The phosphor and the X-rays intensifing screen according to the present inventin emit light by the excitation of X-ray, and they are used for medical and industrial radiography. In addition to the conventional contents of rare earth tantalate and/or rare earth niobate, the phosphor according to the present...http://www.google.com.tw/patents/US5250366?utm_source=gb-gplus-share專利 US5250366 - Phosphor which emits light by the excitation of X-ray, and a X-ray intensifying screen using the phosphor
