Luminescent and dosimetric properties of ultrafine magnesium oxide ceramics after high dose irradiation

摘要

The luminescent and dosimetric properties of ultrafine MgO ceramics synthesized in strongly reducing conditions at T = 1100-1400 degrees C 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. (C) 2015 Elsevier Ltd. All rights reserved.