摘要
X光转换材料在数字辐射成像系统中具有很重要的作用,它的效率对整个系统的量子探测效率起到决定性的作用。对CsI∶Tl晶体在X光激发下的发光效率进行详细分析,根据 X光在物质中的衰减和吸收规律,从理论上推导了其对X光转换效率的关系,并建立了利用 CCD相机作接收系统时的图像数据的表达形式,表明该系统输出与入射X光照射量成线性关系;并在30 MeV射频加速器上进行了实验验证。
The X-ray conversion material in radiophotography system plays a very important role. Its efficiency is a crucial factor to improve the system QDE(quantum detection efficiency). The luminescent efficiency of CsI∶Tl crystal excited by X-ray is analyzed in detail and the efficiency formula of the system adopting CCD camera,CsI∶Tl crystal is derived. The formula shows that the output of such a radiophotography system is proportional to the irradiation flux of incident X-ray. The QDE of such a system can be easily improved by changing the CsI∶Tl crystal thickness. Some experimental data obtained from a 30MeV electron linear accelerator are given to prove the linear relationship.
出处
《强激光与粒子束》
EI
CAS
CSCD
北大核心
2005年第2期203-205,共3页
High Power Laser and Particle Beams
基金
国防科技基础研究基金资助课题
关键词
发光效率
量子探测效率
X光转换材料
线性响应
Luminescent efficiency
Quantum detection efficiency
X-ray conversion material
Linear response
