Patent ID: 6823042
Filing Date: 2004-11-23
Classification: G01N

Abstract:
Apparatus for X-ray analysis having an X-ray source generating an X-ray beam which is reflected by monochromator means and is to be incident on a sample, characterized in that:(a) said X-ray source is a rotating target X-ray tube having a rotating target which has an effective focal spot size of 40 to 100 micrometers, (b) said monochromator means is a composite monochromator having a first elliptic monochromator and a second elliptic monochromator joined with each other side by side, (c) each of said elliptic monochromators has a first focal point at which an X-ray focal spot on said target is disposed and a second focal point at which said sample is to be disposed, (d) each of said elliptic monochromators has a reflection surface made of a synthetic multilayered thin film in which layer boundaries, which contribute to diffraction, are parallel to said reflection surface and d-spacing varies continuously along an elliptic-arc so as to satisfy a Bragg's equation for X-rays with a predetermined wavelength at any point of said reflection surface, and (e) a shortest distance between said X-ray focal spot on said target and said composite monochromator is 40 to 100 mm.