Sites sur "Ultraviolet"

Rayonnement ultraviolet - World Health Organization (WHO) : Le rayonnement ultraviolet (UV) ne peut être ni vu ni ressenti. Alors que certaines personnes sont exposées à des sources artificielles de rayonnement UV (par exemple en médecine, dans l?industrie et à des fins de désinfection et cosmétiques), tout le monde est exposé aux rayons UV solaires. Les niveaux de rayonnement UV solaire ...
Radiation: Ultraviolet (UV) radiation - World Health Organization (WHO) : 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. As sunlight passes through the atmosphere, all UVC and most UVB is absorbed by ozone, water vapour, oxygen and carbon dioxide. UVA is not filtered as ...
Ultraviolet radiation - World Health Organization (WHO) : 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 ...
Rayonnement ultraviolet (UV) et cancer de la peau : L'incidence du mélanome et des autres cancers cutanés a augmenté au cours des dernières décennies. A l?heure actuelle, entre 2 et 3 millions de cancers cutanés non mélanocytaires et 132 000 mélanomes malins sont enregistrés chaque année dans le monde.
Rayonnement ultraviolet - World Health Organization (WHO) : Dans notre environnement, le soleil est de loin la source de rayonnement ultraviolet la plus importante. Le soleil émet de la lumière, de la chaleur et des rayons ultraviolets (UV). Exactement comme la lumière visible est composée de différentes couleurs visibles dans un arc-en-ciel, le spectre du rayonnement UV est divisé en trois ...
Ultraviolet radiation - World Health Organization (WHO) : 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.
Les effets connus des UV sur la santé - World Health Organization (WHO) : Les UV peuvent avoir des effets à court et à long terme sur la peau. En plus des effets à court terme bien connus, tels que les coups de soleil ou les réactions allergiques, les effets à long terme comme le cancer de la peau représentent un risque chronique pour la santé.
Raising awareness on ultraviolet radiation - World Health Organization ... : 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 believe that 4 out of 5 cases of ...
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Radiation: The known health effects of ultraviolet radiation : Current scientific evidence suggests that different forms of eye cancer may be associated with UV exposure. Uveal melanoma, the most frequent cancer of the eyeball, sometimes requires surgical removal and is associated with high mortality. Evidence of an association with ultraviolet exposure is mixed. Basal cell carcinoma, accounting for ...