新型掺Tb3+硅酸盐发光玻璃的研制
A new type Tb3＋ doped silicate luminescent glass
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摘要: 在数字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，其性能直接影响成像系统的性能。针对特殊用途开发了一种新型掺Tb3+硅酸盐发光玻璃转换屏，可用于30 MeV的γ光子的成像探测；在低能X光（100 keV）作用下的空间分辨能力与301型发光玻璃相当，而在能量高达12 MeV的X光的照射下，其空间分辨能力不低于1.5 lp/mm，发光效率约为301型发光玻璃的3倍。并对其性能进行了实验研究，相应的测量结果为：SiO2的质量分数达到50％以上时才能得到玻璃性质较好的材料，并使发光性能得到提高，BaO和Cs2O的质量分数接近相等的条件下，Tb3+离子的质量分数为10.5％时发光性能最好；适量的Gd3+离子可以敏化Tb3+发光，也能增加玻璃密度，而Ce3＋离子可以降低发光的余辉；其它的微量元素则主要影响玻璃的熔融温度。Abstract: X-ray to light convertor in a real time radiography image formation system plays an important role. A new type Tb3＋ doped silicate luminescent glass has been developed recently. There is no visible light dispersion in the glass and it can take the place of traditional rare earth fluorescent screen in high energy radiography applications. For its spatial resolution will not be greatly reduced when its thickness increases in a certain range, a thicker glass can be used to reach a higher DQE. The luminescent glass can be used in a radiography image formation system which adopts a high energy X-ray source up to 30 MeV. The spatial resolution is about the same as 301 type luminescent glass excitated by 100 keV X-ray and the spatial resolution may not be less than 1.5 lp/mm when excitated by 12
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Key words:
- luminescent glass /
- high energy x-ray /
- ccd /
- radiography
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