2016年3月9日 · 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 wavelength range 100-400 nm and is divided into three bands: UVA (315-400 nm) UVB (280-315 nm) UVC (100-280 nm). Short-wavelength UVC is the most damaging type of UV radiation.

2022年6月21日 · 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 cataracts; of these, some 10% may be due to exposure to UVR. Vitamin D production. UVR in small amounts is essential to good health as it leads to the production of vitamin D in the body.

2024年7月30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.

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 measures. As part of an international effort, the UV index was developed by WHO, the United Nations Environment Programme, the World Meteorological Organization and the ...

2024年7月16日 · 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 by how strong their energy is, with UV-A rays having a lower amount of energy. UV-A and UV-B can therefore trigger different biological and health effects. The skin

Natural UV radiation levels depend on sun elevation, latitude and altitude, cloud cover and ground reflection. More than 60 000 skin melanoma-related deaths were estimated to be caused by solar UV radiation in the year 2000. Exposures can occur through UV radiation from the sun, but also from sunbeds and other artificial tanning devices.

2017年10月16日 · Within some countries there is a clear relationship between increasing incidence of non-melanoma skin cancers with decreasing latitude, i.e. higher UV radiation levels. Malignant melanoma Since the early 1970s, malignant melanoma incidence has increased significantly, for example an average 4 per cent every year in the United States.

2022年6月21日 · A new app for mobile phones that provides localized information on ultraviolet (UV) radiation levels has been launched by the World Health Organization (WHO), the World Meteorological Organization (WMO), the United Nations Environment Programme (UNEP) and the International Labour Organization (ILO). The SunSmart Global UV app provides five-day …

2024年7月16日 · UV damage is mostly avoidable. The rise in the incidence of skin cancers over the past decades is strongly related to occupational and recreational UV exposure. Overexposure to UV radiation is recognized as the underlying cause for harmful effects on the skin, eye, and the immune system.

2002年6月13日 · 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 damage. It serves as an important vehicle to raise public awareness and to alert people about the need to adopt protective measures when exposed to UV radiation.