Ultraviolet
From HvWiki
Ultraviolet (UV) radiation is electromagnetic radiation of a wavelength shorter than that of the visible region, but longer than that of X-rays. Note that there is some overlap between extreme UV and soft X-rays.
Ultraviolet radiation can be subdivided into:
- Near UV (380–200 nm)
- Far or vacuum UV (200–10 nm) (FUV or VUV)
- Extreme UV (1–31 nm) (EUV or XUV)
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Safety
- Shortwave ultraviolet light photolyzes molecular oxygen to produce ozone.
- It is recommended by the U.S. National Institute for Occupational Safety and Health (NIOSH) that the total intensity from 315 to 400 nm hitting unprotected skin should not exceed 10 W/m2 for periods longer than 1000 seconds. For shorter exposure times, the energy density should not exceed 104 J/m2.
- Threshold Limit Values for occupational exposure to ultraviolet radiation in an 8 hour period. These values for exposure of the eye or the skin apply to UV radiation from arcs, gas and vapor discharges, fluorescent and incandescent sources, and solar radiation, but they do not apply to UV lasers.
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