TL in green tourmaline: Study of the centers responsible for the TL emission by EPR analysis

Cano, Nilo F.; Rao, T.K. Gundu; Ayala-Arenas, Jorge S.; Gonzales-Lorenzo, Carlos D.; Oliveira, Letícia Maria de; Watanabe, Shigueo

doi:10.1016/j.jlumin.2018.09.034

Cited by 12 publications

(3 citation statements)

References 41 publications

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“…HVL values that are directly correlated with photon energy levels will be utilized as an effective shielding resource. The Glass MFP values rose with Ho 2 O 3 concentration, while the YPBH-2.0 glass had the lowest MFP parameter values [27]. The outcomes are caused by density change when Ho 2 O 3 concentration rises.…”

Section: Elastic Lattice and Radiation Protection Abilitymentioning

confidence: 91%

TL defect center analysis and radiation shielding phenomenon In Ho³⁺: Pb(YB)₂O₇ composite glasses

Ashok

Francis

Guntu³

2023

Phys. Scr.

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The goal of the ongoing research was to create resources that were mechanically durable, thermally luminous, and radiation-shielding. In this manner, we intended to synthesize lead borate glasses containing functional groups for yttrium and holmimum. Ho2O3 doped glasses, which are typically used for luminescent purposes, will also be used to investigate the thermoluminescence characteristics under gamma radiation. XRD, SEM, EDX, and DTA techniques are used to examine the samples' structure, chemical analysis, and thermal characteristics. To assess the samples' micro-hardness, the test sample's ultrasonic velocities are measured.The mass attenuation coefficient and order of radiation protection ability are shown by the radiation shielding characteristics of samples. It should be highlighted that Holmium ions alone are responsible for the shielding behaviour. The TL characteristics of the samples were examined at gamma irradiation doses of 5, 10, and 25 kGy. Irradiation increases the TL Intensities that have been observed. The findings show that Ho2O3 is the only factor contributing to the TL phenomenon, and test samples exhibit substantial TL activity. Additionally, samples were examined using the DTA technique for changes in thermal stability. Which also implies that changes in thermal stability are solely dependent on holmium concentration. Overall, the results showed that Y(20-x)Pb10B70:Hox glasses are effective TL materials and strong radiation shielding resources with low thickness values.

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Section: Elastic Lattice and Radiation Protection Abilitymentioning

confidence: 91%

TL defect center analysis and radiation shielding phenomenon In Ho³⁺: Pb(YB)₂O₇ composite glasses

Ashok

Francis

Guntu³

2023

Phys. Scr.

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“…When Cr2O3 is doped in the barium-based lanthanum silicates, it is understood that Cr 3+ can occupy the La 3+ sites and also to the Si 4+ tetrahedral sites. The charge compensated oxygen vacancies are created within the lattice based on the dopant (Cr2O3) concentration [37,38].…”

Section: Correlation -Electron Paramagnetic Resonance and Thermoluminiscencementioning

confidence: 99%

Electron Paramagnetic Resonance, and Thermoluminiscence Mechanism In Radiation Shielding Cr2O3 - Ba(La)2SiO6 Glasses

Guntu¹

2021

Preprint

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The research on Cr2O3 doped SiO2 glasses is well known for advanced dielectrics. However, there are many other valuable properties associated with Cr2O3 inclusive various glasses. In this view, the current research aimed to develop the radiation shielding, elastically rich, and the EPR based Cr2O3 doped Ba(La)2SiO6 glass resource. Electron paramagnetic resonance, radiation shielding, and elastic studies have been employed to investigate the advanced characteristics. Structural characterization suggests glassy behavior with the Cr2O3 undoped glass. Whereas the other involved with Cr2O3 mol% shown with the ceramic behavior. The glass transition phenomena and forming abilities are studied with the help of differential thermal analysis techniques. Elastic studies have been done with the limit on the glasses, which suggests the glasses are flexible for elastic use. The electron paramagnetic resonance reports suggest high order of dipole-dipole super-exchange interaction and rhombohedral distortion within the glasses. Furthermore, we have tested the glasses for radiation shielding properties. The values of mass attenuation coefficient, radiation protection efficiency, mean free path, and energy absorption build-up factor of the glasses are measured and compared with values obtained with the help of standard photon shielding and dosimetry software. The studies indicate that the glasses developed are capable of radiation shielding. Upon 50 kGy, γ - irradiation, the thermoluminescence properties of the glasses are reported. The results found to be interesting, and reveal the resource developed are thermoluminescent at low activation energies. Furthermore, we have tested, the glasses for radiation shielding properties. Moreover, to introduce the detailed correlation between electron paramagnetic resonance, and thermoluminescence phenomenon, we have annealed the glasses under 0 to 300 oC temperature and upon the 0 to 50 kGy, γ - irradiation dose level. The electron paramagnetic resonance and thermoluminescence properties obtained for the glasses are highly correlative.

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“…13 (A-C). In the natural green samples appear two signals are signal at 283 mT, due to Mn content, and signal of Fe content at 357 mT (Cano et al, 2019), are shown in Figure 4.13 (A). When green samples were irradiated at 400 kGy with both techniques (Figure 4.13A and 4.13B), the irradiated samples present broad signals which related to Ocenter at 343 mT and 351 mT.…”

Section: Epr Spectroscopymentioning

confidence: 96%

Color enhancement of tourmaline by electron beam irradiation

Suwanmanee

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Tourmaline is a semi-precious stone that is quite popular in gem market. Red-purple tourmaline, so-called Rubellite, is particularly famous. Consequently, pink tourmalines have recently been enhanced by gamma radiation to intensify color as rubellite. In this study, an electron beam technique was applied for experimental treatment. Moreover, gamma ray irradiation was also applied to treat the same sample collection for comparison. Color enhancement was designed for both radiations at three levels of doses, i.e., 400, 800, and 1,200 kilogreys. Pink and green tourmalines from Nigeria were collected for the experiment. Each sample was cut into two tablets for experimental irradiations using e-beam and gamma ray. Based on chemical compositions, these samples were identified as elbaite. The UV-Vis absorption spectra (300-850 nm) of pink tourmalines showed the maximum absorption band in blue-green range around 515 nm, which was caused by Mn?? yielding pink color. The minor absorption band was also observed in purple range (about 395 nm) causing yellow which related to Mn??. As the results, electron beam irradiation produced more intense pink which absorption bands at 395 and 515 nm were intensified after irradiation. Therefore, e-beam irradiation provides more efficiency for intensification of pink color in tourmaline. Moreover, higher Mn/Fe ratio in sample yielded more intense pink after irradiation. Two color centers, O- center (hole color center) and H? center (electron color center), appeared in pink tourmalines after irradiation . For green tourmalines, yellow shade appeared slightly after both irradiation techniques. The irradiated green tourmalines after both types of radiation presented only O- center signal in EPR spectra. Therefore, it can be assumed that the intense pink color after irradiation is probably related to H? center (electron color center) with involvement of Mn impurity. On the other hand, yellow tonality produced after irradiation is caused by O- center (hole color center).

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TL in green tourmaline: Study of the centers responsible for the TL emission by EPR analysis

Cited by 12 publications

References 41 publications

TL defect center analysis and radiation shielding phenomenon In Ho³⁺: Pb(YB)₂O₇ composite glasses

TL defect center analysis and radiation shielding phenomenon In Ho³⁺: Pb(YB)₂O₇ composite glasses

Electron Paramagnetic Resonance, and Thermoluminiscence Mechanism In Radiation Shielding Cr2O3 - Ba(La)2SiO6 Glasses

Color enhancement of tourmaline by electron beam irradiation

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TL in green tourmaline: Study of the centers responsible for the TL emission by EPR analysis

Cited by 12 publications

References 41 publications

TL defect center analysis and radiation shielding phenomenon In Ho3+: Pb(YB)2O7 composite glasses

TL defect center analysis and radiation shielding phenomenon In Ho3+: Pb(YB)2O7 composite glasses

Electron Paramagnetic Resonance, and Thermoluminiscence Mechanism In Radiation Shielding Cr2O3 - Ba(La)2SiO6 Glasses

Color enhancement of tourmaline by electron beam irradiation

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TL defect center analysis and radiation shielding phenomenon In Ho³⁺: Pb(YB)₂O₇ composite glasses

TL defect center analysis and radiation shielding phenomenon In Ho³⁺: Pb(YB)₂O₇ composite glasses