X-ray generation apparatus and X-ray radiographic apparatus

An X-ray generation apparatus of transmission type comprising:

• an electron emission source;
• and
• a target generating an X-ray with collision of electrons emitted from the electron emission source against the target,
• wherein the X-ray generation apparatus further comprises a secondary X-ray generation portion generating an X-ray with collision of electrons reflected by the target against the secondary X-ray generation portion, and
• the secondary X-ray generation portion and the target are arranged such that the X-ray generated with the direct collision of the electrons against the target and the X-ray generated with the collision of the electrons reflected by the target against the secondary X-ray generation portion are both radiated to an outside,
• an electron passage surrounded by and formed in an electron passage forming member, and positioned on one side of the target closer to the electron emission source,
• wherein the electrons emitted from the electron emission source collide against the target after passing through the electron passage,
• wherein a cross-sectional area of the electron passage at least at an end thereof on a side closer to the target is larger than a cross-sectional area of the electron passage on a side farther away from the target, and at least a part of an inner wall surface of a region of the electron passage where the cross-sectional area thereof is increased serves as the secondary X-ray generation portion, and
• wherein the cross-sectional area of the electron passage is increased toward at least the end thereof on the side closer to the target with a step-like change.

An X-ray generation apparatus of transmission type comprising:

• an electron emission source;
• and
• a target generating an X-ray with collision of electrons emitted from the electron emission source against the target,
• wherein the X-ray generation apparatus further comprises a secondary X-ray generation portion generating an X-ray with collision of electrons reflected by the target against the secondary X-ray generation portion, and
• the secondary X-ray generation portion and the target are arranged such that the X-ray generated with the direct collision of the electrons against the target and the X-ray generated with the collision of the electrons reflected by the target against the secondary X-ray generation portion are both radiated to an outside,
• an electron passage surrounded by and formed in an electron passage forming member, and positioned on one side of the target closer to the electron emission source,
• wherein the electrons emitted from the electron emission source collide against the target after passing through the electron passage,
• wherein a cross-sectional area of the electron passage at least at an end thereof on a side closer to the target is larger than a cross-sectional area of the electron passage on a side farther away from the target, and at least a part of an inner wall surface of a region of the electron passage where the cross-sectional area thereof is increased serves as the secondary X-ray generation portion,
• wherein the cross-sectional area of the electron passage is continuously increased toward at least the end thereof on the side closer to the target, and
• wherein the cross-sectional area of the electron passage is linearly increased toward at least the end thereof on the side closer to the target.