Indoor Tanning in Norway - Statens strålevern

Appendix C- Glossary
UV – Ultraviolet (UV) radiation is the non–ionizing part of the electromagnetic spectrum and ranges
between 100 nm and 400 nm.
UVA – is UV radiation from 315 nm to 400 nm.
UVB – is UV radiation from 280 to 315 nm.
UVC – is UV radiation from 100 nm to 280 nm.
Short wave irradiance – is the UV wavelength region from 250 to 320 nm.
Long wave irradiance – is the UV wavelength region from 320 to 400 nm.
Effective irradiance – is a quantity of electromagnetic radiation which is weighted according to a
specified action spectrum.
Action spectrum – is the rate of a physiological activity plotted against wavelength. It shows which
wavelength is most effective to induce a specific reaction.
ACGIH - is the American Conference on Governmental Industrial Hygienists. The ACGIH-weighting
function is a reference action spectrum for UV-induced acute erythema and photokeratitis in humans
which is valid for the wavelength range 200-315 nm (38), i.e. UVC and UVB.
CIE – is the Commission Internationale de l’Eclairage. The CIE-action spectrum is a reference action
spectrum for UV induced erythema in Caucasian human skin (39) valid for the UV region from 250 to
400 nm.
UV index (UVI) – is the total CIE-weighted irradiance multiplied with 40 m²/W (42).
UV irradiance – is the power of UV radiation onto a unit surface area, given in W/m².
UV dose – is the energy of UV radiation a person receives per unit area and over the time of exposure,
given in J/m².
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