Patent ID: 8193509

Claim:
A radiation image detector comprising: an image data generation section including, a detection section in which a plurality of radiation detection elements are two-dimensionally arranged so as to be capable of extracting an electric signal of each pixel, a reading section to read the electric signal obtained by the detection section, and an arithmetic section; a communication section to transmit image data generated by the image data generation section to an outside of the radiation image detector; an internal power supply section, which is capable of being charged, to supply power to each of the sections including the detection section and the reading section; an external power supply terminal to receive power from an external power source so as to allow the internal power supply section to be charged; and a power supply control section to control supply of the power to the internal power supply section, the power being received from the external power source via the external power supply terminal, wherein when the power supply control section detects that the external power supply terminal receives power from the external power source, the power supply control section judges an operating state of each of the sections, and controls supply of the power to the internal power supply section according to the operating state of each of the sections, the power being received from the external power source via the external power supply terminal.