Patent ID: 7649177

Claim:
A radiation image detector comprising: a first electrode for transmitting an electromagnetic wave for recording, the electromagnetic wave carrying a radiation image; a photoconductive layer for recording; a plurality of charge-collecting electrodes; and a substrate, wherein the photoconductive layer for recording generates charges by irradiation with the electromagnetic wave for recording that has been transmitted through the first electrode, and wherein the photoconductive layer for recording has amorphous selenium as its major component and further contains alkali metal, and wherein the first electrode, the photoconductive layer for recording, the plurality of charge-collecting electrodes and the substrate are superposed one on another in this order, and wherein an amorphous selenium layer is further provided as an anti-crystallization layer between the first electrode and the photoconductive layer for recording, and wherein the amorphous selenium layer contains at least one element selected from the group consisting of As, Sb and Bi, and wherein the anti-crystallization layer includes at least a region in which the value of the concentration of the at least one element is highest and a region in which the value of the concentration of the at least one element is less than or equal to 80% of the highest value of the concentration of the at least one element.