Journal
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS
Volume 541, Issue -, Pages 19-25Publisher
ELSEVIER
DOI: 10.1016/j.nimb.2023.05.025
Keywords
Nanophosphors; Order of kinetics; Gamma radiation; Thermoluminescence; X-ray dosimetry; Low dose
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The TL properties of BaSO4: Eu nanophosphors were studied after irradiation with low dose γ- and X-rays. The highest radiation sensitivity was observed for an Eu concentration of 0.5 mol%. The optimized BaSO4: Eu displayed a major TL peak at around 220°C and showed a linear response with absorbed dose.
Thermoluminescence (TL) dosimetry is used in radiation protection and for measuring absorbed dose to patients in diagnostic radiology and radiotherapy. The main aim of the study herein was to assess the TL properties of BaSO4: Eu nanophosphors following irradiation with low dose & gamma;- and X-rays. BaSO4 phosphors activated with various concentrations of Eu were prepared by the co-precipitation method. The highest radiation sensitivity was obtained for an Eu concentration of 0.5 mol%. The TL properties in terms of glow curve, heating rate, reusability, fading and order of kinetics were studied. Optimized BaSO4: Eu irradiated with doses from 1.25 to 50 mGy displayed a major TL peak at & AP;220 degrees C and exhibited a linear response with absorbed dose. The reusability test was performed for ten consecutive irradiations, readings, and annealing cycles, and showed a slight decrease in TL after the first cycle after which it was stabilized. Signal fading measurements were performed for irradiated samples over 50 days, where a signal loss of about 0.14 % per day was observed.
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