成像板发光原理及其特性  

Luminescence principle and characteristics of imaging plate

作　　者：王浩然 田宝贤[3] 薄楠 刘伏龙 贺创业[3] 贾少青 郭冰[3] 王乃彦[3] Wang Hao-Ran;Tian Bao-Xian;Bo Nan;Liu Fu-Long;He Chuang-Ye;Jia Shao-Qing;Guo Bing;Wang Nai-Yan(College of Nuclear Science and Technology,Beijing Normal University,Beijing 100875,China;Key Laboratory of Beam Technology of Ministry of Education,Beijing Normal University,Beijing 100875,China;China Institute of Atomic Energy,Beijing 102413,China;Atomic High Technol Company,Ltd,Beijing 102413,China)

机构地区：[1]北京师范大学核科学与技术学院,北京100875 [2]北京师范大学,射线束技术教育部重点实验室,北京100875 [3]中国原子能科学研究院,北京102413 [4]原子高科股份有限公司,北京102413

出　　处：《物理学报》2023年第16期173-180,共8页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:11935008)资助的课题.

摘　　要：由于成像板(imaging plate,IP)对电磁辐射场不敏感,因而作为探测介质被广泛应用于激光驱动的辐射粒子诊断设备中,在使用前需要对其特性和物理机制进行研究.利用^(90)Sr/^(90)Y电子源测量BAS-SR和BAS-TR两种IP板的时间衰减曲线,同时对长时间辐照的衰减曲线进行修正;刻度了BAS-SR和BAS-TR两种IP板对^(90)Sr/^(90)Y电子源的绝对灵敏度,其分别为(0.033±0.002)PSL/e和(0.0180±0.0038)PSL/e(photostimulated light,PSL),与国际上大部分电子绝对刻度的结果基本相符,IP板对辐射粒子的绝对刻度依赖于IP板的类型、扫描设备和实验环境.此外对BAS-SR和BAS-TR两种IP板辐照后进行多次连续扫描,研究了信号强度变化趋势的规律.建立了用于描述辐射粒子在IP板荧光层中沉积能量、存储信息和信息读取微观物理过程的光激励发光模型,结合光激励发光模型建立的数学模型有效地阐释了IP板探测辐射粒子物理机制与其表现的特性之间的关系.这些研究可以为后续开展IP板应用于激光等离子体诊断实验提供一定的数据基础.The imaging plate(IP)is a reusable detector for detecting radiation particles in a complex electromagnetic field environment,and it is widely used as a detection medium in laser-accelerated particle beam diagnostic equipment.Therefore,it is necessary to study the performance characteristics and physical mechanism of IP.An electron source with known activity is used to explore the performance characteristics of IP.A ^(90)Sr/^(90)Y electron source is used to measure the time attenuation curve,calibrate the absolute sensitivity,and study the law of multiple scanning of BAS-SR and BAS-TR.In the case of a longer irradiation,the fading cannot be neglected,and the attenuation curves are modified.The time attenuation characteristics indicate that the IP should be cooled after irradiation,and the scanning should be carried out in the slow decay process to reduce the influence of the reading error in the decay process.The absolute sensitivity of BAS-SR and BAS-TR to ^(90)Sr/^(90)Y source are(0.033±0.002)PSL/e and(0.018±0.0038)PSL/e(photostimulated light,PSL),respectively,which are consistent with the results of most absolute sensitivity.The absolute sensitivity is closely related to the type of IP,scanning equipment,and experimental environment.In addition,the energy spectrum integral effect of the broad spectrum b source has a significant influence on the absolute sensitivity.This method is only suitable for the rough evaluation of the sensitivity characteristic parameters of the IP.Multiple scanning approximately satisfies the double exponential function distribution,which is consistent with the physical model.The characteristics of IP are determined by its storage principle.The fluorescence layer of IP is composed of typical electron trapping materials MFX(M=Ca,Sr,Ba;X=C1,Br,I)alkaline earth metal fluorhalide BaFBr.When the IP is irradiated,a large number of free electron-hole pairs are excited by the deposited energy in the material,and the free electrons will be captured by the electron trap,so the fluorescence laye

关 键 词：成像板 特性研究 光激励发光 

分 类 号：O4[理学—物理]