Patent Number: 
Section: claims

1. An X-ray microscope which includes a device for generating X-rays, a lens for forming an image of an object, and an X-ray detector for detecting an image of the object, the device for generating X-rays provided with:means for producing a fluid jet having a curvilinear cross-section,means for forming a focused radiation beam whose focus is situated on the fluid jet,said focused radiation beam comprising a beam of electrically charged particles,wherein the cross-section of the fluid jet in the direction of the focused beam is smaller than that in the direction transversely thereof. 2. An X-ray microscope as claimed in claim 1, wherein the beam of electrically charged particles comprises an electron beam. 3. An X-ray microscope as claimed in claim 1, wherein the fluid jet consists essentially of liquid oxygen or nitrogen. 4. An X-ray microscope as claimed in claim 1, wherein the means for producing a focused beam of electrically charged particles comprises an electron gun for a cathode ray tube, the X-ray microscope including a condenser lens disposed between the fluid jet and an object to be imaged by means of the X-ray microscope. 5. An electron microscope comprising means for producing a focused electron beam, a device for generating X-rays, a lens for forming an image of an object, and a detector for detecting the image of the object, said device for generating X-rays including:means for producing a fluid jet having a curvilinear cross-section, andmeans for directing the focus of the electron beam onto the fluid jet,wherein the cross-section of the fluid jet in the direction of the focused beam is smaller than that in the direction transversely thereof. 6. An electron microscope as claimed in claim 5 and including an X-ray microscope, said device for generating X-rays acting as the X-ray source for the X-ray microscope. 7. An electron microscope as claimed in claim 5, the electron microscope being a scanning electron microscope.