Dejene Francis Birhanu, Etefa Habtamu Fekadu
Department of Physics, Walter Sisulu University, Private Bag X-1, 5117, Mthatha, South Africa.
Department of Physics, Walter Sisulu University, Private Bag X-1, 5117, Mthatha, South Africa.
Appl Radiat Isot. 2024 Dec;214:111522. doi: 10.1016/j.apradiso.2024.111522. Epub 2024 Sep 11.
The solution-combustion approach was used to create CaBO:Euphosphors using Ba (NO), Eu (NO)·5HO, HBO, NH(ON)H, and NHNO as source materials. We investigated the thermoluminescence (TL) characteristics of beta (β)-irradiated CaBO:Eu. When the TL intensity was evaluated at different dosages of β, it rose with the dose. Changes in peak temperature were observed because of the investigation of the effects of varying heating rates on TL glow curves. Moreover, the positions of the peak temperature and the TL intensity did not change when the same sample was measured again, suggesting that the sample was stable. Additionally, the study calculated several kinetic parameters, including activation energy (E), frequency factor (s), and geometrical factor (μg), for distinct TL glow curves. Through geometric analysis of TL glow peaks, the study determined activation energies and kinetic orders, enabling the calculation of the frequency factor. The findings highlight the suitability of the prepared phosphor for dosimetry and provide insights into trap characteristics crucial for continuous illumination at room temperature. The study also emphasises the importance of optimising trap depth for prolonged afterglow, shedding light on the interplay between trap energies and luminescence characteristics. These findings deepen our comprehension of phosphor behavior and open the door to better dosimetry applications.
采用溶液燃烧法,以Ba(NO₃)₂、Eu(NO₃)₃·5H₂O、H₃BO₃、C₆H₅NO₂和NH₄NO₃为原料制备了CaBO₃:Eu荧光粉。我们研究了β辐照CaBO₃:Eu的热释光(TL)特性。当在不同β剂量下评估TL强度时,它随剂量增加而升高。通过研究不同加热速率对TL发光曲线的影响,观察到了峰值温度的变化。此外,当再次测量同一样品时,峰值温度和TL强度的位置没有变化,表明样品是稳定的。此外,该研究还针对不同的TL发光曲线计算了几个动力学参数,包括活化能(E)、频率因子(s)和几何因子(μg)。通过对TL发光峰的几何分析,该研究确定了活化能和动力学级数,从而能够计算频率因子。这些发现突出了所制备荧光粉在剂量测定方面的适用性,并为室温下持续发光至关重要的陷阱特性提供了见解。该研究还强调了优化陷阱深度以实现长时间余辉的重要性,揭示了陷阱能量与发光特性之间的相互作用。这些发现加深了我们对荧光粉行为的理解,并为更好的剂量测定应用打开了大门。