Radiation: Ultraviolet (UV) radiation - World Health Organization …
2016年3月9日 · The sun is by far the strongest source of ultraviolet radiation in our environment. Solar emissions include visible light, heat and ultraviolet (UV) radiation. Just as visible light consists of different colours that become apparent in a rainbow, the UV radiation spectrum is divided into three regions called UVA, UVB and UVC.
Ultraviolet radiation - World Health Organization (WHO)
2022年6月21日 · Ultraviolet radiation (UVR) can neither be seen nor felt. While some people are exposed to artificial UVR sources (e.g. in medicine, industry and for disinfection and cosmetic purposes), everyone is exposed to solar UVR. Solar UVR levels are influenced by several factors: Sun elevation: the higher the sun in the sky, the higher the UVR level.
Ultraviolet radiation - World Health Organization (WHO)
2024年7月29日 · Ultraviolet (UV) radiation covers the wavelength range of 100–400 nm, which is a higher frequency and lower wavelength than visible light. UV radiation comes naturally from the sun, but it can also be created by artificial sources used in industry, commerce and recreation.
Radiation: The known health effects of ultraviolet radiation
2024年7月16日 · The most common form of sun allergy is polymorphic light dermatosis. Following exposure to UV, in particular to UVA, the skin may develop patchy reddening, blisters, and nodules (papules) with an intense itching sensation, typically affecting the neck, upper chest, upper arms, backs of the hands, or thighs.
Radiation: Ultraviolet (UV) radiation and skin cancer
2017年10月16日 · Effects of ultraviolet (UV) radiation on the skin, eye and the immune system. Radiation: The known health effects of ultraviolet radiation. Ultraviolet (UV) radiation. The ultraviolet (UV) index. Read more. Global solar UV index : a practical guide. Radiation and health. Ultraviolet radiation
Radiation: Effects of ultraviolet (UV) radiation on the skin, eyes and ...
2003年9月17日 · Bright light activates the constriction of the pupil and the squinting reflex to minimize the penetration of the sun’s rays into the eye. However, the effectiveness of these natural defences in protecting against the dangers of UV radiation is limited under extreme conditions such as sunbed use or strong ground reflection from sand, water and ...
Radiation: Ionizing radiation - World Health Organization (WHO)
Energy emitted from a source is generally referred to as radiation. Examples include heat or light from the sun, microwaves from an oven, X rays from an X-ray tube and gamma rays from radioactive elements. Ionizing radiation can remove electrons from the atoms, i.e. it …
Keeping safe from ultraviolet rays - World Health Organization …
2022年9月20日 · Keeping safe from ultraviolet rays . Updated: 20 September 2022. Back to all tips and information → ...
Radiation: The ultraviolet (UV) index - World Health Organization …
2022年6月20日 · Effects of ultraviolet (UV) radiation on the skin, eye and the immune system. Radiation: The known health effects of ultraviolet radiation. Ultraviolet (UV) radiation. Ultraviolet (UV) radiation and skin cancer. Read more. Global solar UV index : a practical guide. Radiation and health. Ultraviolet radiation
Raising awareness on ultraviolet radiation - World Health …
2024年7月29日 · Small amounts of ultraviolet (UV) radiation are essential to produce vitamin D in people, yet overexposure to sunlight may result in acute and chronic health effects on the skin, eye and immune system.The rise in the incidence of skin cancers over the past decades is strongly related to increasingly popular outdoor activities and recreational exposure. Experts …
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