At present, science cannot explain the relationship between long-term radiation exposure and cancer, nor can it provide relevant evidence. It is clear that the maximum power emitted by the antenna of the mobile signal transmitting station (base station) is 20 watts, and the emission frequency is 900 MHz (or 1800 MHz), which is generally in the order of milliwatts when reaching the human body; The maximum transmitting power of a mobile phone is 2 watts. When talking on a mobile phone, the radiation will be much greater than that of a base station.
There is radiation, but within the scope of national safety standards, it will not have any adverse effects on human body. The transmission towers of communication facilities are all approved by the local environmental protection bureau, and the power is very small, below 200mW, which is basically harmless to people.
Experts say that although the term electromagnetic radiation pollution is a bit strange, it is very common in our lives. Pollution sources that can cause electromagnetic radiation pollution are everywhere, such as TV towers, radar stations, communication transmitters, substations, high-voltage lines, computers, mobile phones, microwave ovens, induction cookers, and even the subway trains we take.
Experts tell us that some cities have TV towers, because the TV towers are hundreds of meters high, and the radiation area has exceeded the height of residential buildings, which will basically not affect the health of citizens. Some high-rise buildings have installed antennas, such as parabolic antennas, mobile phone base stations, paging station antennas, etc. These antennas have limited power and are controlled by the local radio management Committee, which has little impact on residents.
China Unicom, China Mobile, China Telecom and other signal transmission towers. The height of signal transmission towers is generally more than 45 meters, while the height of ordinary residential buildings is 7 floors, which is about 2 1 meter. The antenna height of the iron tower is much higher than that of the existing residence, which will not cause harm to people's health.
European and American countries have conducted a large number of surveys and statistical analysis, and the scale of each survey is different. There are thousands, tens of thousands, hundreds of thousands or even millions of people in a survey. The investigation site is in the wild, such as power lines, substations, subway stations and electric trains; Or in factories, laboratories, offices and homes. The investigation spans more than ten years or even decades.
A large number of survey results convincingly show that the occurrence probability of various tumor lesions in human body is closely related to low-frequency magnetic field radiation. Experts in many countries in Europe and America and some government agencies are convinced that low-frequency magnetic fields will significantly increase the incidence of the following diseases: leukocytosis and leukemia (especially more harmful to children), cancer, physical defects of newborns, breast cancer, brain tumors, malignant lymphoma, nervous system tumors, astrocyte development, chronic myeloid leukemia, chromosome aberration and so on. It has also been reported that the decreased secretion of some hormones under the electromagnetic field may also be the cause of breast tumors. Some investigation reports also pointed out that people who are exposed to electromagnetic radiation frequently have a greater risk of breast cancer if they are exposed to high temperature again.
Foreigners say:
Headache, insomnia, dizziness, memory loss and cancer are just some of the health complaints of residents living near the cell phone tower in Bordeaux.
Seven years ago, since the mobile phone tower in Bordeaux was built, the 49-year-old Anstaf family lived near the tower. Since then, there have been many health problems in this family, such as insomnia, persistent headache and dizziness. Both of their dogs were diagnosed with "tumors". In 2000, Anastacio was diagnosed with lymphocytosis and early leukemia. After numerous blood tests, the doctors could not give a reasonable explanation for his illness. After three months abroad, I got better for no reason.
Not far from this family, there is another family with the same health problems. Although the family lives far away from the tower, after testing, the radiation intensity where they live is much higher than that of the family's home. A family member said that he used 20 painkillers every week to relieve headaches that doctors could not explain. They often suffer from insomnia at night, especially on Friday and Saturday nights, because the transmission tower is the busiest in these two days. "We will feel particularly uncomfortable staying at home. Of course, we have given scientific proof, but we know that the problems must have appeared on the launch tower, because these problems began to appear when we moved here two years ago. When we moved here, all the symptoms disappeared automatically. " Whether cell phones and cell phone towers will cause health problems remains to be studied. Voda-com, the company that set up Bordeaux cell phone tower, clearly stated that the radiation intensity near the tower was lower than the recommended index of 667 times. This guiding index is the result of discussions between ICNIRP and WHO. It assumes that "non-ionizing" radiation has no physiological effect on human body except heating it. Although many studies show that cell phone signals can change brain wave patterns, ICNIRP insists that this is not a proof of "health threat", and many cell phone users complain that headaches are only "subjective" feelings.
In recent years, scientific research all over the world has pointed out the connection between low-intensity microwave radiation (similar to the signal sent by mobile phones) and health problems, which will lead to persistent fatigue, insomnia and headache. The radiation intensity near the cell phone tower in Bordeaux is measured by professional equipment to be 70 microwatts/cm2. Latvian research shows that children will suffer from the following symptoms in a radiation environment with a radiation intensity 100000 times lower than that near Bordeaux cell phone tower: muscle fatigue, slow response, and decreased memory and attention.
Many other studies have also pointed out the link between radio radiation and leukemia. A study on residents near a TV tower in Sydney shows that the incidence of leukemia among local residents is rising. In Britain and Northern Ireland, there are also reports that the incidence of leukemia among residents near TV towers is too high.
China people said.
Recently, residents living in Beijing, Lanzhou and other places reported to the media that the communication base station tower built on the roof of their own community will produce electromagnetic radiation, which will cause discomfort to the human body. So, is the communication base station the "culprit" of electromagnetic radiation?
Professor Li Kaibao, chairman of the Radiation and Protection Branch of the Chinese Medical Association, said that the radiation of the communication base station is very small and will not affect human health, so ordinary people need not worry.
A communication base station refers to a low-power wireless antenna that communicates with a user's mobile phone. According to its service scope and the number of users, the transmission power varies from several watts to several hundred watts. In general, the base station antenna is installed on the building or transmission tower at a distance of15-50m from the ground.
Regarding whether the communication base station is harmful to human health, some foreign researchers believe that the radiation of the base station antenna is relatively weak, and it is generally installed on the top of the building. Most of the radiation released will be absorbed by the building and will not cause harm to people living under the base station antenna. However, in real life, some residents who live near the base station for a long time report that they often have symptoms such as headache, insomnia, nausea, memory loss and loss of appetite.
In this regard, Professor Li Kaibao said that the radio frequency emitted by the base station antenna mainly extends in the horizontal direction and rarely emits in the vertical direction. Therefore, a person may only be affected by radiation near the horizontal direction of the antenna, and some people's discomfort symptoms may also be caused by psychological reasons.
Professor Li Kaibao said that China's laws stipulate that the construction of mobile communication base stations must meet the requirements of the Regulations on the Protection of Electromagnetic Radiation and the Health Standard for Environmental Electromagnetic Waves. It is stipulated that as long as the electric field intensity is less than 0/2 volt per meter/kloc-or the power density is less than 40 microwatts per square centimeter, it will meet the safety standards, even lower than the radiation level of mobile phones and computers, so it will not affect the health of nearby residents. In recent years, China's environmental protection department has repeatedly tested base stations in various places, and the results show that the radiation amount is far below the limit stipulated by the national electromagnetic radiation protection standard.
However, Professor Li Kaibao finally pointed out that it is not excluded that the antenna of the communication base station will cause harm to children. Because children's nervous system is in the development stage, the skull is thinner than that of adults, and they lack the ability to defend against radiation. He said that some western countries have made explicit provisions prohibiting the installation of cell phone repeater antennas on the roofs of kindergartens, schools and hospitals, and those that have been installed must be removed immediately.
Five Effects of Electromagnetic Radiation
A survey by the World Health Organization shows that electromagnetic radiation has five major effects on the human body:
1. Electromagnetic radiation is the main cause of cardiovascular disease, diabetes and cancer mutation.
2. Electromagnetic radiation causes direct harm to human reproductive system, nervous system and immune system.
3. Electromagnetic radiation is the inducing factor of abortion, infertility, teratoma and other diseases.
4. Excessive electromagnetic radiation directly affects brain tissue development, bone marrow development, decreased vision, liver diseases and decreased hematopoietic function, which can lead to retinal detachment in severe cases.
5. Electromagnetic radiation can reduce male sexual function, female endocrine disorder and menstrual disorder.
Brief introduction of electromagnetic pollution
The so-called electromagnetic pollution means that the interaction between electric field and magnetic field produces electromagnetic waves. The phenomenon that electromagnetic waves are emitted into the air is called electromagnetic radiation, and excessive electromagnetic radiation forms electromagnetic pollution.
Electromagnetic radiation is easy to exceed the standard;
1. Within 0.6- 1.5m of the computer; 2. Home appliances such as televisions and stereos are relatively concentrated in the living room; 3. Around industrial, scientific and medical electrical equipment; 4. Around the radio and television transmission tower; 5. Around various microwave towers; 6. Bypass the radar; 7. Around high-voltage power transmission and transformation lines and equipment.