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

Reddy, S. Satyanarayana; Chauhan, Naveen; Nagabhushana, K.R.; Singh, Fouran

doi:10.1016/j.materresbull.2018.04.019

Cited by 17 publications

(4 citation statements)

References 31 publications

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“…Figure 6 describes the deconvolution analysis of TL glow curve of α‐alumina sample (P1) irradiated with dose 50 Gy which indicates that the fitted glow curve consisted mainly of (5) overlapped peaks. The first peak was at T=520±3 K, the maximum peak was the 2 nd one at T=550±2.6 K, the 3 rd at T=460±4.1 K, the 4 th at T=430±2.8 K and the last peak at T=330±3.2K [24] . The number of traps was validated experimentally by using repeated initial rise method (RIR) which gave five values for activation energy (0.947, 0.64, 0.46, 0.5 and 0.54 eV) represented for each trap.…”

Section: Resultsmentioning

confidence: 91%

“…The first peak was at T = 520 � 3 K, the maximum peak was the 2 nd one at T = 550 � 2.6 K, the 3 rd at T = 460 � 4.1 K, the 4 th at T = 430 � 2.8 K and the last peak at T = 330 � 3.2K. [24] The number of traps was validated experimentally by using repeated initial rise method (RIR) which gave five values for activation energy (0.947, 0.64, 0.46, 0.5 and 0.54 eV) represented for each trap. The thermal stability analysis showed that the first peak was the most unstable peak which disappeared through less than 24 hours from irradiation process so to detect this peak the irradiated sample should be read out immediately after irradiation.…”

Section: Kinetic Analysis Of Tl Glow Curvementioning

confidence: 87%

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A Co‐Precipitated α‐Alumina (Al₂O₃) used as a TL‐Micro Dosimeter

Said

Tantawy

El-Faramawy

et al. 2021

Zeitschrift anorg allge chemie

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This study describes the preparation method of alumina (Al 2 O 3 ) as a type of thermoluminescence dosimeter (TLD) to monitor gamma photons (γ-rays) in abroad band of radioactive doses (0.5 : 2000 Gy). Alumina is selected in this study because it has a relatively low cost TL material and can be easily prepared. Aluminum oxide (Al 2 O 3 ) was chemically prepared using two different methods which are the Sol-Gel and Co-precipitation methods. For each method, the produced alumina (Al 2 O 3 ) was divided into 4 groups which was thermally treated at (400, 600, 800, 1100°C) respectively for 6 hours for each group. The crystalline features, morphology and sample composition of the prepared samples were chemically characterized by X-ray diffraction (XRD), Scanning Electron Microscopy (SEM) and Energy Dispersive X-ray (EDX). Al 2 O 3 prepared by the Coprecipitation method which was treated at 1100°C (P4) was found to exhibit the highest gamma ray response compared to other samples. The deconvolution analysis showed that the main TL glow curve consisted of ( 5) overlapped peaks corresponding to number of traps. The linearity of the gamma response for this sample appeared in doses ranging from 1 Gy up to 200 Gy. The minimum detectable dose that can be detected by precipitated-alumina sample (P1) was calculated mathematically to be 3.653 mGy. The fading was found to be 45.6 % after being stored for 45 days at room temperature and approximately 65 % after 90 days. This sample was reproducible according to the repeated TL results for the same sample for 5 times as their values were very close from one other with standard deviation (� σ) 0.96 %. Henceforth, Co-precipitated αalumina can be used as a TL-Micro dosimeter.

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Section: Resultsmentioning

confidence: 91%

Section: Kinetic Analysis Of Tl Glow Curvementioning

confidence: 87%

A Co‐Precipitated α‐Alumina (Al₂O₃) used as a TL‐Micro Dosimeter

Said

Tantawy

El-Faramawy

et al. 2021

Zeitschrift anorg allge chemie

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“…Here we adopted a second-order differential analysis of the experimental TL curve to identify the number of TL peaks associated with the TL curve for deconvolution. [30,31] F I G U R E 3 Photoluminescence emission spectra of Zr 1Àx Ce x O 2 with x = 0.005, 0.01, 0.02, and 0.03 samples recorded under a 290 nm excitation wavelength; the excitation spectrum is given as the inset The second-order derivative result of each TL curve is shown in Figure 3. In this method, the minima of the peaks below the zero floating line in the y-axis represent the glow peak position.…”

Section: Resultsmentioning

confidence: 99%

“…Here we adopted a second‐order differential analysis of the experimental TL curve to identify the number of TL peaks associated with the TL curve for deconvolution. [ 30,31 ] The second‐order derivative result of each TL curve is shown in Figure 3. In this method, the minima of the peaks below the zero floating line in the y‐axis represent the glow peak position.…”

Section: Resultsmentioning

confidence: 99%

Luminescence properties of Ce‐doped ZrO₂ phosphors synthesized by combustion method

et al. 2023

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Zr1−xCexO2 with x = 0.005, 0.01, 0.02, and 0.03 samples were synthesized using a combustion technique. The X‐ray diffraction results revealed that Ce‐doped ZrO2 nanoparticles were in a monoclinic structure up to 1 mol% Ce concentration. The increase in the Ce concentration caused more distortion in the monoclinic structure of zirconia. The samples showed a mixed phase (monoclinic + tetragonal) beyond 1 mol% Ce content. The crystallite size (D) and strain (ε) were calculated from the Williamson–Hall equation. The D decreased from 25 ± 1 to 20 ± 1 nm and ε increased from 0.03 to 0.28% with an increase in Ce concentration. Photoluminescence (PL) spectra of Zr1−xCexO2 showed emission in the blue region under an excitation wavelength of 290 nm. Zr0.995Ce0.005O2 showed the highest PL intensity with an average lifetime of 0.93 μs, and the PL intensity decreased with the increase in the Ce concentration. Thermoluminescence (TL) glow curves of Zr1−xCexO2 were measured after gamma irradiation (500 Gy) with a heating rate of 5 K s−1. The TL curve of Zr0.995Ce0.005O2 showed two prominent peaks at 412 K (peak 1) and 600 K (peak 2). The first TL glow peak was shifted towards a higher temperature at 440 K above 1 mol% Ce concentration. Repetitive TL measurements on the same aliquot exhibited excellent repeatability. Kinetic parameters associated with the TL peaks were calculated using the curve fitting method. Peak 1 followed non‐first‐order kinetics. The value of the activation energy of the 440 K peak was found to be 0.95 ± 0.01 eV for Zr0.99Ce0.01O2. These findings showed that Zr1−xCexO2 might be used in lighting and radiation dosimeter applications.

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Role of Li⁺ ions on the surface morphology and thermoluminescence properties of Y₂O₃:Tm³⁺ nanophosphor

2020

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Y2O3:Tm3+ and Li+ co‐doped Y2O3:Tm3+ nanopowders were synthesized using the solution combustion method for possible application in ultraviolet (UV) light dosimetry. X‐ray diffraction revealed the crystallite sizes to be in the range 21–44 nm and 30–121 nm using the Scherrer equation and the W‐H plot relationship, respectively. Field emission scanning electron microscopy confirmed that, after co‐doping with 4 mol% concentration of Li+, the particles were spherical in nature with an average size of ~30 nm. Fourier transformed infrared spectroscopy results showed bands at wavenumbers of 556, 1499, 1704, 2342, 2358, 2973, 3433, and 3610 cm−1 that corresponded to the stretching and bending vibrations of Y–O, C=O and O–H. Thermoluminescence (TL) glow peaks for Y2O3:Tm3+ nanophosphors observed at 399 and 590 K were attributed to oxygen defects caused using UV irradiation. These oxygen defects firstly resulted in an increased prominent peak TL intensity for up to 270 min of irradiation and then a decrease. This was attributed to the presence of oxygen defect clusters that caused a reduction in recombination centres. The Li+ co‐doped sample showed peaks at 356, 430, and 583 K and its intensity sublinearly increased up to 90 min and then thereafter decreased. The TL trapping parameters were calculated using computerized glow curve deconvolution methods. The Li+ co‐doped sample exhibited less fading and high trap density under the UV radiation.

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

Cited by 17 publications

References 31 publications

A Co‐Precipitated α‐Alumina (Al₂O₃) used as a TL‐Micro Dosimeter

A Co‐Precipitated α‐Alumina (Al₂O₃) used as a TL‐Micro Dosimeter

Luminescence properties of Ce‐doped ZrO₂ phosphors synthesized by combustion method

Role of Li⁺ ions on the surface morphology and thermoluminescence properties of Y₂O₃:Tm³⁺ nanophosphor

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

Cited by 17 publications

References 31 publications

A Co‐Precipitated α‐Alumina (Al2O3) used as a TL‐Micro Dosimeter

A Co‐Precipitated α‐Alumina (Al2O3) used as a TL‐Micro Dosimeter

Luminescence properties of Ce‐doped ZrO2 phosphors synthesized by combustion method

Role of Li+ ions on the surface morphology and thermoluminescence properties of Y2O3:Tm3+ nanophosphor

Contact Info

Product

Resources

About

A Co‐Precipitated α‐Alumina (Al₂O₃) used as a TL‐Micro Dosimeter

A Co‐Precipitated α‐Alumina (Al₂O₃) used as a TL‐Micro Dosimeter

Luminescence properties of Ce‐doped ZrO₂ phosphors synthesized by combustion method

Role of Li⁺ ions on the surface morphology and thermoluminescence properties of Y₂O₃:Tm³⁺ nanophosphor