Ultraviolet radiation (UV) domain the wave is in the range of electromagnetic waves with the amplitude during the wave is shorter than visible light, but longer than the beam X.

this radiation can be based on the amount of influence, sub-groups, the division will:

NUV-near ultraviolet with wavelength of 400-200 nm, (apparently low risk for the health of the environment)

VUV - VACUUM UV (risk dangerous)

XUV or EUV or XUV1-31nm )Extreme UV) (very harmful and destructive for the health of the environment)