Arrangement for measuring the pulse transfer spectrum of elastically scattered X-ray quanta

Claim 1

An arrangement for measuring the pulse transfer spectrum of elastically scattered X-ray quanta from an examination zone, comprising an X-ray source for generating polychromatic X-rays, a detector which detects the scattered X-ray quanta and which comprises a plurality of annular detector elements which concentrically enclose a detector centre in a detector plane, a primary diaphragm device which is arranged between the X-ray source and the examination zone irradiated by the X-rays and which comprises a primary slit aperture for forming a primary radiation beam, a secondary diaphragm device which is arranged between the examination zone and the detector and which comprises at least one secondary slit aperture, the primary and secondary slit apertures having essentially a semi-annular shape and being arranged coaxially with respect to a beam axis connecting the X-ray source and the detector centre, characterized in that there is provided a second X-ray source which is situated at substantially the same distance from the detector plane as the first X-ray source and is arranged in such a manner that a second beam axis which connects the second X-ray source and the detector centre intersects said first beam axis at an angle and constitutes a pair of beam axes in conjunction therewith, that with both beam axes there are associated primary and secondary slit apertures, and that all primary and secondary slit apertures extending around the first beam axis open towards the plane defined by the pair of beam axes in the opposite direction in comparison with the primary and secondary slit apertures extending around the second beam axis, both ends of each semi-annular slit aperture being situated approximately in the plane defined by the pair of beam axes.