T.K. Gundu Rao

About T.K. Gundu Rao

T.K. Gundu Rao, With an exceptional h-index of 30 and a recent h-index of 14 (since 2020), a distinguished researcher at Indian Institute of Technology Bombay, specializes in the field of Electron Spin Resonance.

His recent articles reflect a diverse array of research interests and contributions to the field:

Study of the centers responsible for the TL emission by EPR and PL analysis of Eu-doped CaSiO3 phosphors synthesized by the devitrification method

Synthesis, structural, photoluminescence, and EPR analysis of far red emitting Ca3La2W2O12: Mn4+ inorganic phosphor for applications in plant-growth LEDs

Photoluminescence and EPR spectroscopic studies on narrowband ultraviolet-B (NB-UVB) emitting trivalent gadolinium-doped CaAl4O7 material for phototherapy lamps

Synthesis and thermoluminescence of Ce-doped CaF2 phosphor: Study of defect centers responsible for the TL emission by EPR analysis

Preparation and study of the main dosimetric properties by TL of sintered lithium silicate pellets

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

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

Identification of ESR centers and their role in the TL of natural salt from Lluta, Peru

T.K. Gundu Rao Information

University

Indian Institute of Technology Bombay

Position

___

Citations(all)

3033

Citations(since 2020)

910

Cited By

2528

hIndex(all)

30

hIndex(since 2020)

14

i10Index(all)

77

i10Index(since 2020)

28

Email

University Profile Page

Indian Institute of Technology Bombay

T.K. Gundu Rao Skills & Research Interests

Electron Spin Resonance

Top articles of T.K. Gundu Rao

Study of the centers responsible for the TL emission by EPR and PL analysis of Eu-doped CaSiO3 phosphors synthesized by the devitrification method

Authors

Carlos D Gonzales-Lorenzo,TK Gundu Rao,Alberto A Ccollque-Quispe,Jorge Ayala-Arenas,Monise B Gomes,Betzabel N Silva-Carrera,Roseli F Gennari,Valeria S Pachas,F Monzon-Macedo,H Loro,Jose FD Chubaci,Nilo F Cano,René R Rocca,Shigueo Watanabe

Journal

Materials Research Bulletin

Published Date

2024/3/1

CaSiO3 doped at different ppm of Eu were synthesized by the devitrification method. Polycrystals exhibit a prominent high-temperature TL peak that increases in intensity and shifts toward higher temperatures with increasing amounts of dopant. TL emission spectrum of CaSiO3: Eu displays two very broad bands centered at 400 and 440 nm corresponding to the temperatures of 229.5 and 373.5 °C, respectively. PL measurements indicate the presence of Eu2+ and Eu3+ ions. EPR spectrum arises from two defect centers. One of the centers with principal g-values 2.016, 2.0091, and 2.0051 is attributed to O− ion and the center correlates with the TL peak at 236 °C. Center II with an isotropic g-value of 2.0018 is attributed to an F+ center and the center relates to the TL peak at 120 °C. Center III is also tentatively identified as the F+ center which is associated with the TL peak at 365 °C.

Synthesis, structural, photoluminescence, and EPR analysis of far red emitting Ca3La2W2O12: Mn4+ inorganic phosphor for applications in plant-growth LEDs

Authors

Jung-Kul Lee,Amol Nande,Aadil Ahmad Bhat,S Watanabe,TK Gundu Rao,Vijay Singh

Journal

Ceramics International

Published Date

2024/2/19

This study explores the structural and optical properties of Mn4+ doped Ca3La2W2O12 phosphor. It also investigates the incorporation of Mn4+ ions for deep red emission and electron paramagnetic resonance (EPR) analysis. The phosphors were synthesized using the sol-gel method, and their properties were thoroughly examined using a combination of X-ray diffraction (XRD), Fourier transform infrared (FT-IR), photoluminescence (PL), and EPR technique. The XRD analysis provided insights into the phase purity, and constituents of the synthesized samples. Under 345 nm excitation, we observed far red emission at 705 nm, with the highest emission intensity occurring at a concentration of 0.0025 mol of Mn4+ metal ions in the host matrix. Concentration quenching was observed due to dipole-quadrupole interactions. The CIE chromaticity coordinates confirm far red region emission, and the estimated …

Photoluminescence and EPR spectroscopic studies on narrowband ultraviolet-B (NB-UVB) emitting trivalent gadolinium-doped CaAl4O7 material for phototherapy lamps

Authors

Vijay Singh,Jung-Kul Lee,M Seshadri,Aadil Ahmad Bhat,S Watanabe,TK Gundu Rao

Journal

Ceramics International

Published Date

2024/2/1

Using the sol-gel process, a series of Gd3+ doped CaAl4O7 samples were fabricated. Their crystal characteristics, surface morphologies, and spectral characteristics were analyzed using X-ray powder diffraction (XRD), Fourier transform infrared (FTIR), scanning electron microscopy (SEM), and photoluminescence (PL) spectroscopy. XRD analysis reveals that the prepared phosphor exhibits a single monoclinic phase, indicating a well-defined crystal lattice. Under the excitation wavelength of 272 nm, weak and strong emission peaks were identified at 307 nm and 314 nm, which correspond to 6P5/2 → 8S7/2 and 6P7/2 → 8S7/2 transitions, respectively. A strong electron paramagnetic resonance (EPR) signal of the CaAl4O7:Gd3+ phosphor was observed at geff ∼ 2.16 and 1.94 along with several weak EPR signals that were observed at geff ∼ 14.8, 9.7, 5.6, 4.8, 3.7, 3.16, 2.7 and 1.5. The intense narrowband at …

Synthesis and thermoluminescence of Ce-doped CaF2 phosphor: Study of defect centers responsible for the TL emission by EPR analysis

Authors

Joel A Rivera-García,Jessica Mosqueira-Yauri,TK Gundu Rao,Edwar A Canaza-Mamani,Giovanni G Fiorini,JF Benavente,Carlos D Gonzales-Lorenzo,José FD Chubaci,Shigueo Watanabe,Jorge S Ayala-Arenas,Nilo F Cano

Journal

Journal of Luminescence

Published Date

2023/9/1

We present here the thermoluminescence (TL) properties of Ce-doped CaF2 (CaF2:Ce) phosphor synthesized by combustion of the precipitate formed from the addition of NH4F to (Ca(NO3)2)⋅4H2O. The structure analysis of the synthesized sample was carried out by X-ray diffraction (XRD) technique. The CaF2:Ce phosphor shows an intense peak at about 120 °C and a low-intensity peak at 280 °C. Both peaks' thermoluminescence (TL) intensity was observed to increase with γ-dose. The kinetic parameters of TL peaks were calculated for CaF2:Ce phosphor using the Tm-Tstop and deconvolution methods. Electron paramagnetic resonance (EPR) is utilized to identify the defect centers formed in γ-irradiated CaF2:Ce phosphor and also to infer the defect centers involved in the TL process. The presence of two defect centers is inferred and center I has a g-value equal to 2.018 and is identified as an O− ion. The O …

Preparation and study of the main dosimetric properties by TL of sintered lithium silicate pellets

Authors

Nilo F Cano,Sandra C Aynaya-Cahui,Zaida V Vilca,René R Rocca,TK Gundu Rao,Betzabel N Silva Carrera,Alejandro H Lopez-Gonzales,Henry S Javier-Ccallata,Jorge S Ayala-Arenas

Journal

Journal of Luminescence

Published Date

2023/3/1

This work presents the structural characteristics and the dosimetric properties under ionizing radiation of the lithium silicate (LSO) (LSO) phosphor. The structure of the synthesized material was determined by X-ray diffraction (XRD) method and Rietveld refinement method. The dosimetric properties of LSOLSO in the form of pellets were studied by thermoluminescence (TL) under the effect of different doses of γ-irradiation. The phosphor exhibited a TL emission curve with four TL peaks centered at 100, 182, 250 and 290 °C, with a light emission band centered at 385 nm. The TL dose-dependent γ-radiation dose response of the TL peak at 182 °C was linear in the low-dose region, from the order of mGy to 50 Gy. In addition, the phosphor exhibits lower fading, good reproducibility, and sensitivity of the order of commercial TLD-100 dosimeters.

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

Authors

Zaida V Vilca,TK Gundu Rao,René R Rocca,JF Benavente,Joseff R Mejia-Bernal,José FD Chubaci,Betzabel N Silva-Carrera,Jorge S Ayala-Arenas,Nilo F Cano

Journal

Applied Radiation and Isotopes

Published Date

2023/12/1

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 …

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

Authors

Betzabeth J Lopez-Flores,TK Gundu Rao,Klinton V Turpo-Huahuasoncco,Jessica Mosqueira-Yauri,Jorge S Ayala-Arenas,JF Benavente,René R Rocca,Nilo F Cano

Journal

Journal of Luminescence

Published Date

2023/12/1

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 …

Identification of ESR centers and their role in the TL of natural salt from Lluta, Peru

Authors

Darwin J Callo-Escobar,Nilo F Cano,TK Gundu Rao,Carlos D Gonzales-Lorenzo,Klinton V Turpo-Huahuasoncco,Yolanda Pacompia,Monise B Gomes,Jose F Benavente,Jose FD Chubaci,Shigueo Watanabe,Jorge S Ayala-Arenas

Journal

Applied Radiation and Isotopes

Published Date

2022/4/1

In this study, the thermoluminescence (TL) properties of natural NaCl from Lluta, Arequipa-Peru was investigated. The number of peaks and the kinetic parameters associated with the TL glow peaks of NaCl sample after gamma-irradiation were analyzed by initial rise and deconvolution method. Defect centers induced in pure salt by gamma irradiation have been studied by electron spin resonance (ESR) with a view to identify the centers associated with the TL process in the salt. Thermal annealing experiments indicate the presence of three defect centers. Center I characterized by the g-value 2.011 is identified as an O− ion and relates with the dominant TL peak at 220 °C. Center II with a g-value of 2.0058 is attributed to a F center and is found to correlate with the 128 °C TL peak. Center III has of g-value 2.014 and is also assigned to an O− ion.

Thermoluminescence and electron paramagnetic resonance correlation studies in lithium silicate phosphor

Authors

Sandra C Aynaya-Cahui,Nilo F Cano,Alejandro H Lopez-Gonzales,TK Gundu Rao,Monise B Gomes,Rene R Rocca,Jose FD Chubaci,Shigueo Watanabe,Jorge S Ayala-Arenas

Journal

Solid State Sciences

Published Date

2022/1/1

Lithium silicate phosphor, synthesized by the solid-state reaction method, displays three thermoluminescence (TL) peaks at 155 °C, 240 °C and 430 °C. Activation energy, frequency factor and kinetic order associated with the TL peaks have been determined using E-Tstop and glow curve deconvolution (GCD) methods. Electron Paramagnetic Resonance (EPR) studies have been carried out to identify the defect centers induced in the phosphor by gamma irradiation and also to find the centers responsible for the TL process in the system. The observed EPR spectrum arises from a superposition of three defect centers. One of the centers (center I) with a g-value 2.0097 is identified as the O− ion. Center II with an isotropic g-value 2.0002 is assigned to a F+-type center (singly ionized oxygen vacancy). The F+ center is likely to be associated with the TL peak at 156 °C. Center III characterized by a rhombic g-tensor with …

Structural characterization, continuous-wave optically stimulated luminescence, and correlation between thermoluminescence and EPR of Ce-doped Ca2Al2SiO7 phosphor synthesized …

Authors

Nilo F Cano,Amador J Gonsalez-Vasquez,TK Gundu Rao,Klinton V Turpo-Huahuasoncco,Edwar A Canaza-Mamani,Alejandro H Lopez-Gonzales,Henry S Javier-Ccallata,Jorge S Ayala-Arenas,René R Rocca,Noemi B Silva-Carrera,José FD Chubaci,Shigueo Watanabe

Journal

Journal of Physics and Chemistry of Solids

Published Date

2022/11/1

A calcium aluminum silicate (Ca2Al2SiO7) phosphor doped with different concentrations of cerium has been prepared by a solid-state reaction method. From X-ray diffraction (XRD) data and using the Rietveld refinement method, the phase, structure, and average crystalline size have been determined. Luminescence emissions have been investigated by optically stimulated luminescence (OSL) and thermoluminescence (TL) methods. TL studies reveal a broad peak centered at 220 °C with an emission band at 410 nm. The TL intensity of a sample doped with 0.1 mol% Ce proved to be 115 times stronger than that of an undoped sample. Electron paramagnetic resonance (EPR) has been utilized to detect the defect centers responsible for the TL process in Ce-doped Ca2Al2SiO7 phosphor. The observed EPR spectrum results from a superposition of three defect centers. Center I with a g-value of 2.0090 is assigned …

TL and EPR characteristics of SrAl2O4 phosphor prepared by solid‐state reaction method

Authors

Edwar A Canaza-Mamani,Nilo F Cano,Jessica Mosqueira-Yauri,TK Gundu Rao,Sandra C Aynaya-Cahui,Amador J Gonsalez-Vasquez,Monise B Gomes,José FD Chubaci,Shigueo Watanabe,Jorge S Ayala-Arenas

Journal

Journal of Luminescence

Published Date

2022/5/1

SrAl2O4 phosphor was prepared by solid-state reaction method and characterized using X-ray diffraction (XRD), thermoluminescence (TL) and electron paramagnetic resonance (EPR) spectroscopy. TL glow curve of irradiated phosphor shows three peaks at 135, 260 and 350 °C. The order of kinetics of the three TL peaks is second order with an activation energy of 1.05, 1.60 and 1.93 eV, respectively. EPR studies have been carried out to identify the defect centers induced by gamma irradiation and also to identify the defect centers involved in the TL process in SrAl2O4. Two distinct centers contribute to the observed spectrum at room temperature. Center I exhibiting a four-line hyperfine splitting is identified as an O− ion. O− ion is associated with the high temperature TL peaks at 260 and 350 °C. An eight-line spectrum with a g-value of 2.0068 is attributed to a F+ center (singly ionized oxygen vacancy). This center …

Effect of annealing temperature on the structural, thermoluminescent, and optical properties of naturally present salt from Lluta region of Peru

Authors

Carlos D Gonzales-Lorenzo,Darwin J Callo-Escobar,Alberto A Ccollque-Quispe,TK Gundu Rao,FFH Aragón,Juan Carlos Romero Aquino,DG Pacheco-Salazar,Hector Loro,Jose F Benavente,Jessica Mosqueira-Yauri,Henry S Javier-Ccallata,Jorge S Ayala-Arenas,Nilo F Cano

Journal

Optical Materials

Published Date

2022/4/1

The effect of annealing temperature on the structural, thermoluminescence, and optical properties of the thermally treated naturally occurring salt from Lluta were studied. Samples were submitted to different annealing temperatures from 300 to 700 °C for 30 min. X-ray diffraction analysis of all samples was performed. The predominant crystalline phase found in the Lluta salt sample is NaCl, with minor phases (CaSO4 and Na). TL technique has been used to characterize and determine the dosimetric properties. After the thermal annealing process of samples, an increase in the TL response of up to 80 times the TL intensity of the natural sample is observed. A promising dosimetric high-temperature peak was found for the sample with an annealing temperature of 400 °C for 30 min. Besides, activation energy, frequency factor, and peak position have been determined by E-Tstop, Tm-Tstop, and deconvolution methods …

EPR response of anhydrite crystal (CaSO4) for dosimetry of gamma photon beams

Authors

Nilo F Cano,TK Gundu Rao,Jorge S Ayala Arenas,Henry S Javier-Ccallata,Shigueo Watanabe

Journal

Radiation Physics and Chemistry

Published Date

2021/3/1

An anhydrite (CaSO4) natural sample was studied as possible dosimeter for low and high gamma doses using the technique of electron paramagnetic resonance (EPR). EPR spectrum showed signals due to (SO3)-, (SO4)- radicals and O- center. The anhydrite sample was irradiated with gamma rays with low-dose ranges typical for medical therapy (1–20 Gy) up to high-dose of about 70 kGy. The EPR centers due to (SO3)- and (SO4)- exhibited a linear dose response in the dose range from 1 Gy to 500 Gy, whilst the O- center presented a supra-linear dose response in the range of 50 to 5 kGy.

Structural, paramagnetic centres and luminescence investigations of the UV radiation-emitting BaZrO3: Gd3+ perovskite ceramic prepared via sol-gel route

Authors

Vijay Singh,Shigueo Watanabe,TK Gundu Rao,G Lakshminarayana

Journal

Materials Science and Engineering: B

Published Date

2021/2/1

Perovskite-type ceramic materials have been widely studied due to their potential use in such applications as electrical, thermal, optical, and immobilizing host materials in nuclear waste. In this work, Gd 3+-doped BaZrO 3 perovskite samples were prepared by sol-gel method and characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), electron paramagnetic resonance (EPR) spectroscopy, and photoluminescence (PL) analysis. Our XRD analysis confirmed the formation of the sol-gel products, and the SEM data implicated the prepared porous compound as the cause of the gases that evolved during the preparation. Upon excitation at 275 nm, the ceramic material displayed UVB emission at 315 nm (6 P 7/2→ 8 S 7/2). The EPR technique was used to study the undoped and gadolinium-doped perovskite BaZrO 3 ceramics. The lines in the undoped system were caused by two defect centers …

Trivalent gadolinium doped SrZrO3 perovskite ceramic: Sol-gel synthesis, paramagnetic centres, and luminescence studies

Authors

N Singh,In-Won Kim,S Watanabe,TK Gundu Rao,Vijay Singh

Journal

Ceramics International

Published Date

2020/10/1

Abstract Trivalent gadolinium (Gd 3+) doped SrZrO 3 perovskite ceramic has been prepared and their X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), electron paramagnetic resonance (EPR), and photoluminescence (PL) spectra are recorded. The existence of divalent and tetravalent cations in SrZrO 3 along with a trivalent dopant ion provides an opportunity to study the effect of charge compensators on the system properties. The cubic phase is evident from XRD diffraction patterns of the product. The SEM analysis suggests the formation of voids and pores in the ceramics caused by gases those liberated during the process of sintering. The EPR technique has been used to investigate the un-doped and Gd 3+-doped SrZrO 3 ceramics. The un-doped SrZrO 3 shows an axially symmetric EPR line with g∥= 1.94 and g⊥= 1.99, which is attributed to the Zr …

Calculated and experimental response of calcium silicate polycrystalline to high and very-high neutron doses

Authors

Carlos D Gonzales-Lorenzo,Shigueo Watanabe,Tássio A Cavalieri,Nilo F Cano,TK Gundu Rao,Jose FD Chubaci,Lucas S Carmo,Carmen C Bueno

Journal

Radiation Physics and Chemistry

Published Date

2020/7/1

In the scope to the discovery of new detectors for high and very-high gamma and neutron radiation dose (mGy-MGy), synthetic polycrystals of CaSiO3 have been produced by the devitrification method in our laboratory. CaSiO3 polycrystals were irradiated with thermal, epithermal and a small fraction of fast neutrons. In the position of irradiation, the thermal neutron flux is about 83% of the total neutron flux and the thermal neutron fluences range from 5.82 × 1013 to 2.97 × 1016 n/cm2. This thermal neutron reacts with Ca, Si and O through (n,γ) process, all or part of the gamma emitted in this reaction is absorbed by the sample and is responsible for the induction of thermoluminescence (TL). The total energy emitted by the (n,γ) reaction was calculated analytically. Furthermore, Monte Carlo simulations using MCNP5 radiation transport code was carried out to calculate the deposited dose on CaSiO3 by the neutron …

Elucidation of the centers responsible for the TL peaks in the anhydride crystal

Authors

Nilo F Cano,TK Gundu Rao,Betzabel N Silva-Carrera,Sofia PS Cruz,Henry S Javier-Ccallata,Yaan A Bedoya-Barriga,Jorge S Ayala-Arenas,Shigueo Watanabe

Journal

Journal of Luminescence

Published Date

2020/5/1

The mineral anhydride after gamma irradiation displays four thermoluminescence (TL) peaks at 150, 200, 268 and 338 °C. The kinetic parameters, namely activation energy, frequency factor and kinetic order associated with the main TL peaks have been determined using initial rise and glow curve deconvolution (GCD) methods. Defect centers induced in the mineral by gamma irradiation are studied by electron spin resonance (ESR) with a view to identify the centers responsible for the TL process. ESR spectrum at room temperature is observed to be a superposition of at least six defect centers. Center I with principal g-values g|| = 2.011 and g⊥ = 2.012 is identified as (SO4)− radical and the center relates to the TL peak at 200 °C. Centers II, III and IV are characterized by axial g-tensors and all these three centers are assigned to (SO4)− radicals. These centers correlate with the 268 °C TL peak. Center V with an …

Erratum to ‘‘Elucidation of the centers responsible for the TL peaks in the anhydride crystal’’[J. Lumin. 221 (2020) 117082]

Authors

Nilo F Cano,TK Gundu Rao,Betzabel Noemi Silva Carrera,Sofia Petra Steffens Cruz,Henry S Javier-Ccallata,Yaan A Bedoya-Barriga,Jorge S Ayala-Arenas,Shigueo Watanabe

Journal

Journal of Luminescence

Published Date

2020

Erratum to ‘‘Elucidation of the centers responsible for the TL peaks in th Page 1 Journal of Luminescence 223 (2020) 117319 Available online 5 May 2020 0022-2313/© 2020 Elsevier BV All rights reserved. Erratum Erratum to ‘‘Elucidation of the centers responsible for the TL peaks in the anhydride crystal’’ [J. Lumin. 221 (2020) 117082] Nilo F. Canoa,*, TK Gundu Rao b, Betzabel N. Silva-Carrera b, Sofia PS Cruz b, Henry S. Javier-Ccallatac,**, Yaan A. Bedoya-Barriga d,***, Jorge S. Ayala-Arenas e,****, Shigueo Watanabe b,***** a Instituto do Mar, Universidade Federal de Sao Paulo, Rua Doutor Carvalho de Mendonça 144, CEP 11070-100, Santos, SP, Brazil b Instituto de Física, Universidade de Sao Paulo, Rua do Matao, Travessa R 187, CEP 05508-090, Sao Paulo, SP, Brazil c Facultad de Ciencias e Ingeniería, Universidad Tecnologica del Perú (UTP), Av. Tacna y Arica …

Thermoluminescence and defect centers in β-CaSiO3 polycrystal

Authors

Carlos D Gonzales-Lorenzo,TK Gundu Rao,Nilo F Cano,Betzabel N Silva-Carrera,René R Rocca,Edy E Cuevas-Arizaca,Jorge S Ayala-Arenas,Shigueo Watanabe

Journal

Journal of Luminescence

Published Date

2020/1/1

βCaSiO3 polycrystal was synthesized by the devitrification method. The polycrystal exhibits three thermoluminescence (TL) peaks at 124 °C, 250 °C and 306 °C. Electron paramagnetic resonance (EPR) spectroscopy was used to study the defect centers induced in the polycrystal by gamma irradiation and to identify the centers responsible for the TL process. Three defect centers contribute to the observed spectrum at room temperature. Center I with principal g-values 2.0135, 2.0094 and 2.0038 is attributed to O− ion and the center appears to be the recombination center for 124 °C, 147 °C and 306 C TL peaks. Center II exhibiting an isotropic g-value of 2.00025 is identified as an F+-center (singly ionized oxygen vacancy). F+-center is also observed to be a recombination center for several TL peaks. Center III is assigned to a Ti3+ center displaying an orthorhombic g-tensor with principal values g1 = 1.9830 …

Study of thermoluminescence of green quartz pellets for low dose dosimetry

Authors

Edy E Cuevas-Arizaca,Máximo Rondón,René R Rocca,MB Gomes,B Cortez,Carlos D Gonzales-Lorenzo,JH Takara,T Gundu Rao,NF Cano,JFD Chubaci,LL Campos,S Watanabe

Journal

Radiation Physics and Chemistry

Published Date

2020/12/1

Green quartz is usually studied for low dose TL dosimetry of gamma and X radiation. The aim of the present work is the dosimetric characterization of natural green quartz in the dose range of 0.47 mGy up to 1000 mGy of gamma and X radiation. Green quartz pellets were produced by cold pressing green quartz powder. The pellets are very sensitive to gamma and X radiation with main prominent TL peak at 230 °C. The TL sensitivity of MTS-N (LiF:Mg,Ti) and green quartz pellets were also compared. The dose response curve presented linear behavior in the dose range studied. The glow curve was deconvoluted. Kinetic parameters such as trap depth, kinetic order (b) and frequency factor (s) are determined. The TL photon energy dependence was also evaluated.

See List of Professors in T.K. Gundu Rao University(Indian Institute of Technology Bombay)

T.K. Gundu Rao FAQs

What is T.K. Gundu Rao's h-index at Indian Institute of Technology Bombay?

The h-index of T.K. Gundu Rao has been 14 since 2020 and 30 in total.

What are T.K. Gundu Rao's top articles?

The articles with the titles of

Study of the centers responsible for the TL emission by EPR and PL analysis of Eu-doped CaSiO3 phosphors synthesized by the devitrification method

Synthesis, structural, photoluminescence, and EPR analysis of far red emitting Ca3La2W2O12: Mn4+ inorganic phosphor for applications in plant-growth LEDs

Photoluminescence and EPR spectroscopic studies on narrowband ultraviolet-B (NB-UVB) emitting trivalent gadolinium-doped CaAl4O7 material for phototherapy lamps

Synthesis and thermoluminescence of Ce-doped CaF2 phosphor: Study of defect centers responsible for the TL emission by EPR analysis

Preparation and study of the main dosimetric properties by TL of sintered lithium silicate pellets

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

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

Identification of ESR centers and their role in the TL of natural salt from Lluta, Peru

...

are the top articles of T.K. Gundu Rao at Indian Institute of Technology Bombay.

What are T.K. Gundu Rao's research interests?

The research interests of T.K. Gundu Rao are: Electron Spin Resonance

What is T.K. Gundu Rao's total number of citations?

T.K. Gundu Rao has 3,033 citations in total.

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