X-RAY EXPOSURE REDUCTION USING RARE-EARTH OXYSULFIDE INTENSIFYING SCREENS
X-RAY EXPOSURE REDUCTION USING RARE-EARTH OXYSULFIDE INTENSIFYING SCREENS
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DOI：
10.1148/105.1.185
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发表时间：
1972-01-01
期刊：
影响因子：
19.7
通讯作者：
FINKELSTEIN, SI
中科院分区：
文献类型：
--
作者：
BUCHANAN, RA;WICKERSHEIM, KA;FINKELSTEIN, SI
比较了铽激活的硫氧化钆和硫氧化镧与钨酸钙的特性。新的稀土磷光体在38至70千电子伏区域相对于钨酸钙具有更高的X射线吸收。它们还表现出更大的X射线到可见光的能量转换效率。然而，稀土磷光体主要在绿色光谱区域中发射，因此与蓝色敏感的X射线胶片的光谱响应不匹配。尽管有这个缺点，氧硫化钆屏幕允许相对于提供等效分辨率的钨酸钙屏幕显著减少X射线暴露。当更快的绿色敏感X射线胶片可用时，预计会进一步减少曝光。
The characteristics of terbium-activated gadolinium oxysulfide and lanthanum oxysulfide are compared with those of calcium tungstate. The new rare-earth phosphors have higher x-ray absorption in the 38 to 70 keV region relative to calcium tungstate. They also exhibit a larger x-ray-to-visible light energy conversion efficiency. Rare-earth phosphors, however, emit primarily in the green spectral region and thus poorly match the spectral response of blue-sensitive x-ray film. Despite this disadvantage, gadolinium oxysulfide screens allow a significant x-ray exposure reduction relative to calcium tungstate screens providing equivalent resolution. An additional exposure reduction is anticipated when faster green-sensitive x-ray film becomes available.