Crystal monochromator
Device for selecting radiation wavelengths
![](http://upload.wikimedia.org/wikipedia/commons/thumb/d/d9/NeutronMonochromatorBNL.jpg/200px-NeutronMonochromatorBNL.jpg)
A crystal monochromator is a device in neutron and X-ray optics to select a defined wavelength of the radiation for further purpose on a dedicated instrument or beamline. It operates through the diffraction process according to Bragg's law.
Similar devices are called crystal analyzer for the examination of scattered radiation.
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