Patent Number: 
Section: claims

1. An X-ray detection apparatus comprising:a sample support unit;an X-ray irradiation unit, which is located with an exit of X-rays faced to a predetermined part of the sample support unit, structured to irradiate a sample supported by the sample support unit with X-rays;an X-ray detector, which is located with an entrance of X-rays faced to the predetermined part of the sample support unit, structured to detect fluorescent X-rays generated from the sample;a collimator structured to narrow X-rays to be used for irradiation of the sample by the X-ray irradiation unit; anda shield disposed to block X-rays emitted from the X-ray irradiation unit from passing through a path linking the exit of the X-ray irradiation unit with the entrance of the X-ray detector in a straight line, and the shield being further disposed to block fluorescent X-rays generated by the collimator or scattered X-rays generated by the collimator from passing through a path linking an arbitrary part of the collimator with the entrance of the X-ray detector in a straight line. 2. The X-ray detection apparatus according to claim 1,wherein the shield includes:a first shielding member configured to block X-rays passing through a path linking the exit with the entrance; anda second shielding member configured to block X-rays passing through a path linking the first shielding member and the collimator with the entrance. 3. The X-ray detection apparatus according to claim 2,wherein the collimator has a plate-like shape, andthe shield is projected from both faces of the collimator. 4. The X-ray detection apparatus according to claim 2,wherein the shield has a shape not to block an X-ray path from a sample supported by the sample support unit to the entrance. 5. The X-ray detection apparatus according to claim 2,wherein the shield is joined with the collimator. 6. The X-ray detection apparatus according to claim 5,wherein the collimator includes a plurality of apertures configured to narrow X-rays, andthe shield and the collimator move to change an aperture through which X-rays pass. 7. The X-ray detection apparatus according to claim 1,wherein the collimator has a plate-like shape, andthe shield is projected from both faces of the collimator. 8. The X-ray detection apparatus according to claim 1,wherein the shield has a shape not to block an X-ray path from a sample supported by the sample support unit to the entrance. 9. The X-ray detection apparatus according to claim 1,wherein the shield is joined with the collimator. 10. The X-ray detection apparatus according to claim 9,wherein the collimator includes a plurality of apertures configured to narrow X-rays, andthe shield and the collimator move to change an aperture through which X-rays pass.