Patent ID: 8022451

Claim:
A radiation detector, comprising: i) a voltage applying electrode, to which a voltage is to be applied, ii) a photo-conductor layer, which generates electric charges when radiation is irradiated to the photo-conductor layer, and iii) a charge collecting electrode, which collects the electric charges corresponding to a quantity of the radiation, the voltage applying electrode, the photo-conductor layer, and the charge collecting electrode being overlaid one upon another, and a charge transporting layer on the photoconductor layer; wherein a selective charge transporting layer is located between an edge region of the voltage applying electrode and the photo-conductor layer, the selective charge transporting layer having characteristics such that the selective charge transporting layer blocks electric charges having a polarity identical with the polarity of the voltage applying electrode and transports electric charges having a polarity opposite to the polarity of the voltage applying electrode, and the selective charge transporting layer is in direct contact with the voltage applying electrode at a position corresponding to the edge region of the voltage applying electrode; wherein the charge transporting layer is insulative with respect to electric charges having the same polarity as the polarity of the voltage applying electrode, and conductive with respect to electric charges having a polarity opposite the polarity of the voltage applying electrode; and the charge transport layer is provided across the entire undersurface of the voltage applying electrode.