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Luminescent and dosimetric properties of ultrafine magnesium oxide ceramics after high dose irradiation
Institution:1. Department of Physics, Faculty of Science, Universiti Teknologi Malaysia, 81310 UTM Skudai, Johor, Malaysia;2. Radiation Protection Directorate, Energy and Minerals Regulatory Commission, Amman 11183, Jordan;3. Department of Medical Radiography, Al-Azhar University, Gaza Strip, Palestine;4. Centre for Nuclear & Radiation Physics, Department of Physics, University of Surrey, Guildford GU2 7XH, UK;5. Department of Physics, Faculty of Science, University of Malaya, 50603 Kuala Lumpur, Malaysia;6. FRG Biomedical Engineering, Universiti Putra Malaysia, 43400 Serdang, Selangor, Malaysia;7. Department of Physics, Faculty of Science, Universiti Putra Malaysia, 43400 UPM Serdang, Selangor, Malaysia;8. Department of Radiological Sciences, Applied Medical Sciences College, King Saud University, P.O. Box 10219, Riyadh 11433, Saudi Arabia;1. Ural Federal University, Ekaterinburg, Russia;2. Institute of Solid State Chemistry, Ural Branch, Russian Academy of Sciences, Ekaterinburg, Russia;1. Departamento de Investigación en Polímeros y Materiales, Universidad de Sonora, Hermosillo, Sonora 83000, México;2. Departamento de Investigación en Física, Universidad de Sonora, Hermosillo, Sonora 83000, México
Abstract:The luminescent and dosimetric properties of ultrafine MgO ≿eramics synthesized in strongly reducing conditions at Т = 1100–1400 °С are investigated. The growth of photo- and cathodoluminescence output at 2.0–3.5 eV (400–600 nm) is found. It is due to an increase in concentration of single oxygen vacancies and their aggregates. It was established that thermal treatment leads to TL intensity growth after high dose irradiation of the samples by a pulsed electron beam (130 keV). The tunneling mechanism of charge carriers' recombination occurs after this treatment as well. The presence of tunneling recombination is proved by the analysis of the shape and temperature dependence of TL isothermal decay curves. The possibility of using synthesized ceramics for high dose TL dosimetry of ionizing radiations is shown.
Keywords:Magnesium oxide  Oxygen vacancies  Tunneling recombination  Pulse electron beam  High-dose dosimetry
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