Solar and UV Radiation
Sunlight consists of visible light (400–700 nm), infrared radiation (>700 nm), and UV radiation. The quality (spectrum) and quantity (intensity) of sunlight are modified during its passage through the atmosphere. Solar UV radiation at ground level represents about 5 % of the total solar energy; the radiation spectrum is between 290 and 400 nm and is comprised of approximately 95 % UVA and 5 % UVB; UVC is completely filtered out by the Earth’s atmosphere.
The spectrum of solar UV radiation to which an individual may be exposed varies with latitude, altitude, ground reflectance, season, time of day, weather, stratospheric ozone, and other atmospheric components such as air pollution. For most individuals, solar radiation is the major source of exposure to UV radiation. Sunbeds and sunlamps used for tanning purposes are the main source of deliberate exposure to artificial UV radiation.
Cancers of the Skin
Skin cancer (see skin...
KeywordsSquamous Cell Carcinoma Skin Cancer Actinic Keratosis Indoor Tanning Nonmelanoma Skin Cancer
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