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ultraviolet radiation Dictionary Terms

optical transition
The process by which an atomic system changes from one energy level to another by either the emission or absorption of...
phosphor
A chemical substance that exhibits fluorescence when excited by ultraviolet radiation, x-rays or an electron beam. The...
enclosed arc lamp
An arc lamp whose carbon electrodes are enclosed in a transparent chamber, resulting in an arc that is steadier, lasts...
deuterium discharge lamp
A discharge lamp filled with deuterium to produce high-intensity ultraviolet radiation for use in spectroscopic analysis.
reflected ultraviolet photography
A photographic method used to obtain an image of a subject by means of its reflectance of incident ultraviolet radiation. An...
cobalt glass
Glass that transmits near-ultraviolet radiation but is opaque in the visible region. Also known as woods glass.
Ultraviolet-C
Ultraviolet-C (UV-C) refers to a specific range of ultraviolet radiation with shorter wavelengths than those of visible...
Gudden-Pohl effect
The light flash that occurs when an electrical field is applied to a phosphor already excited by ultraviolet radiation.
ultraviolet lens
A microscope used either to detect selective absorption of various wavelengths by the specimen or to achieve increased...
Lyman-alpha radiation
The hydrogen-derived, ultraviolet radiation running from 1216 to 512 A, discovered by Theodore Lyman in 1914.
fluorescence photography
The photographic recording of a subject that exhibits luminescence only for an extremely short time (10-8 s) after the...
wood effect
The phenomenon in which alkali metals are transparent to ultraviolet radiation.
ultraviolet photomicrography
The photographic recording that uses ultraviolet radiation to irradiate the microscope sample being examined and to form an...
Hertz effect
The ionization and spark emission due to exposure to ultraviolet radiation.
uviol glass
A type of glass contrived by Schott that is highly transparent to ultraviolet radiation.
vacuum ultraviolet detector
A device that serves to detect the presence of vacuum ultraviolet radiation. It may be photographic film, a thermopile, ion...
vacuum ultraviolet radiation
Radiation whose spectrum runs between 100 and 300 nm. Any work with these wavelengths requires evacuated equipment.
glass dosimeter
A device that detects and measures the quantity of exposure to nuclear radiation. It uses a special glass rod that...
ultraviolet reflectance
Ultraviolet reflectance refers to the ability of a material or surface to reflect UV light. Ultraviolet light is...
xerography
A printing process of electrostatic electrophotography that uses a photoconductive insulating medium, in conjunction with...
ultraviolet lens
A lens intended for use with wavelengths shorter than about 380 nm. It must be made of quartz, calcium fluoride, lithium...
fluorite
The optical form of the crystal fluorspar, calcium fluoride, that is utilized for its low optical dispersion, its low...
actinic glass
Glass designed to absorb most infrared and ultraviolet radiation while transmitting most of the visible region.
ultraviolet lamp
A type of lamp that emits a high quantity of ultraviolet radiation. This may be an arc lamp encased in a bulb of a glass...
far-ultraviolet radiation
That radiation characterized by wavelengths ranging from 0.2 to 0.3 µm in the electromagnetic spectrum.
solarization
1. The reduction in the developable density of a photographic emulsion that has been extremely overexposed. 2. In a laser...
ultraviolet photoemission spectroscopy
A technique for measuring the energy spectrum of electrons emitted during the absorption of ultraviolet radiation. This...
photochemical
The term photochemical pertains to chemical processes or reactions that are initiated or influenced by the absorption of...

(28 results found)

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