Wavelength dispersive X-ray spectroscopy
From Biocrawler, the free encyclopedia.
The Wavelength dispersive X-ray spectroscopy is a method used to determine the energy spectrum of a X-ray radiation. It is mainly used in chemical analysis, in a X-ray fluorescence spectrometer, or in an electron microprobe (Castaing probe).
The X-rays emitted by the analysed object are collimated by parallel copper blades (called collimator or Soller slits), and irradiate a known single crystal. The single crystal diffracts the photons (Bragg's law) and are collected by a detector, usually a scintillation counter or a proportional counter.
The single crystal and the detector are mounted on a goniometer, the device is similar to a traditional X-ray diffractometer, except it is usually under vacuum, to reduce the absorption of soft radiation (low-energy photons) by the air and thus increase the sensitivity for the detection and quantitation of light elements (between boron and oxygen).
See also
External Links
- The Science of Spectroscopy (http://www.scienceofspectroscopy.info) - supported by NASA, includes OpenSpectrum, a Wiki-based learning tool for spectroscopy that anyone can edit
- Parallax Research Inc. (http://www.parallax-x-ray.com/) - Suppliers of High Resolution WDS Systems for Light Element and Transition Element Microanalysis
fr:analyse dispersive en longueur d'onde
