Is the harm of electromagnetic radiation really so sensational?
In fact, human beings have been living in an electromagnetic environment. The earth itself is a large magnetic field, and both thermal radiation and lightning on its surface can produce electromagnetic radiation. In addition, the sun and other planets constantly produce electromagnetic radiation from outer space. However, naturally generated electromagnetic radiation is harmless to human body, while artificially generated electromagnetic radiation poses a threat to human body and pollutes the environment.
As early as 168 years ago, Faraday, an Englishman, discovered a wonderful phenomenon: electric field and magnetic field can be generated when current passes through a medium, which is later called electromagnetic induction. In 1980s, people built the first power station in the world by using the principle of electromagnetic induction. Since then, mankind has entered the application era of electromagnetic radiation.
From the first global communication of 190 1 to the large-scale use of mobile communication, as well as the necessary color TV sets and refrigerators, the application of electromagnetic radiation has penetrated into all aspects of human life. While people fully enjoy the convenience and comfort brought by electromagnetic radiation, they also feel its negative effects more and more. For example, electromagnetic radiation in electromagnetic compatibility has caused the navigation system, medical information system, industrial process control system and information transmission system to be out of control, which has interfered with people's listening to radio and television. ...
It is said that as long as household appliances, electronic equipment, mobile communication equipment and other electrical equipment are in operation and use, there will be electromagnetic radiation around them. It is also heard that electromagnetic radiation can penetrate many substances, including the human body. So some people compare the pollution caused by electromagnetic radiation of products to "invisible killer", so how much harm will electromagnetic radiation do to human health?
The reporter interviewed Zhao Yufeng, a professor at Beijing Institute of Labor Protection Science.
Professor Zhao said: "Electromagnetic radiation and electromagnetic pollution are two concepts. Although electromagnetic radiation is everywhere, electromagnetic pollution will have a negative impact on the human body only after the electromagnetic radiation exceeds a certain intensity (that is, the limit of safety and health standards), leading to headache, insomnia, memory loss, blood pressure rising or falling, and critical abnormalities in the heart. If you work in an environment with excessive electromagnetic radiation for a long time, it may seriously lead to abortion, cataracts and even cancer in some people ... "
Zhao Yufeng said frankly that the influence of electromagnetic radiation on people is universal, but not terrible. Different people or the same person have different tolerance to electromagnetic radiation at different ages. Even in an environment that exceeds the standard, it does not mean that everyone will get sick, so there is no need to be "scared" about electromagnetic radiation. Of course, preventive measures should also be taken for the elderly, children, pregnant women or patients with pacemakers, people who are sensitive to electromagnetic radiation, and people who work in an environment where electromagnetic radiation exceeds the standard for a long time.
In view of the fact that the electromagnetic radiation generated by contact with electrical products in daily life may be harmful to health, the China Consumers Association issued a warning on August 6 that electromagnetic radiation must be prevented in life. Experts remind consumers:
● Don't use household appliances too intensively or often together to avoid exposing yourself to the danger of excessive radiation. In particular, televisions, computers and refrigerators should not be concentrated in the bedroom.
● Various household appliances, office equipment, mobile phones, etc. Should be avoided for a long time. When electrical appliances, such as televisions and computers, need to be used for a long time, attention should be paid to leaving every hour, and the way of looking far away or closing your eyes should be adopted to reduce the fatigue of eyes and the influence of radiation.
● When the electrical appliance is suspended, it is best not to let it stand idly by, because it can generate weak electromagnetic field at this time and radiation accumulation for a long time.
● Keep a safe distance when using various electrical appliances. For example, the distance from the eyes to the TV screen is generally about 5 times the width of the screen; Leave one meter away after the microwave oven is turned on, and pregnant women and children should stay away from the microwave oven as far as possible; When using a mobile phone, the distance between the head and the antenna of the mobile phone should be as far as possible, and it is best to use a separate earphone and microphone to answer the phone.
● People living and working near high-voltage lines, radar stations, TV stations and electromagnetic wave transmission towers, patients wearing pacemakers and people living in modern electrical automation environment, especially pregnant women, children and the elderly with weak resistance, should be equipped with shielding protective clothing to block electromagnetic radiation if possible.
● TV, computer and other electrical equipment with display screen can be equipped with electromagnetic radiation protection screen, and users can also wear radiation protection glasses. The radiation generated by the display screen may cause dry skin, accelerate skin aging and even lead to skin cancer, so wash your face in time after use.
● The electromagnetic radiation released at the moment when the mobile phone is switched on is the largest. So it's best to ring the phone for a second or two or the phone rings twice before answering the phone.
● Eat foods rich in vitamins A, C and protein, such as carrots, tomatoes, kelp, lean meat, animal liver, etc., to strengthen the body's ability to resist electromagnetic radiation.
"In fact, whether electromagnetic radiation has an impact on human health is not a new problem." Li Tianlin, a researcher at the Chinese Academy of Preventive Medicine, told the reporter, "For half a century, experts and scholars at home and abroad have been studying and commenting on electromagnetic radiation. However, due to the inconsistency of research objectives, methods and conditions (the distance, time and biological model of exposure to electromagnetic radiation sources are different), the research results and opinions of relevant experts and scholars around the world on the biological effects of electromagnetic radiation are not consistent at present. Therefore, what impact and harm electromagnetic radiation has on the human body needs further discussion. "
However, Li Tianlin believes that China, as a big country, the relevant authorities should formulate a unified national mandatory national standard for electromagnetic radiation safety and health as soon as possible. So that manufacturers can follow this standard to develop ultra-low electromagnetic radiation electrical equipment and ensure the safety of consumers. At the same time, the management of electromagnetic radiation will be included in the normal social environmental protection scope, and the legitimate rights and interests of consumers and workers will be effectively protected.
The reporter interviewed a number of relevant departments on the formulation of electromagnetic radiation standards, and learned that in the past, the Ministry of Health, the Ministry of Electronics Industry (now merged into the Ministry of Information Industry), the State Environmental Protection Administration, the military and other departments all formulated their own electromagnetic radiation safety standards, but there was no unified compulsory national standard for electromagnetic radiation safety. It is reported that at present, China is working on the formulation of mandatory national standards for electromagnetic radiation, which is expected to be introduced before the end of this year.
According to experts from the State Environmental Protection Administration, the electromagnetic radiation environment in China is relatively good at present, which is equivalent to the water pollution and air pollution faced by China in the 1950s and 1960s. There are signs of emergence, far from serious. But from now on, we must strictly manage and plan ahead. Because social and economic development is inseparable from the application of electromagnetic radiation. If the environment cannot withstand electromagnetic pollution, it will be difficult for the economy to develop further.