Radiation: Ultraviolet (UV) radiation - World Health Organization …
Mar 9, 2016 · The shorter the wavelength, the more harmful the UV radiation. However, shorter wavelength UV radiation is less able to penetrate the skin. The UV region covers the …
Radiation: The ultraviolet (UV) index - World Health Organization …
Jun 20, 2022 · The UV Index is an important vehicle to raise public awareness of the risks of excessive exposure to UV radiation, and to alert people about the need to adopt protective …
Ultraviolet radiation - World Health Organization (WHO)
Jun 12, 2025 · 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 …
Ultraviolet radiation - World Health Organization (WHO)
Jun 21, 2022 · UV exposure may also be involved in the development of age-related macular degeneration (AMD). Worldwide, it is estimated that 15 million people are blind due to …
Radiation: The known health effects of ultraviolet radiation
Jul 16, 2024 · UV-A rays have longer wavelengths than UV-B rays, and thus penetrate deeper into the tissue layers of the eye and the skin. UV-A and UV-B rays also differ from each other …
辐射：紫外线辐射对健康的已知影响
uv-b可在几天内刺激产生新的黑色素，从而使晒黑效果能够持续相对较长时间。uv-b还刺激细胞产生更厚的表皮。因此，uv-b和uv-a一起导致外层细胞合成、变暗和变厚——这些反应是人体对 …
Ultraviolet (UV) radiation - World Health Organization (WHO)
The main factor that predisposes to the development of skin cancer is exposure to ultraviolet (UV) radiation, traditionally from the sun and more recently from artificial tanning sunbeds. Both …
Les effets connus des UV sur la santé - World Health Organization …
En outre, les UV-A dégagent moins d'énergie que les UV-B. Les UV-A et les UV-B peuvent donc avoir des effets différents sur le plan biologique et de la santé. La peau Les UV-A pénètrent …
Rayonnement ultraviolet - World Health Organization (WHO)
Jun 21, 2022 · 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 …
Global solar UV index : a practical guide - World Health …
Jun 13, 2002 · The Global Solar UV Index (UVI) described in this document is a simple measure of the UV radiation level at the Earth’s surface and an indicator of the potential for skin …