Jain Aayushi, Seth Pooja, Tripathi Ambuj, Aggarwal Shruti
University School of Basic and Applied Sciences, Guru Gobind Singh Indraprastha University, Dwarka, Sec-16C, New Delhi, 10078, India.
Materials Science Group, Inter-University Accelerator Centre, New Delhi, 110067, India.
Appl Radiat Isot. 2022 Aug;186:110253. doi: 10.1016/j.apradiso.2022.110253. Epub 2022 Apr 25.
In the present work, the thermoluminescence (TL) properties of Yb doped CaSiO phosphor exposed to gamma rays and carbon (C) ion beam have been reported. The phosphor has been synthesized using solid-state reaction method. The formation and surface morphology of the phosphor have been studied using X-ray diffraction (XRD) and field emission scanning electron microscopy (FE-SEM) respectively. The optical band gap of the phosphor is determined using UV-Visible spectroscopy. TL properties on Yb doped CaSiO phosphor irradiated with carbon ion beam has been reported first time. Different TL properties like TL glow curve, dose response, fading etc. have been investigated in detail. The TL glow curve of CaSiO:Yb phosphor consists of two prominent glow peaks. Under gamma irradiation, the main dosimetric peak is centered at 141 °C and other peak is centered at 265 °C. The dose response behaviour has been studied in the range 10 Gy-1000 Gy. However, C ion beam irradiated phosphor also consists similar TL glow curve structure with glow peaks shifted towards high temperature side (approx. 50 °C). The dose response behaviour of C ion beam irradiated phosphor has been examined in the ion fluence range varying from 5 × 10-5 × 10 ions/cm. A track interaction model is used to explain the sublinearity at higher fluences of carbon ion beam. Different ion beam parameters have been analyzed using Monte-Carlo simulation-based SRIM code. A comparative TL study of the phosphor irradiated with gamma rays and carbon ion beam suggests that gamma irradiated phosphor has shown better TL properties such as high TL sensitivity, good linear dose response (10 Gy-500 Gy), stable TL glow curve structure and low fading. Various TL trapping parameters i.e. order of kinetics, activation energy and frequency factor have been calculated using Chen's peak shape method to analyze the nature of TL traps responsible for showing different behaviour of the phosphor towards both the radiations. Good TL properties of CaSiO:Yb phosphor supports its possible use in gamma dosimetry.
在本工作中，已报道了掺镱硅酸钙磷光体在γ射线和碳（C）离子束辐照下的热释光（TL）特性。该磷光体采用固态反应法合成。分别使用X射线衍射（XRD）和场发射扫描电子显微镜（FE-SEM）研究了磷光体的形成和表面形貌。利用紫外-可见光谱法测定了磷光体的光学带隙。首次报道了碳离子束辐照掺镱硅酸钙磷光体的TL特性。详细研究了不同的TL特性，如TL发光曲线、剂量响应、衰退等。CaSiO:Yb磷光体的TL发光曲线由两个明显的发光峰组成。在γ辐照下，主要剂量测定峰位于141℃，另一个峰位于265℃。已在10 Gy-1000 Gy范围内研究了剂量响应行为。然而，碳离子束辐照的磷光体也具有相似的TL发光曲线结构，发光峰向高温侧移动（约50℃）。已在5×10-5×10离子/cm的离子注量范围内研究了碳离子束辐照磷光体的剂量响应行为。使用径迹相互作用模型来解释碳离子束在较高注量下的亚线性。使用基于蒙特卡罗模拟的SRIM代码分析了不同的离子束参数。对γ射线和碳离子束辐照的磷光体进行的比较TL研究表明，γ辐照的磷光体表现出更好的TL特性，如高TL灵敏度、良好的线性剂量响应（10 Gy-500 Gy）、稳定的TL发光曲线结构和低衰退。使用陈的峰形方法计算了各种TL俘获参数，即动力学级数、活化能和频率因子，以分析导致磷光体对两种辐射表现出不同行为的TL陷阱的性质。CaSiO:Yb磷光体良好的TL特性支持其在γ剂量测定中的可能应用。
