Ultraviolet light — electromagnetic non-ionizing radiation in the range of 100 to 400 nm. 100 nm — the boundary beyond which lies a range of ionizing radiation. The main natural source of UV sunlight. Passing through the atmosphere 3emli, solar radiation loses the most dangerous part of his whole shortwave spectrum (100-289 nm) and a large part of the middle range (280-3. 15 nm) due to its absorption by molecules of oxygen, ozone, water, and carbon dioxide.
Experts of the World Organization of Health (B03) are concerned decrease in stratospheric ozone, as it leads to desc UV exposure of the population of the planet. The United Nations Environment Programme (United Nations Environmental Programm UNEP) will annually fix the world's more than 2 million cases of skin cancer and about 200 thousand melanumnyh skin cancer. Calculations have shown that the reduction of contents of stratospheric ozone by 10% will cause additional appearance in the world of 300 thousand patients with non-melanoma skin cancers and 4. 5 thousand melanoma.
About 16 million people worldwide lose their vision because of cataracts, and 20% of those exposed to UV. Experts believe that the number of cataracts caused by solar UV to increase by 0.5% in the fall of ozone in the stratosphere at 1%.
Studies have also shown that natural UV weakens the immune response to both rodents and humans. This suppression of the immune response causes increased susceptibility to infectious diseases of the skin and some systemic infections.
In 1994, WHO released the most comprehensive monograph to date with who took all the scientific literature on the UV. This book has become a scientific basis for the international project INTERSUN (Iptegpatyupal op Project Health, Solar UV and Environmental Change), one hundred vyaschego to fighting disease, you Bells of UV. The project brings together experts, WHO, UNEP, the International Agency for Research on Cancer (International Agency for Researcll Sapseg op), the International Commission on Non-Ionizing Radiation (International Sommissiop op Nonionizing Radiation Protection) and other national and international organizations.
The main task of a quantitative INTERSUN the dependence of human health from the effects of solar radiation and to develop measures to protect it from increasing levels of UV.
Among the documents published under the auspices INTERSUN, Xia is relating to the protection from UV radiation (including radiation dosimetry eyes), reports the daily contents of UV (sunlight World index), which may be included in weather reports or news of the day. Development INTERSUN already formed the basis of two major epidemiological studies: determining the effect of UV irradiation on the effectiveness of vaccination of children against measles and rubella vaccination of adults traveling to tropical areas, hepatitis B
Category: People, psychology, health