Thermoluminescent glow curve of Gd 1-x RE x AlO 3 (RE=Dy or Pr) beta irradiated phosphors.

Autor: Alonso Sotolongo A; Instituto de Investigación en Metalurgia y Materiales, Universidad Michoacana de San Nicolás de Hidalgo, Edif. 'U', C.U., Morelia, 58060, Michoacan, Mexico. Electronic address: 1651159k@umich.mx., RIvera Montalvo T; Instituto Politécnico Nacional, CICATA-Legaria, Legaria 694, Mexico City, 11500, Mexico City, Mexico. Electronic address: trivera@ipn.mx., Nolasco Altamirano D; Instituto Politécnico Nacional, CICATA-Legaria, Legaria 694, Mexico City, 11500, Mexico City, Mexico. Electronic address: dnalexus89@gmail.com., López-Luke T; Instituto de Investigación en Metalurgia y Materiales, Universidad Michoacana de San Nicolás de Hidalgo, Edif. 'U', C.U., Morelia, 58060, Michoacan, Mexico. Electronic address: tzarara@hotmail.com., Contreras García ME; Instituto de Investigación en Metalurgia y Materiales, Universidad Michoacana de San Nicolás de Hidalgo, Edif. 'U', C.U., Morelia, 58060, Michoacan, Mexico. Electronic address: ucontre@gmail.com., Zárate Medina J; Instituto de Investigación en Metalurgia y Materiales, Universidad Michoacana de San Nicolás de Hidalgo, Edif. 'U', C.U., Morelia, 58060, Michoacan, Mexico. Electronic address: jzarate@umich.mx.
Jazyk: angličtina
Zdroj: Applied radiation and isotopes : including data, instrumentation and methods for use in agriculture, industry and medicine [Appl Radiat Isot] 2023 Nov; Vol. 201, pp. 111019. Date of Electronic Publication: 2023 Sep 06.
DOI: 10.1016/j.apradiso.2023.111019
Abstrakt: Phosphors composed of Gd 1-x RE x AlO 3 (0≤x ≤ 5 RE = Dy or Pr) stoichiometries were synthesized using the reverse coprecipitation pathway. The thermoluminescent responses of all phosphors were studied under beta radiation exposure. Doping the gadolinium aluminate host improved the thermoluminescent response of the phosphors, with the phosphors composed of Gd 0.99 Dy 0.01 AlO 3 and Gd 0.95 Pr 0.05 AlO 3 being the most sensitive. The Dy 3+ ions produced a higher improvement of the thermoluminescent signal than the Pr 3+ ions. Additionally, a proportional relationship between the similarity of the atomic numbers of the dopant and replaced ions and the sensitivity to thermoluminescence was confirmed. Besides, a slight shift of the thermoluminescent peaks toward lower temperatures was detected for doped phosphors. In the repeatability tests applied to the phosphor composed of Gd 0.99 Dy 0.01 AlO 3 , an anomalous increase in sensitization was observed. The observed sensitization was associated with the formation of electron trap clusters resulting from the continuous exposure to beta radiation. Furthermore, another sensitization phenomenon was detected in the phosphor with Gd 0.95 Pr 0.05 AlO 3 stoichiometry when it was heated at low temperatures. The aforementioned striking behavior was related to quasi-continuous distributions of electron traps and the tunneling effect. In regard to linearity, the phosphor composed of Gd 0.99 Dy 0.01 AlO 3 exhibited a linear response with the dose across the entire range of beta doses. However, the response of the Gd 0.95 Pr 0.05 AlO 3 phosphor lost linearity beyond 26.4 Gy of beta dose. The results obtained through the use of the T max -T stop method and deconvolutions suggested an enhancement in the efficiency of the thermoluminescent mechanisms due to the incorporation of activators.
Competing Interests: Declaration of competing interest The authors declare the following financial interests/personal relationships which may be considered as potential competing interests: Juan Zarate Medina reports financial support was provided by National Council on Science and Technology (CONACYT-MEXICO).
(Copyright © 2023 Elsevier Ltd. All rights reserved.)
Databáze: MEDLINE
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