Yttrium tantalate x-ray phosphors with reduced persistence

摘要

A composition and method are provided for reducing the persistence of yttrium tantalate x-ray phosphors having the monoclinic M' structure. Persistence is reduced by incorporating a molybdenum or vanadium additive into the phosphor. The method for incorporating the molybdenum or vanadium additive consists of adding a molybdenum or vanadium containing compound to the mixture of raw materials formulated to make the phosphor and firing the mixture at a temperature and for a time sufficient to form the phosphor.