Trapping parameters determination and modeling of the thermoluminescence process in K₂GdF₅:Dy³⁺

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• 作者：Ahmed Kadari^a ; ^b ; ^{kadariahmed14@yahoo.fr" class="auth_mail" title="E-mail the corresponding author} ; ^{ahmed.kadari27@gmail.com" class="auth_mail" title="E-mail the corresponding author} ; Nicholas M. Khaidukov^c ; Rabah Mostefa^b ; E.C. Silva^d ; Luiz O. Faria^e
• 关键词：Thermoluminescence ; Trapping parameters ; Model ; Dose
• 刊名：Optik - International Journal for Light and Electron Optics
• 出版年：2016
• 出版时间：April 2016
• 年：2016
• 卷：127
• 期：8
• 页码：3959-3963
• 全文大小：611 K

文摘

K₂GdF₅:Dy crystals show excellent TL output for fast and thermal neutrons. An additional thermoluminescent peak, as yet unidentified, is revealed in TL of K₂GdF₅ doped with different dysprosium Dy³⁺ concentrations, after exposing to 12.1 mSv of gamma radiation. In 2013, Silva et al., have studied the thermoluminescent responses of K₂GdF₅: Dy³⁺ exposed to photon and neutron radiation fields. The results presented in this paper show that the introduction of the dysprosium Dy³⁺ induced the appearing of an additional TL peak at 234 °C (507 K). Particularly, for K₂GdF₅ crystals doped exactly with 5.0 at.% Dy³⁺, the TL output reaches its maximum. In the first part of this paper, the glow curves of the pure and doped K₂GdF₅ after gamma radiation were analyzed and the kinetics parameters (trap depth (E) and frequency factor (s)) were determined by using the Chen's peak shape method. The appearance of the additional peak has been explained and attributed to the energy transfer that occurs from Gd³⁺ to Dy³⁺. The mechanisms of the charge transfer have been studied carefully based on the excitation spectra of the Dy³⁺ doped K₂GdF₅ crystal at the wavelengths 575 nm and 485 nm, respectively. In the second part of this paper; the thermoluminescence properties of both the pure K₂GdF₅ and Dy³⁺ doped K₂GdF₅ have been investigated using the 3T1R and 4T1R models, respectively.