X光作用下CsI:Tl晶体的转换效率研究
Conversion efficiency of the CsI∶Tl crystal excited by X-ray
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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。Abstract: 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 Xray 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．
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