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UV itself can be subdivided into near UV (380-200 nm
wavelength) and extreme or vacuum UV (200-10 nm). When considering
the effects of UV radiation on human health and the environment, the
range of UV wavelengths is often subdivided into UV-A (380-315 nm)[also
called Long Wave or "blacklight"], UV-B (315-280 nm)[also
called Medium Wave], and UV-C (280-10 nm)[also called Short Wave or
"germicidal"]. Unshielded exposure of the skin or eyes to
mercury arc lamps that do not have a conversion phosphor is quite
dangerous.
The offered phosphors convert the ultraviolet radiation
of mercury discharge of UV-C range (253,7 nm) into longer wavelength
range UV-A. Such converted UV-light is applicable in medicine for
phototherapy of skin diseases (in particular, psoriasis), in cosmetics
for artificial sunburn, in photocopy equipment, for photopolymerization,
UV-hardening, metal defectoscopy, for cheking up banknotes, for creating
decorative-advertising effects in illumination and many other purposes.
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