UVvåglängdsregioner

UVvåglängdsregioner refers to the electromagnetic spectrum within the ultraviolet range. This region is typically divided into three sub-regions based on wavelength: the ultraviolet C (UVC) from 100 to 280 nanometers, the ultraviolet B (UVB) from 280 to 315 nanometers, and the ultraviolet A (UVA) from 315 to 400 nanometers.

UVC radiation is almost entirely absorbed by the Earth's atmosphere, specifically the ozone layer, and therefore poses little threat to life on the surface. However, it is highly germicidal and is used in sterilization applications. UVB radiation can penetrate the atmosphere and is responsible for sunburn and vitamin D production in humans. Excessive exposure to UVB is linked to skin cancer and premature aging. UVA radiation penetrates deeper into the skin than UVB and contributes to skin aging and wrinkling. It is also involved in the formation of free radicals that can damage DNA.

The ultraviolet spectrum is generated by various natural and artificial sources. The sun is the primary natural source of UV radiation. Artificial sources include tanning beds, germicidal lamps, and certain types of lasers. Understanding these wavelength regions is crucial in fields such as dermatology, environmental science, and materials science due to the distinct effects of each sub-region.