Synthesis, RL and OSL characterization of thulium doped NaMgF3 neighborite. (February 2021)

• Record Type: Journal Article
• Authors: Camargo, L.; Pérez Cruz, L.; Cruz-Zaragoza, E.; Chávez García, M.L.; Santiago, M.; Marcazzó, J.
• Is Part Of: Applied radiation and isotopes. Volume 168(2021)
• Publication Date: 2021-02
• Subjects: Optically stimulated luminescence -- NaMgF3 -- Dosimetry; Radiology -- Periodicals; Radiation -- Industrial applications -- Periodicals; Nuclear chemistry -- Periodicals; Internet resource; Periodical; 660.298
• DOI: 10.1016/j.apradiso.2020.109516
• Languages: English
• ISSNs: 0969-8043

Abstract

Abstract: The aim of this work is to study the dosimetric properties of tissue-equivalent thulium doped NaMgF3 neighborites and to determine their possible application as dosimeters in personal dosimetry. In this aspect, radioluminescence (RL) and optically stimulated luminescence (OSL) dosimetric properties of undoped and Tm 3+ -doped NaMgF3 have been investigated for the first time. Samples were synthesized by solid state reaction and by considering a stoichiometric mixture of pure NaF and MgF2 reagents. Two emission peaks centered at 460 and 360 nm have been found in the RL emission spectrum of the doped samples, which can be ascribed to the 1 D2 – 3 F4 and 1 D2 – 3 H6 transitions of Tm 3+ cations, respectively. Maximum OSL emission under blue light stimulation has been found for samples doped with 0.2 mol % of thulium. Furthermore, the OSL signal of this compound depends linearly on dose within the range 0.05–100 Gy. Besides, its OSL signal features satisfactory repeatability and a minimum detectable dose of 0.04 Gy. Finally, it has been found a low fading of the OSL signal of approximately 13% after the first 60 h, after which the OSL response remains constant. The obtained results suggest the feasibility of using this compound as an OSL detector in personal dosimetry. Highlights: OSL dosimetry properties of NaMgF3:Tm have been investigated for the first time. Compound doped with 0.2 mol % of thulium has the highest OSL efficiency. Very good linearity in the dose range from of 0.05–100 Gy was found. A minimum detectable dose of 0.04 Gy was obtained. OSL signal has pretty low fading of 13% in the first 60 h.