Electroradiographic recording device

In an electroradiographic recording device having a source of x-rays, a first electrode adapted for passing x-rays spaced from said x-ray source and defining therebetween a recording space for an object to be examined, a layer of dielectric material disposed on the side of said first electrode remote from said recording space, a second electrode spaced from said first electrode, a photoconductive layer disposed on the side of said second electrode adjacent said dielectric material, said photoconductive layer and said dielectric material being spaced from each other to define a gas gap therebetween, said gas gap being bounded by at least one side wall arranged between said electrodes, and a direct voltage source connected between said electrodes, an improvement wherein said photoconductive layer comprises a granular photoconductive material in a binder, said gas gap between said dielectric material and said photoconductive layer is between 50 .mu.m and 500 .mu.m wide, and said first electrode has a surface resistance between 10.sup.3 to 10.sup.8 Ohms per square.