Radiation image detection apparatus including photographic mode and irradiation detection mode with power saving control unit and radiation image photographing system including the same

A radiation image detection apparatus, comprising:

• an image receiving unit having a two-dimensional array of a plurality of pixels that generate electrical charges when being subjected to irradiation of radiation, the plurality of pixels including:
• a plurality of pixels for detecting image;
• and
• one or more pixels for detecting irradiation;
• an image data generation unit configured to generate an image data based on an electrical signal output from the respective pixels for detecting image;
• an irradiation detection unit configured to detect an irradiation of radiation based on the electrical signal output from the respective pixels for detecting irradiation;
• and
• a control unit configured to include a plurality of control modes including a photographing mode generating an image data and an irradiation detection mode detecting an irradiation of radiation,
• wherein the image data generation unit includes a first amplifying unit amplifying the electrical signal output from the respective pixels for detecting image and a data processing unit converting the electrical signal amplified by the first amplifying unit into the image data, and is configured to separately supply operating current to each of the first amplifying unit and the data processing unit so that the first amplifying unit and the data processing unit are independently driven, and
• wherein the control unit is configured to, during the irradiation detection mode, stop supplying of an operating power to the data processing unit until the irradiation of radiation is detected by the irradiation detection unit, and when the irradiation of radiation is detected by the irradiation detection unit, the control unit is configured to proceed to the photographing mode and begin supplying the operating power to the data processing unit.