JPS5790630A - X-ray photosensitive element - Google Patents

Abstract

PURPOSE:To increase the electric charge quantity forming electrostatic latent images and obtain sharp reproduced images by constituting an X-ray photoreceptor layer of an X-ray photosensitive element of a selenium layer and a material layer of a high X-ray absorption effect. CONSTITUTION:In an X-ray photosensitive layer consisting of electrodes 1, 5, a dielectric layer 2, an X-ray photoreceptor layer 4, etc., the X-ray photosensitive layer is formed of a selenium layer 4, and a material layer of high X-ray absorption efficiency, for example, a lead oxide layer 7. Lead oxide has a higher coefft. of X-ray absorption as compared to selenium, and the coefft. of absorption is proportional to the rate of light carrier generation by X-ray exposure. Hence, the number of carrier generation is larger in the layer 7 than in the layer 4 with respect to the same X-ray energy, and out of the light carriers generated in the layer 7, positive charge travels into the layer 4; hence, the quantity of electrostatic charge in the surface of the layer 4 increases and the quantity of the charge charged in the surface of the dielectric 2 increases as well, so that the much more developer is absorbed in the surface of the dielectric 2 at the developing.