Patent Number: 
Section: claims

1. An imaging method for an x-ray imaging system, comprising:generating x-rays of a 8.4 keV Lα-line from a tungsten x-ray source;directing the x-rays at integrated circuits with copper structures on a silicon substrate; andforming an image of the copper structures on a detector using the x-rays. 2. An x-ray imaging method as claimed in claim 1, further comprising:using a monochromator that selects the 8.4 keV energy; andusing a detector for detecting the 8.4 keV energy from the monochromator and a sample comprising the integrated circuits; andplacing a zone plate objective, between the sample and the detector, for focusing the 8.4 keV energy to form an image of the copper structures in the sample on the detector. 3. An x-ray imaging method as claimed in claim 2, wherein the monochromator is a crystal monochromator to select the 8.4 keV energy. 4. An x-ray imaging method as claimed in claim 2, wherein the monochromator is a multilayer monochromator to select the 8.4 keV energy. 5. An x-ray imaging method as claimed in claim 2, wherein the monochromator is a metal film energy filter to select the 8.4 keV energy. 6. An x-ray imaging method as claimed in claim 5, further comprising a thin scintillator further providing selectivity for the 8.4 keV energy. 7. An x-ray imaging method as claimed in claim 1, further comprising imaging structures in phase contrast. 8. An x-ray imaging method as claimed in claim 1, further comprising imaging structures in absorption contrast. 9. An imaging method for an x-ray imaging system, comprising:generating x-rays of a 8.4 keV Lα-line from a tungsten x-ray source;directing the x-rays at integrated circuits with copper structures and a dielectric substrate; andforming an image of the copper structures on a detector using the x-rays in phase or absorption contrast.