ultraviolet rays

I should note here that the tanning bed is quite a pleasurable experience—the ultraviolet rays release endorphins under the skin.

The difficulty is a real one since the ultraviolet rays have a destructive effect even in the absence of oxygen.

The apparatus is not one for producing violet or ultraviolet rays in the scientific meaning of those words.

In most of the vats vegetation grew in various stages, greening under the ultraviolet rays that radiated from the low roof.

The ultraviolet rays falling upon this screen were transformed into visible rays by the phenomenon of fluorescence.