一旦人们为某种特殊用途研制出一种新材料后,那么一定会有另一种用途来利用这种新材料。稀土硫氧化物磷光体就是这种情况。原先是为医学诊断用的X射线增感屏而研制的。而现在Lockheed Missles and Space公司把它用到非损伤性监察体 Once people have developed a new material for a particular purpose, there is bound to be another use to take advantage of this new material. This is the case with rare earth oxysulfide phosphors. Originally developed for use in medical diagnostic X-ray intensifying screens. Now Lockheed Missles and Space uses it for non-invasive monitoring