Radiation detector and radiation imaging system

A radiation detector comprising:

• a pixel array in which pixels each having a radiation detection element configured to convert radiation into charges and an amplification transistor configured to amplify a signal from the radiation detection element and output the amplified signal are arrayed in a matrix shape;
• and
• signal wiring provided for each pixel column,
• wherein the signal wiring does not overlap an active layer, in which the amplification transistor is arranged, in a plan view,
• wherein the signal wiring includes at least two signal wiring lines arranged with respect to one pixel column,
• wherein the pixels have power supply wiring arranged parallel to the signal wiring line,
• wherein an interval between an adjacent signal wiring line is smaller than an interval between the signal wiring line, which is adjacent to the power supply wiring, and the power supply wiring,
• wherein the pixels include a reset transistor, and
• wherein the power supply wiring includes first power supply wiring that supplies a drain potential of the amplification transistor, second power supply wiring that supplies a well potential, and third power supply wiring that supplies a drain potential of the reset transistor.