Ultraviolet radiation

Ultraviolet radiation is electromagnetic radiation with wavelengths ranging from 10 to 400 nm, the emission and absorption of which is the individual quanta of energy. For medical purposes use ultraviolet light with wavelengths from 180 to 400 nm and a separate area of the ultraviolet spectrum: A (315-400 nm), (280 - 315 nm) and (180-280 nm) or long-wave ultraviolet rays - Def (280-400 nm) and shortwave - KOF (180-280 nm).
Under the influence of long-wave ultraviolet rays normalized and phosphorus metabolism, they contribute to the formation of ergosterol of vitamin D in the skin; these rays are widely used in ultraviolet insufficiency (see, for exposure of pregnant women, weak, sick rickets in children, convalescents. KOF-rays have bactericidal action mainly due to the violation of vital activity of microorganisms due to photochemical decomposition of the protein complexes. These rays are used in hygienic practice for disinfection of water, air, household items and other
When exposed to ultraviolet rays by photochemical processes in the skin form of biologically active substances that cause local reactions of redness - erythema (from the long-wave ultraviolet rays of bright red arising later and continued over a long time; from KOF-ray - cyanotic, before developing and passing faster). In addition, these substances are due to irritation of the skin receptors (nervous mechanism) or enters the blood and lymph (neurohumoral mechanism) have a General effect. This effect is manifested in increased resistance to infections, normalization of metabolic processes and functional status of the sympathoadrenal system, as well as in desensitization and reduce pain sensitivity.
There are natural (Sun) and artificial sources of UV radiation. The sun is the most powerful source of ultraviolet radiation (see Heliotherapy). The artificial sources of UV radiation - mercury-quartz, erythema and bactericidal uviol lamp (see ultraviolet Irradiators).
Indications and contraindications to their use - see the Light.