation Dosimetry Services such as LiF:Mg;Ti, commercially called TLD-100. These studies have been carried out by adding both possible charge transitions between localized and delocalized levels and complex thermoluminescence models that allow charge transitions between localized levels.

Radiophotoluminescence response of LiF:Mg,Ti pellets irradiated with clinical proton beams in the 70–200 MeV energy range

Lithium fluoride doped with Mg and Ti (LiF:Mg,Ti) has been used for several decades as thermoluminescent dosimeter material, but recently also its radiophotoluminescence has been investigated for applications in dosimetry. In this work, LiF:Mg,Ti pellets (TLD-100) were irradiated in a water phantom at CNAO (Pavia, Italy) with therapeutic proton beams at five energies from 70 to 200 MeV in the dose range from 2 to 20 Gy. After irradiation, their visible radiophotoluminescence spectra were measured in controlled conditions and the spectrally-integrated red emission response of radiation-induced color centers has been investigated. The radiophotoluminescence signal, excited by a 445 nm continuous wave laser, was integrated within a 50 nm-wide band around the emission peak of the F2 color centers, located around 670 nm in LiF. The spectrally-integrated signal of the samples irradiated at the energy of 147.7 MeV exhibited a linear dependence with dose. Moreover, this radiophotoluminescence response appears independent from Linear Energy Transfer in the range from 0.8 to 1.6 keV/μm in all the samples irradiated at the dose of 5 Gy. Such independence was found up to 10.3 keV/μm in samples irradiated within two spread out Bragg peaks made of 36 energy components in the entire investigated proton energy range. The radiophotoluminescence response of the TLD-100 pellets was compared to that of nominally-pure LiF crystals irradiated in the same conditions, which show a similar behavior. The results are encouraging for the exploitation of TLD-100 pellets as passive solid-state radiophotoluminescent dosimeters for proton therapy.

The shape of the TLD-300 glow curve as a function of the energy for photons below 30 keV: Application to triboluminescence X-rays from peeling adhesive tape

The thermoluminescent material CaF2(Tm), known as TLD-300 (Harshaw/Bicron), shows a remarkable dependence of its glow curve shape on the quality of the radiation field. The quotient of high-temperature (maximum at about 265 °C) and low-temperature peaks (maximum at about 175 °C) depends strongly on LET (ions) and photon energy. The shape of the glow curve is parameterized by the high-to-low-temperature ratio, HLTR, a decreasing function of photon energy.Our goal has been to investigate the TLD-300 glow curve shape for six photon energies between 6 and 28 keV, and to apply this extended HLTR calibration to determine the effective energy of triboluminescence-generated X-rays (TGXs) produced when peeling adhesive tape in vacuum.For calibration, TLD-300 chips were exposed to X-rays from a W-anode tube (9.7–27.7 keV effective energies), X-rays from a Cu-anode tube (8.0 keV) and a 55Fe radioactive source (5.9 keV). The chips were subjected to an annealing protocol designed to improve the stability of the low-temperature peaks. Doses were low and deconvolution into 7 peaks was performed with custom-made software. For the TGXs investigation, TLD-300 chips and TLD-100 microcubes were exposed inside a vacuum chamber to radiation generated by the peeling of adhesive tape from its own backing. The dosimeters, located at different angular positions with respect to the tape, were covered with a 21-μm thick layer of Mylar (Dupont Tejjin Films) to eliminate stray radiation and block any UV light that may be emitted along with the TGXs. TLD-300 were thermally handled as in calibration, and the HLTR indicated the effective energy. Microcubes were used as monitors of a controlled exposure.The new calibration data confirmed the previous trend and showed consistency with existing HLTR measurements above 30 keV (after correcting by the different annealing procedures). The TGXs TLD-300 glow curves showed the presence of a low-temperature peak below those included in the usual deconvolution. The measured HLTR indicated effective energies close to 7 keV and constant over a wide range of observation angles.The extended calibration validates the use of this technique to evaluate photon energies below the limits investigated previously. For the investigation of TGXs, TLDs have been used as passive dosimeters, offering new possibilities in cases where pileup would be a limiting factor for active solid-state active detectors. The difference in glow curve shapes between the TGXs and the calibration photons offers a tool for further investigation of processes induced by surface electrification.

Neutron-induced thermoluminescence of Dy3+-doped B2O3–Na2O–CaO–P2O5 glasses

Thermoluminescence (TL) materials based on Dy3+-doped B2O3–Na2O–CaO–P2O5 glasses have been developed for neutron detection. After X-ray irradiation, the TL glow peaks were observed at 360 K, and the TL intensities of the 10B- and 11B-enriched samples were similar. After neutron irradiation, a significant difference in the TL intensities was observed between the 10B- and 11B-enriched samples, which indicates that γ-rays and high-energy particles in the 10B (n, α)7Li reaction efficiently induced TL. The TL intensities derived from the 10B (n, α)7Li reaction linearly increased with neutron fluence of 106–1011 neutrons cm−2. Therefore, TL glass materials were successfully developed for neutron detection.

Thermo-luminescent optical fibre sensor for Li-ion cell internal temperature monitoring

The internal temperature of a Li-ion battery is one of the critical parameters for monitoring cell performance, ageing and safety. The development of new sensor technologies to control the internal temperature of cells without compromising performance and safety remains a challenge. It is one of the objectives of the European INSTABAT project in the framework of the Battery2030+ initiative. The objective of this paper is to describe the development of a new optical fibre sensor based on a thermoluminescent material to monitor internal cell temperature. The development of the sensor, its thermal characterisation and its calibration are presented here. This sensor was inserted into a commercial Li-ion cell and its response during cycling at high charge and discharge rates (2C in charge and 4C in discharge) was investigated. The comparison between external and internal temperature measurements shows good agreement. These results demonstrate the ability of this type of sensor to monitor the internal temperature of a Li-ion battery without affecting its performance at high loading.

Versatility of thermoluminescence materials in thermal history sensing: a review

While several devices can monitor temperature, measuring non-volatile thermal history is far more challenging, especially for sensors placed in hazardous settings like fires and explosions. Herein, the utilisation of thermoluminescent microparticles in thermal history sensors is discussed. These transparent dielectric microparticles can store charge carriers for very extended periods due to their wide distribution of trap states. In its most basic form, an Arrhenius expression is strongly temperature-dependent for determining the population of the trap states. When exposed to high temperatures for a brief period, a particle with filled traps will preferentially lose carriers in shallow traps. To ascertain the temperature and timing of the thermal event, this depopulation creates a mark on the particle luminescence. By being exposed to deep ultraviolet, X-ray, beta, or gamma radiation, which fills the traps with charge carriers, particles are prepared many months before a test, if required. No matter if they are embedded in garbage or other inert materials, one or more particles can nevertheless be made to emit light. Laboratory tests using microheaters and high-energy explosives in the field are used to test and analyse the technology. It is demonstrated that a variety of high-explosive conditions may be used to accurately detect temperatures in the 200 ∘ C to 500 ∘ C range using thermoluminescent materials like LiF:Mg,Ti, MgB4O7:Dy,Li, and CaSO4:Ce,Tb. The article will provide the utilisation of different luminescent materials for sensing thermal history and analysing the particle luminescence mechanism through different thermal models for developing improved thermal history sensing technologies. The thermal history reconstruction techniques are also discussed to predict the thermal history. Therefore, the article will pave the way to understanding the luminescent properties of thermoluminescent microparticles for developing state-of-the-art thermal history sensors for measuring non-volatile thermal history and temperature in extreme environments such as fires and explosions.

An experimental work on radiation scattering features of some thermoluminescent dosimetry materials

In this study, albedo parameters are experimentally measured to determine radiation scattering features of some thermoluminescent dosimetry materials (TLD 100, TLD 100h, TLD 200 and TLD 400). In experimental setup, it was used scattering angle of 168°, 59.54 keV gamma rays and HPGe detector. The effective atomic numbers of the investigated materials were determined from the coherent to Compton scattering intensity ratio. Also, the mass attenuation coefficient, the mass energy absorption coefficient and kerma relative to air and ICRU tissue were calculated for the TLD materials. It was observed that TLD 100h is the best tissue equivalent material among other TLD materials and best reflects 59.54 keV gamma rays.

Thermoluminescence studies of Pakistani limestone pellets for X-rays

The quest to identify low-cost thermoluminescence (TL) materials is vital, and the identification and assessment of natural materials suitable for radiation detection is a rapidly growing area of research. In addition to their specific dosimetric characteristics, such materials must be rigid, insoluble, and chemically inert. One such promising low-cost material can be a limestone having vast deposits in Pakistan. The present study reports the TL and dosimetric features of Pakistani limestone pellets and their comparison with TLD-100.The quarried crystalline limestone rock was hand crushed, sieved, and compressed into the standard TLD chip-sized pellets. The TL response, kinetic parameters, batch homogeneity, dose linearity, individual sensitivity correction factor (i.e., elemental correction coefficient ECC), lowest detectable dose limit (LDDL), coefficient of variation (COV), energy dependency, and fading were determined, and compared with TLD-100. For TL analysis, the pellets were exposed to an 8 Gy dose of 250 kVp X-rays. These exhibited complex TL showing four peaks (P1: 90–110 °C, P2: 130–170 °C, P3: 240–280 °C and P4: 320–350 °C). The limestone response was linear in the studied dose range of X-rays (1–10 Gy), unlike the supra-linear behavior of TLD-100. The kinetic parameters (i.e., the frequency factor (f), activation energy (E), and the kinetic order (b)) were estimated through computerized glow curve deconvolution using the general order of kinetics while confirmed by the Tm-Tstop method. The values of E and f were observed in the ranges of 0.85–1.27 eV and 5.98 × 107 to 1.81 × 1013 s−1, respectively. The calculated value of figure-of-merit (FOM) (i.e., 2.37%) showed a good agreement between the experimental and fitted glow curves. The overall variation in the ECCs for TLD-100 and limestone was found within ±4% and ±7%, respectively. The results of the ECC confirmed batch homogeneity. The calculated value of LDDL was ∼1.01 Gy. The investigation found that the maximum variation in normalized intensity and COV was within the tolerance limit of 5%. The limestone pellets showed less sensitivity than TLD-100. Like TLD-100 at high energy, the pellets showed an independent response. In contrast to TLD-100, the limestone pellets showed a higher response dependency for low-energy X-rays.During the fading study, the total TL intensity decreased by 20% within the initial 24 h of irradiation and then sustained stability for the subsequent week. The results of this study indicate that limestone pellets are effective as an X-ray dosimeter for doses between 1 and 10 Gy.

Li9Mg3[PO4]4F3 fluorophosphate as a new thermoluminescent material: Experimental and theoretical study

In this work, radioluminescence (RL), thermoluminescence (TL) and photoluminescence (PL) of fluorophosphate Li9Mg3[PO4]4F3 as a possible dosimetry material are studied for the first time. It was found that the irradiated sample exhibits significant thermoluminescence in the temperature range of 100–300°С with the main peak at 205°С. The RL, PL and TL spectra consist of one broad band centered at 400 nm which was attributed to defects in the structure of Li9Mg3[PO4]4F3. The energy required to excite defects in Li9Mg3[PO4]4F3 determined by UV–vis spectroscopy is 4.4 eV (λ ≈ 280 nm). Additional evidence for intrinsic defects was obtained from the electron paramagnetic resonance (EPR) in Li9Mg3[PO4]4F3. The DFT method was employed to simulate various defects including single and complex, neutral and charged vacancies. The formation energies of vacancies were predicted and their effect on the electronic structure and optical properties was established. These intrinsic defects introduce additional electronic states into the band gap and absorption bands in the visible region, the position and intensity of which strongly depend on the type of defect. Our experimental and theoretical studies reveal that Li9Mg3[PO4]4F3 can be a promising optical matrix suitable for dosimetric applications. As evidence, the main functional characteristics of the new material are given.

Correlation between figure of merit function and deviation in the assessment of kinetic parameters in realistic TLD-100 behavior using fully-connected neural networks

In this study, a realistic model was employed to research the LiF:Mg:Ti behavior (commercially known as TLD-100), a widely employed as thermoluminescent (TL) material in dosimetry services. The research was focused on exploring the association between the Figure of Merit (FOM) function and deviations from the true kinetic parameter values, that were obtained through fitting experimental measures. FOM function is the most used magnitude to measure the quality of a fit achieved between a mathematical model and experimental data. Indeed, FOM function is particularly relevant when the TL glow curve deconvolution method is implemented to obtain the kinetic parameters: Activation Energy E (eV), Frequency Factor s (s−1), value of kinetic order b, Temperature at which the intensity maximum TMax(oC), Intensity Maximum IMax (a.u.) and Distribution Width σ (eV) of every peak. FOM function is subject to degeneracy under certain conditions, this means that different sets of kinetic parameters can lead to similar FOM values. Furthermore, as the obtained kinetic parameters are deemed acceptable when the FOM value is below 5%, then the physical degeneracy is greater than the mathematical ones. This contribution provides a rigorous analysis of how the FOM values can be impacted by deviations between experimental and estimated data of kinetic parameters from the analysis process. This studio was carried out using a mathematical method based on Artificial Intelligence with a high capability to manage a large volume of data. Another advantage of this method is that the analysis to be extended to a wide range of experimental data.

Thermoluminescent properties of Tb3+-doped B2O3–Na2O–CaO–P2O5 glasses for neutron detection

We fabricated Tb3+-doped B2O3–Na2O–CaO–P2O5 glasses using 10B- or 11B-enriched raw materials to develop new thermoluminescent (TL) glass materials for neutron detection. We investigated TL properties of the glass materials after X-ray and thermal neutron irradiation. A TL glow peak was observed at 376 K after X-ray irradiation, and the integrated TL intensities of the 10B- and 11B-enriched glasses were similar. This result indicates that the 10B- and 11B-enriched glasses had similar sensitivities to X-rays. A broad peak was observed in the 350–650 K range for the 10B- and 11B-enriched glasses after neutron irradiation, and the 10B-enriched glass exhibited higher TL intensities than the 11B-enriched glass in the neutron fluence range of 1.0 × 105–1.0 × 1011 neutron cm−2. This result indicates that γ-rays and high-energy particles in the 10B(n, α)7Li reaction efficiently induced thermoluminescence in the 10B-enriched glass. The TL intensity derived from the 10B(n, α)7Li reaction linearly increased with the thermal neutron fluence in the neutron fluence range of 1.0 × 105–1.0 × 1011 neutron cm−2. The 10B- and 11B-enriched glasses exhibited a wider dynamic range and lower minimum detectable neutron fluence than quite a few TL materials for neutron detection. Therefore, TL glass materials for neutron detection were successfully developed.

TL glow curve and kinetic analysis of Na2SiO3:Pr3+ under beta radiation effect

Ionizing radiation dosimetry with thermoluminescence (TL) materials based on silicon or glass can be interesting in its potential use in radiation monitoring as the solution to the constant looking of development of new radiation detectors. In this work, TL characteristics of sodium silicate exposed to beta radiation effects were studied. TL response beta irradiated exhibited a glow curve with two peaks centered at 398 K and 473 K. Samples showed linearity from 0.55 to 13.2 Gy. TL readings after 10 times showed a repeatability with an error of less than 1%. Remain information showed significant losses during the first 24 h, but its information was almost constant after 72 h of storage. The Tmax-Tstop method exhibited three peaks which were mathematically analyzed with a general order deconvolution finding kinetic orders close to the second order for the first peak, meanwhile the kinetic order for the second peak and third peak are close to second order. Finally, the VHR method showed anomalous TL glow curve behavior with an increasing intensity TL as the heating rate increased.

Metal–Organic Framework Based Thermoluminescence Dosimeter

Conventional thermoluminescence (TL) dosimeters, a type of off-line radiation detection device, are made of inorganic materials that usually require high synthesis temperatures (above 600 °C) and exhibit a multiple peak glow curve with an unclear structure–property relationship, posing an urgent need to seek new TL materials. Here, we presented the first case of applying metal–organic frameworks (MOFs) as a new material platform to construct a TL dosimeter. Synthesized at mild conditions (around 100 °C), the MOF-based TL material exhibits a single peak glow curve, high X-ray attenuation efficiency, and excellent dose–response linearity ranging from 0.01 to 10 Gy. The crystalline nature of MOFs associated with unambiguous structural information enables TL mechanism elucidation by theoretical calculations, which indicate that in SCU-300 the stable free radicals responsible for emitting visible light when heated are attributed to the charge transform (CT) from the anionic carboxyl groups to the centrosymmetric benzene ring. Furthermore, micron-sized SCU-300 single crystals were subjected to a point dose monitoring experiment based on a simulated eyeball model, and the measured doses match well (error <4%) with those by Monte Carlo calculations.

Thermoluminescence properties of Dy3+-Doped Li2O–CaO–P2O5 glasses for neutron detection

In this study, we fabricated Dy3+-doped Li2O–CaO–P2O5 glasses using 6Li or nLi (nLi: containing 6Li or 7Li isotopes in natural abundance) to develop a new thermoluminescent material for neutron detection. Their thermoluminescence (TL) properties were investigated using X-ray and thermal neutron irradiation. TL glow peaks were observed at 366 K after X-ray irradiation, and the observed TL intensities of the nLi and 6Li glasses were similar, indicating that these materials have similar sensitivities to X-rays. A TL glow peak was observed at between 373 K and 400 K after neutron irradiation, and the TL intensities of the 6Li glass were significantly higher than those of the nLi glass, indicating that high-energy particles generated in the 6Li (n, α)3H reaction efficiently induced TL. The thermal neutron fluence and TL intensity derived from the 6Li (n, α)3H reaction in the neutron fluence range of 1.0 × 106–1.0 × 1011 neutrons/cm2 showed good linear correlation. These glasses are expected to be applied in TL dosimetry for X-rays, gamma rays, and thermal neutrons.

Thermoluminescent characterization and defect studies of graphite-rich media under high dose neutron exposure

Thermoluminescence (TL) materials have a broad variety of uses in various fields, such as clinical research, individual dosimetry, and environmental dosimetry, amongst others. However, the use of individual neutron dosimetry has been developing more aggressively lately. In this regard, present study establishes a relationship between the neutron dosage and the optical property changes of graphite-rich materials caused by high doses of neutron radiation. This has been done with the intention of developing a novel, graphite-based radiation dosimeter. Herein, the TL yield of commercially graphite-rich materials (i.e. graphite sheet, 2B and HB grade pencils) irradiated by neutron radiation with doses ranging from 250 Gy to 1500 Gy has been investigated. The samples were bombarded with thermal neutrons as well as a negligible amount of gamma rays, from the nuclear reactor TRIGA-II installed at the Bangladesh Atomic Energy Commission. The shape of the glow curves was observed to be independent of the given dosage, with the predominant TL dosimetric peak maintained within the region of 163 °C–168 °C for each sample. By studying the glow curves of the irradiated samples, some of the most well theoretical models and techniques were used to compute the kinetic parameters such as the order of kinetics (b), activation energy (E) or trap depth, frequency factor (s) or escape probability, and trap lifetime (τ). All of the samples were found to have a good linear response over the whole dosage range, with 2B grade of polymer pencil lead graphite (PPLGs) demonstrating a higher level of sensitivity than both HB grade and graphite sheet (GS) samples. Additionally, the level of sensitivity shown by each of them is highest at the lowest dosage that was given, and it decreases as the dose increases. Importantly, the phenomenon of dose-dependent structural modifications and internal annealing of defects has been observed by assessing the area of deconvoluted micro-Raman spectra of graphite-rich materials in high-frequency areas. This trend is consistent with the cyclical pattern reported in the intensity ratio of defect and graphite modes in previously investigated carbon-rich media. Such recurrent occurrences suggest the idea of employing Raman microspectroscopy as a radiation damage study tool for carbonaceous materials. The excellent responses of the key TL properties of the 2B grade pencil demonstrate its usefulness as a passive radiation dosimeter. As a consequence, the findings suggest that graphite-rich materials have the potential to be useful as a low-cost passive radiation dosimeter, with applications in radiotherapy and manufacturing.

Neutron detection properties of thermoluminescent Sr2B2O5:Eu ceramics

Thermoluminescent (TL) ceramic materials have been developed for neutron detection on the basis of Eu-doped Sr2B2O5. A photoluminescence emission band at around 360 nm was observed for Sr2B2O5 doped with Eu at 0.1–0.3 mol% with respect to Sr, and is attributed to 5d–4f transition of Eu2+. The emission band was also observed in the TL spectra. TL glow peaks were observed at 340, 400, and 500 K in the TL glow curves after X-ray irradiation, and Sr2B2O5 doped with Eu at 0.2 mol% exhibited the highest TL intensity. After neutron irradiation, a significant difference in the TL intensities was observed between the ceramics containing enriched 10B and 11B owing to the contribution of 10B(n,α)7Li reaction to the observed TL. The difference in the TL intensities linearly increased with neutron fluence of, at least, 107–1011 neutrons cm−2. Hence, we succeeded in the development of TL materials for neutron detection.

Combustion synthesis of Ba2Ca(BO3)2:Eu2+ phosphors and position of 4f and 5d energy levels of lanthanides in Ba2Ca(BO3)2 host lattice

In this work, Eu2+ doped Ba2Ca(BO3)2 was fabricated by combustion method at various conditions of fuel and annealing temperature. X-ray diffraction (XRD), scanning electron microscope (SEM), photoluminescence (PL) spectra were used to investigate the optimal conditions for preparation of Ba2Ca(BO3)2:Eu2+ phosphors. Eu3+ state in Ba2Ca(BO3)2 host lattice was obtained by annealing the Ba2Ca(BO3)2:Eu2+ at 700 °C in air and its phonon sideband spectrum was analyzed to find phonon energies. Charge transfer energy determined from excitation spectra of Ba2Ca(BO3)2:Eu3+ sample was used to predict energy level of lanthanide (Ln) ions. The vacuum referred binding energy (VRBE) scheme for all lanthanides in the Ba2Ca(BO3)2 host lattice has been constructed and used to discuss the possibility of several Ln3+ ions doped Ba2Ca(BO3)2 as thermoluminescence materials.

Thermoluminescence kinetic parameters of proton-irradiated germanium doped flat-shape optical fibres

Glow curve is a key element in thermoluminescence (TL) studies as it provides on-the-ground understanding on the trapping mechanism inside the crystal lattice and hence stability of the TL material. In the present work, luminescence mechanism of the in-house fabricated germanium doped (Ge-doped) flat-shape silica optical fibres have been investigated following irradiation by 150-MeV proton beams. Results of TL dose-response showed that there is a linear relationship between TL response and proton doses from 1 to 10 Gy, with a coefficient of determination close to one. The structure of glow curve remains unchanged throughout the studied dose range with a maximum glow peak dominated at temperature of within 250–290 °C. A Tmax-Tstop plot reveals not only horizontal regions but also smooth slopes, indicative of the presence of a continuum distribution of glow peaks and trap depth. A computerised glow curve deconvolution analysis of the respective fibre glow-curves demonstrated that they were composed of five strongly overlapping peaks underlying a broad TL spectrum, obtaining figures of merit in the range of 0.56–1.64%. The main physical kinetic parameters (activation energy and frequency factor) of the fitted glow peaks were obtained using GlowFit software. The data suggest that the TL glow peaks of the Ge-doped silica optical fibres obey second-order kinetics.