Thermoluminescence Emission Spectra Research Articles

Evaluation of TL and OSL signals of MgB4O7:Tm,Li prepared by the solution combustion method

Magnesium tetraborate (MgB4O7) doped with rare-earth elements is recognized for its suitability in thermoluminescence (TL) dosimetry due to its low effective atomic number (Zeff = 8.4) and the potential applications in neutron dosimetry. The study investigates the luminescent (TL and OSL) properties of MgB4O7 doped with thulium (Tm3+) and lithium (Li+). Samples were synthesized using the solution combustion method and TL and OSL responses were evaluated using a spectrometer and an automated OSL/TL reader. The emission lines of Tm3+ are consistent with previous literature, with Li+ enhancing TL and OSL responses. TL emission spectra unveil distinct bands corresponding to [Tm3+]* transitions. The electron paramagnetic resonance (EPR) spectroscopy analysis carried out in unirradiated, irradiated and annealed samples.The results show that the signals corresponding to BO32− and O2− are seen upon irradiation and disappear after annealing at 200 °C, indicating the participation of these centers in the TL process. The results show that the TL response of MgB4O7:Tm,Li is much more sensitive to gamma radiation than MgB4O7:Tm, with a minimum detectable value of 0.084 mGy and a linear response with dose for the range studied, from 0 to 500 mGy, with R2 of 0.998.

Identification of defect centers responsible for thermoluminescence emission in sol-gel synthesized calcium silicate phosphor

The thermoluminescence (TL) of calcium silicate phosphor (CSO) prepared by the sol-gel method and sintered at 1200 °C were investigated. From Tm-Tstop curve, TL emission spectrum and computer deconvolution using electron traps with discrete and continuous distributions, the glow curves were found to be composed of four TL peaks (117, 190, 250 and 275 °C) with a single emission band centered at 370 nm. Electron paramagnetic resonance (EPR) investigation has been carried out to identify the defect centers formed in the CSO phosphor by γ-irradiation and find the centers related to the TL process in the phosphor. At room temperature, three defect centers were observed. The first center, characterized by the principal g-values of 2.014, 2.011, and 2.0080 was assigned to an O− ion. The second center with g-values 2.015, 2.013, and 2.010 is also attributed to an O− ion and is associated with the TL peak at 280 °C. The third center, with an isotropic g-value of 2.0011 was identified as the F+ center (singly ionized oxygen vacancy) and relates to the TL peak at 280 °C.

TL, OSL, EPR, and defect centers in Tb-doped strontium silicate phosphor synthesized by a solid-state reaction method

Strong thermoluminescence (TL) was observed in Tb-doped strontium silicate phosphor prepared by the solid-state reaction method. Two glow peaks are observed at 100 and 190 °C. TL emission spectra indicate three recombination centers. The number of peaks and the kinetic parameters associated with the TL glow peaks of Tb-doped Sr2SiO4 phosphor after gamma irradiation were analyzed by Tm-Tstop and deconvolution methods. A study of defect centers induced by γ-irradiation and identification of defect centers responsible for the observed TL glow peaks has been carried out using the electron paramagnetic resonance (EPR) technique. The observed spectrum at room temperature is a superposition of at least three defect centers. Center I is characterized by an axially symmetric g-tensor with principal values g|| = 2.019, and g⊥ = 2.0013 and is ascribed to a O2− ion. Center II has a rhombic g-tensor with principal values 2.0072, 2.0024, and 1.995 and is assigned to an F+ center (singly ionized oxygen vacancy) and correlates with the 190 °C TL peak. The third center (center III) has an isotropic g-value of 1.991 and is identified as an F+ center.

Thermoluminescence mechanism of microwave combustion synthesized γ-irradiated Al2O3:Tm3+ phosphor

The thermoluminescence (TL) mechanism of γ-irradiated Al2O3:Tm3+ phosphor is presented in this paper. Al2O3:Tm3+ phosphors are synthesized by muffle furnace combustion (MFC) and microwave combustion (MWC). XRD results exhibit the stable alpha phase of Al2O3 and crystallite size is found to be ∼99 and ∼147 nm for MFC and MWC synthesized samples respectively. The optical band gap (Eg) of MFC and MWC synthesized Tm3+-doped materials is found to be 4.27 and 4.31 eV, respectively using DRS. TL glow curves of γ -irradiated Al2O3:Tm3+ phosphor are recorded for the dose ranging from 0.1 to 20 Gy. TL glow curves of γ - irradiated phosphor show a prominent peak at ∼453 K along with a shoulder at ∼500 K. The prominent TL glow peak (455 K) intensity of MWC synthesized Al2O3:Tm3+ is ∼2.56 times higher than MFC synthesized phosphor. The TL emission spectra of 455 K glow peak show emission at 298, 355, 394, 466, 526, and 658 nm corresponding to the 1I6→3H6, 1D2→3H6, 3P2→3H4, 1G4→3H6, 1D2→3H5 and 1D2→3H4 characteristic transitions of Tm3+. TL emission spectrum exhibits Cr3+ (R-lines) and Mn4+ characteristic emission peaks at 453 K along with Tm3+ emission. TL intensity of the MWC synthesized sample's prominent peak at 453 K increases linearly with a dose from 0.1 to 15 Gy and then it increases super-linearly with a dose up to 20 Gy. The kinetic parameters were calculated and the process of ionization of electrons from Tm3+, electron trap in host lattice, and its recombination mechanism is proposed.

Thermoluminescence investigations and kinetic analysis of highly sensitive LiCaAlF6: Eu,Y phosphor for dosimetric applications

The paper presents detailed thermoluminescence characterization and kinetic analysis of highly sensitive and dosimetric grade lithium calcium aluminum fluoride doped with europium and co-doped with yttrium (LiCaAlF6:Eu,Y). It is synthesized by melt processing technique. The thermoluminescence (TL) and optically stimulated luminescence (OSL) correlation was systematically studied. The study reveals that the OSL signal is attributed to the observed TL peaks in this material. Thus, same defects are responsible for TL and OSL in LiCaAlF6:Eu,Y. Further characterization involved measurement of TL emission spectrum, OSL emission spectrum, steady state photoluminescence (PL) spectra, phosphorescence, sensitivity, fading, dose response etc. The TL sensitivity of this phosphor was observed to be ∼5 times and ∼3 times to that of CaSO4:Dy and commercially available Al2O3:C respectively. PL, TL and OSL emission spectra suggest that Eu2+ ion acts as a luminescence center in this material. Minimum measureable dose for the phosphor in TL mode was found to be 0.3 μGy with negligible fading post 10 days of irradiation. The fading of TL signal in this material is similar to the one observed for OSL signal. The thermal stability and hygroscopic nature of LiCaAlF6:Eu, Y were studied using thermogravimetric and differential scanning calorimetry techniques. Owing to the attributes like high sensitivity, wide dynamic dose range it stands as a viable and excellent phosphor material for various radiological and dosimetric applications.

Development of wavelength-resolved 3D-inegrated TL and OSL reader system

A new wavelength-resolved thermo luminescence (TL) cum optically stimulated luminescence (OSL) reader system has been designed and developed. This reader system uses the compact Seya-Namioka optical layout based monochromator, PMT, and resistive heating method to acquire TL glow curve emissions spectrum. The phosphor samples heated from room temperature to 400 °C, either linearly with a programmable heating rate of 0.01 to 30 K s−1 or alternative constant step temperature profiles. The TL glow curve emission spectrum has been resolved by rotating the grating attached to a monochromator covering the wavelength from 200 to 900 nm. The wavelength scanning is linear with respect to time and the scan rate can be selected from 0.1 to 8 n m s−1. A broad spectral response of the PMT detection module has been used to record the emitted TL spectrum. The blue (465 nm) reference LED light source is provided for a spectrum calibration of the monochromator. The isometric 3D TL emission spectra of LiCaAlF6:Eu,Y, α-Al2O3:C, and CaSO4:Dy have been successfully recorded using this reader system. In order to record the OSL emission spectrum, 470 nm blue LEDs have been provided as a separate stimulation module.

Dosimetric properties of Tb-doped LiF/CaF<sub>2</sub> eutectic composite

We have developed a LiF/CaF2:Tb eutectic composite as a novel thermoluminescence (TL) dosimetric material. The LiF/CaF2:Tb eutectic composite was obtained using a melt-solidification method with a lower melting temperature than that of LiF and CaF2. The results of the PL emission and excitation spectra, the X-ray induced radioluminescence decay curve, and the TL emission spectrum indicate that the emissions of LiF/CaF2:Tb eutectic composite are due to 4f-4f transitions of the Tb3+ ion. The integrated TL intensity of the LiF/CaF2:Tb eutectic composite was 3.6 times higher than that of the commercial CaSO4:Tm dosimetric material that is known to show a relatively high TL intensity. The dose response curve of the LiF/CaF2:Tb eutectic composite was measured and the lower detection limit was 0.01 mGy which is the lowest value among the LiF/CaF2 based composites.

Exploring sources of variation in thermoluminescence emissions and anomalous fading in alkali feldspars

Alkali feldspars are routinely used in retrospective dosimetry using luminescence methods. However there is a signal loss over time, termed ‘anomalous fading’, which results in age underestimation if uncorrected. Although significant improvements have been made in recent years, luminescence dating of feldspars remains challenging. This paper investigates the relationships between chemistry, structural state and the scale of exsolution with thermoluminescence (TL) emission spectra and infrared stimulated luminescence (IRSL) fading rates.We measure TL emission spectra, where possible linking the recombination site to physical features of the feldspar crystals. We show that fading rates are lowest in ordered end-member Na- and K-feldspars but significantly greater in disordered end-members, showing that Al–Si order influences fading. As well as having very low fading rates, ordered end-member samples have distinctive TL emission spectra, with the yellow-green emission dominant, while all other samples have a dominant blue emission. Perthites, i.e. exsolved members of the (Na,K)-feldspar solid solution, show greater fading than disordered end-members and fading is greatest in semi-coherent macroperthite. We propose that the state of Al–Si-order, and the occurrence of defects and dislocations at the perthite lamellar interfaces influence anomalous fading rates in feldspars.

TL, OSL and RL emission spectra of RE-doped LiMgPO4 crystals

In this work the spectral properties of emission of differently doped lithium magnesium phosphate (LiMgPO4, LMP) compound were investigated by thermoluminescence (TL), optically stimulated luminescence (OSL) and radio-luminescence (RL) methods. The samples were prepared in the form of crystals, which were grown from the melt by micro-pulling-down technique. Different rare-earth (RE) dopants have been studied regarding the influence on luminescence properties. It was found that the presence of boron ions together with the RE dopant seems to have an impact mainly on the TL emission spectra of the studied LMP crystals. TL, OSL, RL and after-glow emission spectra are comparable for the LMP crystals of the same dopants concentrations. The OSL emission spectra were obtained over a whole available wavelength range by the measurements of the after-glow spectra after the sample stimulation has ended. The obtained results tend to suggest that the investigated RE-doped LMP crystals exhibit promising luminescent properties and could be considered as appropriate candidates for real-time detectors.

Synthesis optimization and charge carrier transfer mechanism in LiLuSiO4:Ce, Tm storage phosphor

LiLuSiO4:Ce and LiLuSiO4:Ce, Tm show very efficient charge carrier storage properties upon beta irradiation after samples have received treatment in vacuum. They outperform the commercial storage phosphor BaFBr(I):Eu2+ in many aspects. The influence of the synthesis conditions, Ce and Tm concentration, nonstoichiometry and codoping with Ca, Hf, Al and Ge are reported. Based on the results of the synthesis optimization, thermoluminescence (TL) emission and TL excitation spectra a mechanism of charge carrier transfer, storage, and recombination during irradiation and thermal or optical readout is proposed.

Synthesis, characterization, mechano-luminescence, thermoluminescence, and antibacterial properties of SrMgAl10O17:Eu phosphor

In this work, the SrMgAl10O17:Eu2+, efficient nanophosphors were prepared using combustion route by employing urea as a fuel. The crystallite sizes of the synthesized phosphor were found in the order of ∼15 nm–90 nm by the Hall-Williamson equation. The surface area of the phosphor was found ∼35.9 m2/g. The ML (Mechano-luminescence) and TL (Thermo-luminescence) properties were used for comparison between traditional and modified urea fuel combustion reaction (MUFC). The great enhancement of ML intensity was found ∼70%, and TL intensity was found ∼123%, as compared to that of the phosphor prepared by the traditional combustion route. The ML and TL emission spectra have been observed in the blue visible region at ∼470 nm. Therefore, this phosphor may be useful in PDP as a blue light emitting phosphor, ML damage sensor, and TL dosimeter for low-dose UV radiation. Long persistence phenomena of the phosphor were discussed using TL decay properties. Combustion derived products SrMgAl10O17:Eu may behave just like Eco-materials. Because micro particles of SrMgAl10O17:Eu does not shows antimicrobial activity, But very less nanoparticle of SrMgAl10O17:Eu (E50 sample) show antimicrobial activity, therefore, E50 phosphor sample may be useful in Food preservation, safe cosmetics, medical devices, and water treatment etc.

Luminescent properties of MgB4O7:Ce,Li to be applied in radiation dosimetry

MgB4O7 is a promising matrix host for use in radiation dosimetry due to its low effective atomic number (Zeff = 8.2). The present work aims to investigate dosimetric and luminescent properties of the MgB4O7:Ce0,5%,Li0.5%, produced through solid-state synthesis, using the optically stimulated luminescence (OSL) technique. The first part of this work discusses the luminescent aspects of this phosphor, such as thermoluminescent emission spectra, photoluminescence emission, lifetime of emission centers and the effect of different lithium concentrations as co-dopant. In the second part, the basic OSL properties were evaluated, including dose-response curve, minimum detectable dose (MDD), step annealing, and best bleaching set-up for reuse of MgB4O7:Ce0,5%Li0.5% composites. The photoluminescence and thermoluminescence emission spectra of the composites present an emission peak at UV-VIS range centered around 370 nm, which is the most suitable for OSL dosimetry; this emission is related to Ce3+ electronic transitions and has a luminescence center lifetime of 0.003 ms. From the step-annealing analyses, it can be seen that the OSL emission is related to different depth trap centers in the band gap. The OSL dose-response curve is linear from 0.1 Gy to 100 Gy, with a MDD around 1 mGy. These properties make this material a strong candidate for different applications in radiation dosimetry field.

Thermoluminescence and persistent luminescence of Tb3+ activated CaYAl3O7

Persistent emission (more than 1.5 h) was observed in Tb3+-doped CaYAl3O7 (CYAM) samples after X-ray or UVC excitation. Thermoluminescent (TL) emission spectra showed that Tb3+ emission is responsible for the TL emission signal, indicating a mechanism with a single recombination and luminescence centre. The shape of TL peaks showed overlap of peaks, and thus more than one trapping centre, and this result was confirmed through Tm x TSTOP analysis. TL measurements as function of doses revealed that the TL peak positions do not change with increasing doses of UVC irradiation, which means that all TL peaks can be well described by first-order kinetics. The initial rise method was used to determine the activation energies, whereas E (eV) x Tstop plot showed a distribution of activation energy ranging from 1.1 to 1.3 eV. These depth traps were assigned to intrinsic defects in the host. Possible mechanisms were discussed considering the 4f ground state of Tb3+ and oxygen vacancies as recombination and trapping centres, respectively.

VUV excited luminescence and thermoluminescence investigation on Er3+- or Pr3+-doped BaY2F8 single crystals

Photoluminescence (PL), thermoluminescence (TL) emission spectra and TL glow curves of barium yttrium fluoride (BaY2F8 – BaYF), undoped and doped with erbium (Er3+) or praseodymium (Pr3+) were measured to investigate the fundamental absorption (band gap – Eg), the nature of the trapping centers, as well as the electronic transitions of Ln3+ in BaYF host. The band gap energy Eg of BaY2F8 was determined by vacuum ultraviolet (VUV) excitation measurements to be around 11.2 eV. Additionally, the electronic transition from excited states of Ln3+ ions and the exciton state were also identified. TL emission spectra showed that the TL emission of doped samples is related to the Ln3+ ion, indicating that the related host trapping centers are not affected by the new trapping centers originated due the dopant ions. Trap depths were calculated by fitting the glow curves using a first order kinetics model. Host-related trapping centers were attributed to intrinsic defects such as Vk and F centers and the new TL peaks observed for Er and Pr-doped samples was associated to the electrons trapping centers. These results lead us to propose a simple model to explain the origin of the TL emission in BaYF.

Luminescence characteristics of silver and rare earth co-doped KCl single crystals grown from melt using Czochralski technique

Single crystals of KCl:Ag, KCl:Ag,Eu and KCl:Ag,Ce were grown from melt using Czochralski technique and investigated for thermally (TSL) and optically stimulated luminescence characteristics (OSL) with main focus on dosimetric applications. The XRD of crystals showed good crystalline nature with a face centered cubic KCl structure. SEM and EDAX analysis confirmed the distribution of dopants in the host lattice. Thermo luminescence (TL) emission of KCl:Ag after irradiating with 60Co gamma rays showed two TL glow peaks around 100 °C and 150 °C. An enhanced TL intensity of 3.5 times and OSL intensity of 1.5 times were observed by co-doping KCl:Ag with Ce. The result is further confirmed by taking photoluminescence and TL emission spectra of the samples. This increased TL and OSL response for KCl:Ag,Ce crystal is attributed to the formation of Vk centers formed due to the doping of Ag in KCl and the F center formed by Ce2+ on irradiation. Dose response of KCl:Ag,Ce showed linearity up to 6 Gy indicating its use in the personal dosimetry applications.

Thermoluminescence of AMOLED substrate glasses in recent mobile phones for retrospective dosimetry

Forty mobile phones using active-matrix organic light-emitting diode (AMOLED) display glasses were tested as emergency dosimeters. The target material was a substrate glass for AMOLED layers located under a cover glass. The measured thermoluminescence (TL) emission spectra and glow curves showed that the glasses are all included in category A and B of a previous study, and the ratio between category A and B was about 8 to 2 for all measured samples. A pre-bleach was applied for 500 s, and TL signals were acquired by measuring the whole wavelength region by removing a UV filter (U-340). This was possible in the same measurement sequence by modifying the Risø TL/OSL DA-20 reader in such a way, that the LED module, used for pre-bleaching, is separated from the detector unit, used for the TL measurement. The signal increase after removing the filter was approximately 50 and 90 times for category A and B, respectively. The zero dose distribution with an average of 34 mGy and a minimal detectable dose (3σ) of 90 mGy was recorded for the forty mobile phones. The position distribution of zero doses across the entire substrate glass of a phone showed a standard deviation of more than 60% for three phone samples. Linear dose response from 30 mGy to 10 Gy was observed, and fading data of the TL signal from glass samples of 22 mobile phones assessed, for up to twenty days after irradiation.

Lanthanide-doped MgO: A case study on how to design new phosphors for dosimetry with tailored luminescent properties

In this work we systematically investigated undoped and lanthanide(Ln)-doped MgO with diverse dopant combinations, MgO:Ce,Ln and MgO:Tb,Ln, where Ln=Eu, Yb, Tm, Sm, Dy, Nd, as well as the same combinations with an additional 3 mol% Li dopant. We characterized the thermoluminescence (TL), optically stimulated luminescence (OSL), radioluminescence (RL), TL emission spectra and OSL emission spectra. Our investigation indicates that Ce3+ and Tb3+ act as recombination centers and their characteristic spectra are observed under thermal or optical stimulation. Conversely, TL measurements suggests that Sm3+, Tm3+ and Yb3+ probably act as electrons traps. The role of Li was investigated, since it was found to increase the RL, TL and OSL intensities in MgO. As part of the present investigation, we identified promising OSL materials sensitive to ionizing irradiation with distinct luminescent properties.

Spectroscopic studies of strong red emitting Sr2SiO4:Eu3+ nanophosphors with high color purity for application in WLED using Judd-Ofelt theory and TL glow curve analysis

Un-doped and Eu3+ doped Sr2SiO4 nanophosphors were synthesized by self-propagating solution combustion synthesis and are characterised with different material and optical characterisations. X-ray diffraction (XRD) confirmed orthorhombic phase, transmission electron microscopy (TEM) revealed the nanophosphors with irregular shape but crystalline in nature. The photoluminescence (PL) excitation, emission spectra and lifetime are thoroughly discussed. The emission spectra due to the excitation under 393 nm showed better asymmetric ratios than the 260 nm excitation ensuring better color purity of 97%. The comparative investigations using commission international del’Eclirage (CIE) diagram also established that the color purity of 393 nm excitation is superior with CIE co-ordinates (0.66, 0.34) and is close to NTSC standards. The Judd Ofelt (JO) intensity parameters (Ω2andΩ4) were obtained from PL emission spectrum and the JO parameters followed the trend Ω2>Ω4 for all Eu3+ concentration. Asymmetric ratios and JO analysis both indicated that the crystal field is non-centrosymmetric in nature. The radiative properties such as branching ratios, emission cross section, optical gain and gain bandwidth of optimised concentration are calculated. Photoluminescence lifetimes exhibited bi-exponential nature and showed higher lifetime for 393 nm excitation. Furthermore, the quenching due to non radiative energy transfer mechanism is dominated by multipole-multipole interaction. All these optical characterisations supported the fact that the nanophosphors excited at 393 nm have better pertinence towards display, laser and lighting application. Thermoluminescence (TL) studies of the nanophosphors were carried out. The kinetic parameters are calculated using general order kinetics and are verified by computerised glow curve de-convolution (CGCD). TL emission spectra and contour plots were analysed that further confirmed that the emission resembled the same as PL emission spectra.

Dosimetric properties of ZrO2 and ZrO2:Sm3+ exposed to beta rays

This work investigates thermoluminescence (TL) and optically stimulated luminescence (OSL) properties of ZrO2 and ZrO2:Sm3+ (1 mol%) synthesized by solution combustion method. XRD measurement suggested that both the samples exhibit monoclinic phase. The average crystallite size measured using scanning electron microscopy is found to be ~ 60 nm. TL glow curve of ZrO2 had a prominent peak at 429 K and a less prominent (or smaller) peak at 510 K. On the other hand, ZrO2:Sm3+ had a broad glow peak at 460 K. TL glow curve intensity of all the peaks is found to increase linearly with beta dose (upto 16.4 Gy) for both samples. TL Trapping parameter are analyzed after deconvolution of TL glow curves using CCDA method. The recombination sites of glow peaks are investigated through TL emission spectrum. The 429 K peak show a band at 500 nm is attributed due to oxygen vacancies. Continuous Wave–OSL measurements (CW-OSL) suggests a linear increase in the intensity with beta dose for both samples. The decay curves are deconvoluted by using general order kinetics. CW–OSL decay curve has shown two components contributing to the OSL signal. The photoionization cross sections of ZrO2 and ZrO2:Sm3+ for two components are found to be 1.187 × 10−16, 6.255 × 10−18 and 1.303 × 10−16, 8.842 × 10−18 cm2 respectively. Linearly Modulated - OSL (LM-OSL) of ZrO2 exhibit broad peak and it is deconvoluted into 4 peaks. These results suggests the possibility of choosing suitable activator for development of new TL dosimeters.

TL/OSL properties of beta irradiated Al2O3:Tm3+ phosphor synthesized by microwave combustion method

This work discusses synthesis of stable α-phase of Al2O3:Tm3+ by combustion method using temperature controlled microwave oven. The crystalline phase was analyzed by X-ray diffraction (XRD) technique and average crystallite size was found to be 147 nm. Observations using scanning electron microscope (SEM) image suggest formation of agglomerated particles and energy dispersive x-ray spectroscopy (EDS) confirmed the incorporation of Tm3+ in Al2O3. Thermoluminescence emission (TLE) spectrum of γ – irradiated Al2O3:Tm3+ shows characteristic emissions of Tm3+, Cr3+ and Mn4+. TL glow curves of γ – irradiated Al2O3:Tm3+ exhibit a prominent peak at 453 K along with a shoulder at 496 K. The glow curves of β – irradiated Al2O3:Tm3+ were studied in different emission regions using U340 + BG39 (UV band pass), CS759 + BG39 (Blue band pass) and BG39 (Visible band pass) optical glass filters. A prominent peak was observed at 471 K in for all mentioned emission regions and an additional shoulder was observed at 511 K with CS759 + BG39 and BG39 filters. TL glow curve of β – irradiated Al2O3:Tm3+ using only BG39 filter had more counts than CS759 + BG39 and U340 + BG39 filters. Further, the effect of Tm3+ impurity on TL response was studied. TL kinetic parameters were estimated by using computerized glow curve deconvolution (CGCD) technique. The activation energy and frequency factor of prominent peak (471 K) were found to be 1.31 eV and 3.50 × 1013 s−1 respectively. Optically stimulated luminescence (OSL) characteristics of β – irradiated Al2O3:Tm3+ were studied using U340 + BG39 and CS759 + BG39 filters. Highest OSL intensity was observed in UV. OSL curves were deconvoluted by general order decay equation. Life time and photoionization cross section of the traps responsible for OSL were found to be 5.30 s and 3.98 × 10−18 cm2 respectively. The process of ionization of electron from Tm3+, electron trap in host lattice and its recombination mechanism is proposed. Phosphorescence decay of beta irradiated sample was also studied. The lifetime of phosphorescence decay was found to be 140 s for the prominent peak and TL intensity decays 25% after the phosphorescence. TL/OSL dosimetric properties viz. linearity with dose, reusability and minimum detectable dose of the phosphor were characterized for medical dosimetry application.