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X

X-Ray

Electromagnetic radiation of very short wavelength, lying within the wavelength interval of 0.0 to 100 angstroms (between gamma rays and ultra-violate radiation). Also called "X-radiation", "Roentgen ray." (X-rays penetrate various thicknesses of all solids and they act upon photographic plates in the same manner as light. Secondary X-rays are produced whenever X-rays are absorbed by a substance; in the case of absorption by a gas, this results in ionization.)

Xenon

(Xe), gaseous element, discovered spectroscopically in 1898 by William Ramsay and M.W. Travers. It is a rare, colorless, odorless, tasteless Inert Gas used in certain photographic-flash lamps, in high-intensity arc lamps for motion-picture projection, in high-pressure arc lamps to produce ultraviolet light, and in numerous radiation-detection instruments.

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