ULTRA VIOLETNO (UV) ZRAČENJE, KAO NEGATIVNI INDEKS ZDRAVLJA
ULTRA-VIOLET (UV) RADIATION AS A NEGATIVE HEALTH INDEX

Summary/Abstract: Radiation whose origin is the Sun includes visible light, heat and UV radiation. UV radiation covers wavelenght area between 100- 400 nm and is divided in 3 groups:UVA(315-400nm9;uvb(280- 315nm);UVC(100-280nm). As Sun rays pass through the Earth's atmosphere, entire UVC and almost 90 percent of UVB radiation are absorbed by ozone, steam, oxygen and carbon dioxide. Earth's atmosphere has little effect on UVA rays, and because of this fact UV-rays that reach Earths surface contain large quantities of UVA and a smaller amount of UVB rays. Sun's radiation is an important natural factor because it creates Earth's climate and has a significant influence on the entire environment. Ultra-violet part of the Sun's spectre has a very important role in numerous processes in biosphere. UV radiation has several useful effects, but it can also be very hazardous if it transcends defined safety levels. If the amount of UV rays is high enough, self protection ability of certain biological entities becomes weakened and thus these organisms can be severely damaged. This also relates to human organism, especially to the hair and the eyes.

• Details
• Contents