Ultraviolet radiation
Ultraviolet radiation (pronunciation: /ˌʌltrəˈvaɪlɪt ˌreɪdiˈeɪʃən/) is a type of electromagnetic radiation that originates from the sun and reaches Earth. It is also produced by certain artificial sources, such as tanning beds and black lights.
Etymology
The term "ultraviolet" means "beyond violet" (from Latin ultra, "beyond"), referring to the fact that ultraviolet light has a shorter wavelength and higher frequency than violet light in the visible light spectrum.
Types of Ultraviolet Radiation
Ultraviolet radiation is divided into three types based on wavelength: UVA, UVB, and UVC.
- UVA (long-wave) has the longest wavelength and least energy. It can cause skin aging and wrinkles.
- UVB (medium-wave) has more energy than UVA and can directly damage the DNA in skin cells, leading to most skin cancers.
- UVC (short-wave) has the most energy and can be harmful to all forms of life. However, it is completely absorbed by the Earth's atmosphere and does not reach the surface.
Health Effects
Exposure to ultraviolet radiation can have both beneficial and harmful effects on human health. It is responsible for the production of vitamin D in the skin, but excessive exposure can lead to skin cancer, cataracts, and other health problems.
Protection
Protection from ultraviolet radiation includes wearing sun-protective clothing, applying sunscreen, and avoiding the sun during peak hours.
Related Terms
External links
- Medical encyclopedia article on Ultraviolet radiation
- Wikipedia's article - Ultraviolet radiation
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