| Wavelength Dispersive X-ray Spectroscopy |
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EXPLANATION 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 ) which are collected by a detector, usually a Scintillation Counter or a Proportional Counter . The single crystal and the detector are mounted on a Goniometer which is a device similar to a traditional X-ray Diffractometer . It is usually operated 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 ). Modern systems contain a number of crystals of known but differing properties, with automated changing of the crystal depending on the energy range being analysed, enabling a wide range of energies to be analysed. SEE ALSO EXTERNAL LINKS
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