Patent ID: 7855369

Claim:
A radiation imaging element comprising: radiation sensors disposed in a matrix so as to output signal charges corresponding to radiation transmitted through a subject, and thin film field effect transistors for readout of signals from the radiation sensors, wherein: each thin film field effect transistor comprises at least a gate electrode, a gate insulating layer, an active layer, a source electrode and a drain electrode; the active layer comprises at least a first region and a second region which has an electric conductivity larger than an electric conductivity of the first region; the second region is in contact with the gate insulating layer; the first region is disposed so as to be electrically connected between the second region and at least one of the source electrode or the drain electrode; and at least the first region and the second region of the active layer are formed as separate layers on a substrate of the thin film field effect transistor, the layer of the second region is in contact with the gate insulating layer, and the layer of the first region is in contact with at least one of the source electrode or the drain electrode.