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X-ray optical projection microscope based on polycapillary Kumakhov optics

The X-ray projection microscope with the use of polycapillary optics is described. The focusing Kumakhov lens with a focus size of 1 50 m and an energy-dispersive Si-detector allow local analysis of chemical elements concentrations and distributuions. The same lens can be used for local radiation procession with a dose rate up to 10 Gy/s. Digital projections are recorded by the 1300x1030 detecting array with a pixel size of 6.7 μm. The radiation spectrum can be strongly modulated by changing X-ray source voltage, rotation the filter cassette, and by placing in the incident beam the polycapillary half-lens. Conditions for enhancing image contrast by the digital subtraction of X-ray projections registered at different spectrum distributions in the energy range of 5-25 keV are considered. It is shown that when an object is irradiated by polychromatic radiation, the use of a Ni filter and a NiCl2 contrast solution provides results that were previously obtained by subtracting images with monochromatic spectral lines near the K-jump of absorption in the contrast media. X-ray fluorescence spectra and contrast enhanced images of biological objects are presented.