PROBLEM TO BE SOLVED: To provide a device and method capable of determining whether or not a correction object pixel in which loss occurs in the radiation is appropriately corrected.SOLUTION: A radiation imaging device acquires a radiation image on the basis of the amount of radiation detected by a radiation detection unit, and corrects a first pixel that is a correction object present in the radiation image by using a second pixel other than the first pixel. Then, the radiation imaging device removes a periodic signal from each of a radiation image after the correction and a radiation image before the correction, and determines whether or not the correction is appropriate on the basis of the radiation image after the correction from which the periodic signal is removed and the radiation image before the correction from which the periodic signal is removed.
