Patent ID: 8416921

Claim:
An X-ray convergence element, in which X-rays entering from an entrance-side opening end of a tubular body are reflected on an inner surface of the tubular body, and the reflected X-rays exit from an exit-side opening end of the tubular body while being converged, the X-ray convergence element, comprising: an X-ray blocking member positioned adjacent the entrance-side opening end, having a diameter smaller than a diameter of the entrance-side opening end, a thickness of the X-ray blocking member, along a central axis of the tubular body, being different in a radial direction, and the center of the X-ray blocking member being arranged on the center axis of the tubular body, wherein a configuration of the varying side radial surface of the X-ray blocking member reflects incident X-rays to be equal to or greater than a total reflected optimal angle of the inner surface of the tubular body to enable reflected X-rays to pass through the tubular body.