A device used in proton therapy to narrow the beam of particles being delivered to cancerous tissue. For details see the Proton Therapy page.

A device that renders divergent or convergent rays more nearly parallel. Note: The degree of collimation (parallelism) should be stated.

(also called Collimating Lens) A lens whose function it is to make rays of light parallel.

(physics) An optical device that generates a parallel beam of light (astronomy) A small telescope attached to a larger one, used to point it in the correct general direction

According to 10 CFR 34.3 [Title 10 – Energy; Chapter I -- Nuclear Regulatory Commission; Part 34 -- Licenses for Industrial Radiography and Radiation Safety; Requirements for Industrial Radiographic O [..]

(n) a small telescope attached to a large telescope to use in setting the line of the larger one(n) optical device consisting of a tube containing a convex achromatic lens at one end and a slit at the [..]

A device that produces a parallel beam of radiation. This is either done by refraction (as with light), bending the rays until they are parallel using a system of lenses or (as with gamma rays) by abs [..]

A device for limiting the effects of beam spread.

An optical device, mounted to the muzzle of a rifle via a bore-sized mandrel, the purpose of which is to allow a reasonable approximation of correct sight adjustment before actually firing live ammuni [..]

(physics) An optical device that generates a parallel beam of light. Often used to compensate for laser beam divergence. (physics) A similar device that produces a parallel beam of particles such [..]