(1) comes from radio transmitting stations, such as radio and television transmitting stations and radar systems.
(2) From power frequency high-voltage power systems, such as high-voltage transmission and transformation lines and substations.
(3) Industrial, medical and scientific research equipment using electromagnetic energy, such as electronic instruments, medical equipment, laser photography equipment and office automation equipment.
(4) Household appliances from people's daily use, such as microwave ovens, refrigerators, air conditioners, electric blankets, televisions, video recorders, computers, mobile phones, etc.
Harm of electromagnetic radiation:
Although electromagnetic radiation is colorless, odorless and untouchable, it can penetrate many substances including human body. High-energy electromagnetic radiation has a great influence on human body, such as headache, palpitation, insomnia, memory loss, leukopenia, vision loss, and even the development of children. According to the statistics of China eugenics association, nearly1.2000 newborns born every year in China are defective. Experts point out that electromagnetic radiation is the most harmful factor causing baby defects. Other research results show that electromagnetic waves generated by microwave ovens may induce cataracts, lead to brain abnormalities and even reduce fertility.
According to the detailed data provided by the World Health Organization, the International Committee on Non-ionizing Radiation Protection and other authoritative departments, people such as financial and securities industry, radio and television industry, IT industry, electric power industry, communication industry, civil aviation industry, railway industry, medical industry with high-frequency physiotherapy equipment, scientific research industry with a large number of instruments and meters, industry with microwave electrical equipment, industry with quite popular modern office equipment, and human beings with modern life tools such as computers and mobile phones are identified as high-risk groups of electromagnetic radiation.
It can be seen that it is even worse to call electromagnetic radiation an "invisible killer".
Electromagnetic radiation protection:
The harm and protection of electromagnetic radiation have attracted great attention from all countries in the world. The United Nations Conference on the Human Environment explicitly requires all governments to strengthen the prevention and control of electromagnetic radiation pollution. China decided to carry out compulsory electromagnetic compatibility testing on six kinds of imported goods, including computers, monitors, printers, switching power supplies, televisions and stereos, from 1999 to 1. All unqualified products will be refused entry. The State Economic and Trade Commission and China Consumers Association have long stressed that electromagnetic radiation needs protection! At present, the main measures to prevent electromagnetic radiation are generally the following.
1, distance protection
According to the principle that the intensity of electromagnetic field decreases with the increase of distance in the propagation process, we can take the method of staying away from the radiation source, so that the working place is located at the place with the minimum radiation intensity and avoid working or staying in front of the radiation source. For example, when the mobile phone is connected or dialed out, the mobile phone should be as far away from the body as possible, and the human body should keep a certain distance from the antenna of the mobile phone when talking.
2. Combination of shielding protection and personal protection
When people can't stay away from electronic products and electromagnetic radiation environment, they can use effective methods to limit electromagnetic energy in a designated space to prevent it from spreading. On the other hand, people can also wear special protective clothing and glasses to strengthen the protection of their internal organs, genitourinary system and eyes. At present, experts from all over the world have developed a large number of electromagnetic protection products, such as protective wallpaper, protective transparent film, protective clothing, protective glasses, "tire protection" apron, mobile phone radiation shielding, computer display shielding, computer electromagnetic radiation shielding and so on. These products can play a very good protective role.
3. Strengthen exercise and eat reasonably.
Strengthening exercise and strengthening physical fitness can improve one's immunity. In addition, drinking more green tea and eating more foods rich in vitamin B, such as carrots, kelp, rape, cabbage, animal liver, etc., are also conducive to regulating the disorder of human electromagnetic fields and increasing the body's ability to resist electromagnetic radiation pollution.
It is true that electromagnetic radiation will cause discomfort or even serious harm to human body, but it does not mean that as long as there is electromagnetic radiation, people will be in great trouble. In fact, in today's society, each of us lives in electromagnetic radiation, such as making phone calls and watching TV, which will be exposed to certain electromagnetic radiation. Therefore, we should not turn pale because we choke on food and talk about radiation. As long as we correctly understand and take adequate protective measures, we can reduce the electromagnetic radiation to the lowest level that the human body can bear. People can not only fully enjoy the convenience brought by modern technology, but also maintain a healthy body and a happy mood. Why can't you have your cake and eat it?