用于高能X光转换的掺Tb<sup>3＋</sup>硅酸盐发光玻璃性能研究

在高能的数字X射线成像系统中使用的X光可见光转换屏具有相当重要的作用,直接影响成像系统的性能。针对特殊用途研制的一种掺Tb3＋硅酸盐发光玻璃转换屏,可用于能量高达30 MeV的γ光子的成像探测;在百keV级的低能X光作用下的空间分辨力与301型发光玻璃相当,而在能量高达12 MeV X光的照射下,其空间分辨力不低于1.5 lp/mm,发光效率约为301型发光玻璃的3倍,并对发光玻璃的相关性能与其组成进行了实验研究,给出了相应的测量结果。

Abstract

X-ray to light convertor in a real time radiography image formation system plays an important role. A new type of Tb3＋-doped silicate luminescent glass has been developed recently. It can take the place of traditional rare earth fluorescent screen in high energy radiography applications because of no visible light dispersion in it. For its spatial resolution will not greatly reduce when its thickness increases within a certain range, a thicker glass can be used in order to reach a higher DQE. The luminescent glass can be used in a radiography image formation system which adopt a high energy X-ray source up to 30 MeV. The spatial resolution is about the same as 301 type luminescent glass excited by 100 keV X-ray and the spatial resolution may not be less than 1.5 lp/mm when excited by 12 MeV X-ray. Its luminescence intensity is about 3 times of 301 type. Some effects on its characters of main ingredient materials (BaO, Cs2O, Tb2O3, Gd2O3, Ce2O3) are also researched in the way of changing the mass percentage and appropriate ingredient configuration for high performance is derived. Optical performances are tested and results are given out.

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江孝国, 顾镇南, 祖成奎. 用于高能X光转换的掺Tb^3＋硅酸盐发光玻璃性能研究[J]. 光学学报, 2005, 25(7): 953. 江孝国, 顾镇南, 祖成奎. Research on Performance of Tb^3＋-Doped Silicate Luminescent Glass for High-Energy X-Ray Application[J]. Acta Optica Sinica, 2005, 25(7): 953.

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