To provide a mechanism in which preferred correction of a crosstalk component can be performed for a detection signal for monitoring irradiation with radiation.SOLUTION: A radiation imaging apparatus comprises: a radiation detection unit 113 that is constituted to include a detection pixel 1131 for performing at least either one detection of detection of an irradiation start of radiation, detection of an irradiation stop of the radiation, and detection of an accumulated irradiation amount of the radiation； and an imaging apparatus control unit 118 that switches between a first correction method in which a first output signal being an output signal of the detection pixel 1131 when a first switch 11312 of the detection pixel 1131 is in a conductive state is corrected using a second output signal being the output signal of the detection pixel 1131 when the first switch 11312 of the detection pixel 1131 is in a non-conductive state, and a second correction method in which the first output signal is corrected using other output signal being different from the second output signal, to select.SELECTED DRAWING: Figure 2【課題】放射線の照射をモニタするための検知信号に対して好適なクロストーク成分の補正を行える仕組みを提供する。【解決手段】放射線の照射開始の検知、前記放射線の照射停止の検知及び前記放射線の積算照射量の検知のうちの少なくともいずれか１つの検知を行うための検知用画素１１３１を含み構成されている放射線検出部１１３と、検知用画素１１３１の第１スイッチ１１３１２が導通状態の際の検知用画素１１３１の出力信号である第１の出力信号を、検知用画素１１３１の第１スイッチ１１３１２が非導通状態の際の検知用画素１１３１の出力信号である第２の出力信号を用いて補正する第１の補正方法と、第１の出力信号を、第２の出力信号とは異なる他の出力信号を用いて補正する第２の補正方法とを切り替えて選択する撮像装置制御部１１８を備える。【選択図】図２
