The role of activator concentration and precipitate formation on optical and dosimetric properties of KCl:Eu(2+) storage phosphor detectors.
The role of activator concentration and precipitate formation on optical and dosimetric properties of KCl:Eu(2+) storage phosphor detectors.
复制标题
活化剂浓度和沉淀形成对 KCl:Eu(2) 存储荧光粉探测器的光学和剂量学特性的作用。
DOI：
10.1118/1.4817522
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发表时间：
2013
期刊：
影响因子：
3.8
通讯作者：
HaroldLi,H
中科院分区：
文献类型：
--
作者：
Hansel,RachaelA;Xiao,Zhiyan;Hu,Yanle;Green,Olga;Yang,Deshan;HaroldLi,H
目的：KCl：Eu ~（2+）中的激活离子Eu ~（2+）在存储荧光体辐射探测器的光激励发光（PSL）机制中起着重要作用。为了设计一个准确、有效和耐用的检测器，重要的是要了解活化剂离子浓度如何影响KCl：Eu 2+的结构，从而影响其辐射检测性能。Eu2+）。用6 MV直线加速器给予临床放射剂量。放射剂量大于100戈伊，采用~（137）Cs辐照器。使用实验室PSL读出系统测量剂量响应曲线、辐射硬度和时间信号稳定性。用X射线衍射和荧光光谱对材料的晶体结构进行了研究。EU.然而，浓度高于0.05摩尔%的样品当累积剂量大于3000戈伊时，Eu的光致发光强度显著下降。结构和发光光谱显示出明显的证据，沉淀相内的KCl晶格，特别是对于高活化剂浓度。荧光发射光谱分析表明，Eu-Vc偶极和Eu-Vc三聚体之间的相互作用可以解释PSL灵敏度和辐射硬度观测结果的趋势。结论：激活离子（Eu 2+）的浓度显著影响KCl：Eu 2+存储荧光粉的辐射探测性能。活化剂浓度在0.01和0.05摩尔%之间Eu在KCl：Eu 2+存储磷光体探测器的建议，线性剂量响应，良好的PSL灵敏度，可预测的时间稳定性，和兆伏级辐射检测的高可重复使用性。
Purpose:The activator ion (Eu2+in KCl:Eu2+) plays an important role in the photostimulated luminescence (PSL) mechanism of storage phosphor radiation detectors. In order to design an accurate, effective, and robust detector, it is important to understand how the activator ion concentration affects the structure and, consequently, radiation detection properties of KCl:Eu2+.Methods:Potassium chloride pellets were fabricated with various amounts of europium dopant (0.01–5.0 mol.% Eu2+). Clinical radiation doses were given with a 6 MV linear accelerator. Radiation doses larger than 100 Gy were given with a137Cs irradiator. Dose response curves, radiation hardness, and temporal signal stability were measured using a laboratory PSL readout system. The crystal structure of the material was studied using x ray diffraction and luminescence spectroscopy.Results:The most intense PSL signal was from samples with 1.0 mol.% Eu. However, samples with concentrations higher than 0.05 mol.% Eu exhibited significant degradation in PSL intensity for cumulated doses larger than 3000 Gy. Structural and luminescence spectroscopy showed clear evidence of precipitate phases within the KCl lattice, especially for high activator concentrations. Analysis of PL emission spectra showed that interactions between Eu‐Vcdipoles and Eu‐Vctrimers could explain trends in PSL sensitivity and radiation hardness observations.Conclusions:The concentration of the activator ion (Eu2+) significantly affects radiation detection properties of the storage phosphor KCl:Eu2+. An activator concentration between 0.01 and 0.05 mol.% Eu in KCl:Eu2+storage phosphor detectors is recommended for linear dose response, good PSL sensitivity, predictable temporal stability, and high reusability for megavoltage radiation detection.