a binary screen , system and method for performing dual energy radiographic imaging , using single pulse x - rays , are depicted . the binary screen includes a first phosphor which emits light of a first wavelength and a second phosphor which emits light of a second wavelength . the first and second phosphors are heterogeneously dispersed in the binary screen . the first phosphor is preferably gd 2 o 2 s : eu + 3 and the second phosphor is preferably y 2 o 2 s : gd + 3 . the second phosphor can also be y 2 o 3 : gd , y 2 o 2 s : pr or y 2 o 2 s : neodymium .