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List of terms beginning with Ul

Ultrasound (Ultrasound Scan, Ultrasound Scans)

Scan using sound waves to build up a picture of the inside of the body. A gel is put on the skin and a microphone passed back and forth over the area to be scanned. A computer converts the reflected sound waves into a picture on a screen.

Ultraviolet radiation

Ultraviolet light is light that we cannot see as it has a wave length shorter than the visible light we can see. But is an important part of sunlight. Ultraviolet light is divided into UVA, UVB and UVC. UVC has the shortest wavelength and cannot get through the ozone layer to reach us. But UVA and UVB have both been linked to skin cancer, including malignant melanoma.

Updated: 29 July 2009