Radiation imaging apparatus, radiation imaging system, and control method for the radiation imaging apparatus

摘要

A radiation imaging apparatus includes a pixel array (101) including a plurality of pixels (110) arranged in a matrix in which each pixel includes a conversion element (S) arranged to convert radiation into a charge and a switch element (T) arranged to transfer an electric signal based on the charge, a bias wiring (Vs) that supplies the conversion element with a voltage for the conversion element to convert the radiation into the charge, a power supply unit (107) arranged to supply the voltage to the bias wiring; and a detecting unit arranged to detect start of radiation irradiation to the pixel array, in which the detecting unit includes a detecting circuit (108a) arranged to detect the radiation irradiation start to the pixel array on the basis of a comparison result through computation on at least two currents flowing through at least two bias wirings among the plurality of bias wirings.