Neutron, X-ray and Gamma Ray Collimators
In neutron, X-ray and gamma ray optics, a collimator is a device that filters a stream of rays so that only those traveling parallel to a specified direction are allowed through. Collimators are used in neutron, X-ray, and gamma-ray optics because it is not yet possible to focus radiation with such short wavelengths into an image through the use of lenses as is routine with electromagnetic radiation at optical or near-optical wavelengths. Collimators are also used with radiation detectors in nuclear power stations for monitoring sources of radioactivity.
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“Our reason may prove what it will: our reason is only a feeble ray that has issued from Nature.”
—Maurice Maeterlinck (1862–1949)