The goal of this work is to understand the physical mechanism behind the signal stabilization process in KCl:Eu2+, a storage phosphor material that has generated renewed interest due to its potential in radiation therapy dosimetry application. The temperature dependency of the photostimulated luminescence (PSL) spectra and intensity vs. time post x ray irradiation was measured. Commercial BaFBr:Eu2+ materials were included in this study for comparison. Unlike BaFBr:Eu2+, broadening of the F(Cl-) stimulation band and red-shift of the peak were observed for KCl:Eu2+ with increasing temperature. For irradiations at temperatures lower than 200 K, PSL intensity of KCl:Eu2+ showed recuperation behavior in the first 2 hrs post-irradiation and stayed almost constant with time thereafter. Moreover, spatially-correlated storage centers increased from 24% for irradiation at 50 K to 31% at 195 K and almost 100% at room temperature. The data suggest that certain types of charge storage-centers were mobile and contribute to the fast fading in PSL.

中文翻译：

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KCl:Eu2+ 中光致发光的温度依赖性

这项工作的目标是了解 KCl:Eu2+ 信号稳定过程背后的物理机制，KCl:Eu2+ 是一种存储磷光体材料，由于其在放射治疗剂量测定应用中的潜力而重新引起人们的兴趣。测量了 X 射线照射后光刺激发光 (PSL) 光谱和强度对时间的温度依赖性。商业 BaFBr:Eu2+ 材料包括在本研究中以进行比较。与 BaFBr:Eu2+ 不同，随着温度升高，KCl:Eu2+ 的 F(Cl-) 刺激带变宽和峰红移。对于温度低于 200 K 的辐照，KCl:Eu2+ 的 PSL 强度在辐照后的前 2 小时内表现出恢复行为，并且此后随时间几乎保持恒定。而且，空间相关的存储中心从 50 K 辐照的 24% 增加到 195 K 时的 31% 和室温下几乎 100%。数据表明，某些类型的电荷存储中心是可移动的，并有助于 PSL 的快速衰减。