| 摘要 |
<p>A radiation detector includes an image data detecting means that detects, as radiographic image data, charge information corresponding to applied radiation; a controlling means that determines that radiation has been applied if a read value of the detected charge information is equal to or greater than a threshold value and controls the image data detecting means to acquire radiographic image data corresponding to radiation that has passed through a subject; and a changing means that changes the threshold value in accordance with temperature data of the image data detecting means.
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