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Ultraviolet radiation lies between visible light and X-rays along the electromagnetic spectrum. UV "light" spans a range of wavelengths between about 10 and 400 nanometers. The wavelength of violet light is around 400 nanometers (or 4,000 Å). Ultraviolet radiation oscillates at rates between about 800 terahertz (THz or 10 12 hertz) and 30,000 ...
16 de oct. de 2017 · Sunburn. High doses of UV radiation kill most of the skin cells in the upper skin layer, and cells that are not killed get damaged. In its mildest form, sunburn consists of a reddening of the skin called erythema. This appears shortly after UV radiation exposure and reaches a maximum intensity between 8 and 24 hours.
15 de sept. de 2017 · Tanning is the body's natural shield against uv rays.(Image credit: Stock.Xchng.) Ultraviolet light is a type of electromagnetic radiation that makes black-light posters glow, and is responsible ...
Radiation at the longer UV wavelengths of 320-400 nm, called UV-A, plays a helpful and essential role in formation of Vitamin D by the skin, and plays a harmful role in that it causes sunburn on human skin and cataracts in our eyes. The incoming radiation at shorter wavelengths, 290-320 nm, falls within the UV-B part of the electromagnetic ...
22 de jun. de 2022 · 紫外线辐射的急性影响包括DNA损伤、晒伤、光毒性和光过敏反应以及免疫系统抑制。. 免疫抑制可被视为癌症的一个危险因素，可能会再度激活病毒（例如唇疱疹）。. 暴露于紫外线辐射对皮肤和嘴唇的长期影响包括：. 皮肤黑色素瘤：一种危及生命的恶性皮肤癌 ...
Ultraviolet (UV) radiation is necessary because it provides vitamin D to help you survive, but it’s also harmful with overexposure. You can take care of your skin and prevent skin cancer from ultraviolet radiation by wearing sunscreen outdoors and staying out of the sun when it’s at its brightest in the middle of the day.
Acute effects of UV radiation exposure include photokeratitis and photoconjunctivitis. These inflammatory reactions are comparable to a sunburn of the very sensitive skin-like tissues of the eyeball and eyelids, and usually appear within a few hours of exposure. Both can be very painful, but are reversible and do not result in any long-term ...
