Synthesis and thermoluminescence characterization of MgB4O7:Gd,Li |
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| Institution: | 1. Radiological Safety Division, Indira Gandhi Center for Atomic Research, Kalpakkam 603102, Tamilnadu, India;2. Materials Physics Division, Indira Gandhi Center for Atomic Research, Kalpakkam 603102, Tamilnadu, India;1. Universidade Federal de Sergipe, Departamento de Física, Av. Marechal Rondon, s/n, 49100-00, São Cristóvão, SE, Brazil;2. Instituto de Pesquisas Energéticas e Nucleares, Comissão Nacional de Energia Nuclear, IPEN/CNEN-SP, Av. Prof. Lineu Prestes 2242, 05508-000, São Paulo, SP, Brazil;1. Çukurova University, Art Sciences Faculty, Physics Department, 01330, Sarıçam Adana, Turkey;2. Celal Bayar University, Faculty of Arts and Sciences, Department of Physics, Manisa, Turkey;3. Physics Department, Jazan University, P.O. Box 114, 45142, Jazan, Saudi Arabia;4. Mersin University, Art Sciences Faculty, Physics Department, Mersin, Turkey;1. Departamento de Física, Universidade Federal de Sergipe, UFS, Av. Marechal Rondon s/n, 49100-000 São Cristovão, Sergipe, Brazil;2. Instituto de Pesquisas Energéticas e Nucleares, Comissão Nacional de Energia Nuclear, IPEN/CNEN-SP, Av. Prof. Lineu Prestes 2242, CEP 05508-000 São Paulo, Brazil;1. Universidade Federal de Sergipe, Departamento de Física, Av. Marechal Rondon, s/n, 49100-00 São Cristóvão-SE, Brazil;2. Corporación Universitaria del Huila, Cl. 8 #32-49, Neiva-Huila, Colombia;3. Intittuto do Câncer do Ceará, Rua Papi Junior, 1222 Fortaleza-CE, Brazil;4. Instituto de Pesquisas Energéticas e Nucleares, Comissão Nacional de Energia Nuclear, IPEN/CNEN-SP, Av. Prof. Lineu Prestes 2242, 05508-000 São Paulo-SP, Brazil;1. Departamento de Física, Universidade Federal de Sergipe, Av. Marechal Rondon, S/N, 49.100-000, São Cristóvão, SE, Brazil;2. Instituto de Pesquisas Energéticas e Nucleares, Comissão Nacional de Energia Nuclear, IPEN/CNEN-SP, Av. Prof. Lineu Prestes 2242, 05508-000, São Paulo, Brazil;3. Yale University School of Medicine, 333 Cedar Street, New Haven, CT 06511, USA;4. Scuola di Ingegneria, Università di Pisa, Largo L. Lazzarino 2, Pisa I-56125, Italy |
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| Abstract: | Magnesium tetraborate (MTB) doped with rare earth elements were synthesized by solid state sintering technique. Among the different rare earth dopants studied in this phosphor, gadolinium doped phosphors resulted in a single intense dosimetric peak at 250 °C and this is the first report in rare earth-doped MgB4O7 with a glow peak above 200 °C Photoluminescence (PL) and thermoluminescence (TL) studies were performed with this phosphor after exposing the powder samples to ionizing radiation. Monovalent dopants, including Na, Li and Ag, were found to increase the TL sensitivity of the MgB4O7:Gd phosphor without a shift in the TL peak temperature. The TL emission spectra showed characteristic emission of the host lattice, which showed an increase on doping with rare earth or monovalent codopants. The TL sensitivity, dose response curve, and post-irradiation storage stability were studied for the possible use of this material in radiation dosimetry applications. The TL parameters, such as the activation energy, the frequency factor, and the order of kinetics were determined for the Gd-doped MgB4O7 phosphor. The phosphor was found to be reusable after a few cycles of irradiation and annealing. The post-irradiation storage stability studies showed that this near tissue-equivalent phosphor, which has a gamma sensitivity five times that of TLD-100, is suitable for medical dosimetry applications. |
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| Keywords: | Magnesium borate Rare earth Solid state diffusion Thermoluminescence Kinetic parameter Reusability |
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