Patent ID: 8750457

Claim:
An X-ray radiography apparatus, comprising: an X-ray generator which generates an X-ray, an X-ray detector which detects an X-ray from said X-ray generator that has been transmitted through a subject, a controller which controls said X-ray generator and said X-ray detector, wherein said X-ray generator has an X-ray tube comprising an electron source configured to emit electrons in response to application of a voltage, a transmission-type target configured to generate the X-ray due to collision of electrons emitted from said electron source, and a shield member disposed between said electron source and said transmission-type target, said shield member having an opening through which electrons emitted from said electron source pass, said shield member being configured to block an X-ray that scatters toward said electron source, and said controller, when generating the X-ray, starts application of a voltage between said transmission-type target and said electron source, and causes emission of electrons from said electron source after passage of a predetermined period from the start of voltage application until the voltage between said transmission-type target and said electron source reaches a predetermined voltage, and when stopping generation of the X-ray, stops application of the voltage between said transmission-type target and said electron source after stopping the emission of electrons from said electron source.