Mundupuzhakal J K, Biswas R H, Chauhan S, Varma V, Acharya Y B, Chakrabarty B S
Department of Applied Physics, Faculty of Technology, MS University of Baroda, Vadodara 390001, India
Department of Applied Physics, Okayama University of Science, Okayama 700-0005, Japan.
Radiat Prot Dosimetry. 2015 Dec;167(4):419-24. doi: 10.1093/rpd/ncu333. Epub 2014 Nov 13.
Nano-CaF2, prepared by the co-precipitation method, was annealed under different annealing conditions to improve its thermoluminescence (TL) characteristics. Different annealing parameters, such as temperature (400-700°C), duration (1-4 h) and environment (vacuum and air), were explored. The effect on TL sensitivity, peak position (Tm) and full-width at half-maximum (FWHM) with respect to the different annealing conditions are discussed as they are the measure of crystallinity of the material. Annealing temperature of 500°C with annealing duration of two and a half hours in vacuum provided the highest luminescence response (i.e. maximum sensitivity, minimum peak temperature and FWHM). Wide detectable dose range (5 mGy to 2 kGy), absence of thermal quenching and sufficient activation energy (1.04 eV) of this phosphor make it suitable for dosimetric applications.
通过共沉淀法制备的纳米CaF2在不同退火条件下进行退火，以改善其热释光（TL）特性。研究了不同的退火参数，如温度（400 - 700°C）、持续时间（1 - 4小时）和环境（真空和空气）。讨论了不同退火条件对TL灵敏度、峰值位置（Tm）和半高宽（FWHM）的影响，因为它们是材料结晶度的度量。在真空中500°C的退火温度和两个半小时的退火持续时间提供了最高的发光响应（即最大灵敏度、最低峰值温度和FWHM）。这种磷光体具有宽的可检测剂量范围（5 mGy至2 kGy）、无热猝灭以及足够的激活能（1.04 eV），使其适用于剂量测定应用。
