ultraviolet

Region of the electromagnetic spectrum extending from about $100 nm$ to $400 nm$ . This region is divided into four sub-bands as follows:

Vacuum Ultraviolet (VUV)	$100 nm$ – $200 nm$
UV-C	$200 nm$ – $280 nm$
UV-B	$280 nm$ – $315 nm$
UV-A	$315 nm$ – $400 nm$ .

Note:

The notation and the limits of the various regions are as recommended by the International Commission on Illumination (CIE), with the exception that in these recommendations the UV-C range is $100 nm$ – $280 nm$ , including thus the vacuum UV range.

Source:

PAC, 2007, 79, 293 (Glossary of terms used in photochemistry, 3rd edition (IUPAC Recommendations 2006)) on page 437

ultraviolet

Acronym: UV