---------------------------. These devices have played an important role in human life and development. Because most of the electromagnetic radiation is useful emission, it will be an inevitable trend to have high electromagnetic energy density and dense spectrum in the environment. However, electromagnetic radiation itself is an important factor of environmental pollution, which has a potential and long-term impact on public health; It has a strong interference with household appliances, medical equipment, military facilities, etc., and even has disastrous consequences. After investigating more than 43, residents living near high-voltage lines for a long time, scientists from Karolinska University in Stockholm, Sweden clearly pointed out that electromagnetic waves are directly related to cancer, especially brain tumors and childhood leukemia. Most hospitals in Japan have designated restricted areas, and it is forbidden to use mobile phones to avoid interference with sensitive medical equipment, such as dysfunction of blood transfusion pumps. It is forbidden to use CD player or laptop computer on the plane, so as not to interfere with the control system of the plane. Electromagnetic radiation pollution is energy flow pollution, which is invisible and intangible, but it fills the whole space and has strong penetration. Any creature or equipment is surrounded by it and affected by it unless it is shielded. Moreover, the more social development progresses, the more serious the environmental pollution caused by electromagnetic radiation. Therefore, electromagnetic wave is not only an information carrier and energy flow carrier beneficial to social development, but also a pollution factor harmful to human life, and its harmful effect has been highly valued by the international environmental protection field.
First, electromagnetic waves of household appliances
Whether electromagnetic waves produced by various household appliances can cause brain cancer, leukemia, deformed children, abortion, etc., although there are many objections, some experts think this is a fact. Dr Carpenter of new york University thinks that 1-15% of all children's cancer diseases are caused by 1V household power supply and electrical appliances. At the same time, the US Environmental Protection Agency (EPA) also expressed concern about this and warned people to avoid contact with electromagnetic waves as much as possible.
1. Electric mattress
Electric mattress is a typical product that has been in close contact with the body for a long time. Epidemiological investigation shows that the electric mattress is in direct contact with the skin, and the resting cells are exposed to electromagnetic waves for a long time, thus causing human health obstacles. A few centimeters away from the mattress, the magnetic field intensity is as high as 2-5MG, and its electric field intensity is nearly 2KV/m, while the electric field intensity under 5V high-voltage wire is 3kV/m.. Strong electric field makes some people feel uncomfortable after sleeping, especially pregnant women, it is best to ban the use of electric mattresses.
2. Computers
Computers have quickly entered thousands of households. The computer monitor has a high voltage generator, which can generate thousands of volts of high voltage to accelerate electrons and scan the electrons in the picture treated with fluorescent substances to generate light. Therefore, the computer user is in the electric field, and the electric field power is perpendicular to the surface of the electric conductor between man and the ground. Magnetic field lines are different from power lines. The magnetic field lines generated by the current in the computer monitor are not affected by the human body or the ground surface, and pass through the human body in a circular shape. It can be seen that the electric field is easily shielded by the conductor, while the magnetic field is easier to pass through all objects. Therefore, compared with the electric field, the magnetic field has a great influence on organisms. From 1979 to 1982, seven terminal monitors working in Ottawa Company in Canada were used. Among them, 42 pregnant women miscarried, 1 premature, and the remaining two gave birth to babies with respiratory diseases. A pregnant woman who didn't use the terminal monitor gave birth to a normal baby. In 1978, four pregnant women and newborns of an international company had heart malformations. They are 2 to 35 years old and have not taken drugs during pregnancy. During the same period, the children of three pregnant women who did not use the terminal display in the company were normal. In the following two years, there were seven incidents related to terminal monitors in the United States and Canada. For example, seven of the 13 pregnant women who worked at the check-in desk of Air Canada had miscarriages. In 198, 12 pregnant women who worked in Sears department store branch had miscarriages or stillbirths, and the branch had 25 terminal monitors.
In p>1982, a neurophysiologist in Spain irradiated chicken fetuses with a strong magnetic field of 12MG (equivalent to the magnetic field intensity 3Cm away from the side of the terminal display). The results showed that 8% of chicken fetuses stopped developing, especially caused significant abnormalities in the cranial nerve system, which indirectly proved that the terminal display was harmful to human body. Recently, a research report pointed out that the abortion rate of pregnant women increased by 8% when they used computers for more than 2 hours, and the birth rate of deformed children also increased.
3. Turn off the lights every day
Compared with incandescent lamp, fluorescent lamp has higher energy conversion efficiency, and its lighting effect is 4-5 times that of incandescent lamp under the same energy consumption. The magnetic field intensity produced by different fluorescent lamps is not the same, but the research shows that when two 2W fluorescent lamps are juxtaposed, the magnetic field intensity outside 1Cm is 1MG, while the magnetic field intensity outside 25Cm is 6.5MG. The most harmful thing to the body is the desk lamp close to the user's head. In addition, fluorescent lamps not only generate electromagnetic waves but also release ultraviolet rays, which can cause skin cancer and cataracts.
4. Mobile phone
The output power of mobile phone is up to 1W. At present, the output power of small mobile phones such as Palm Bao is about .6W. The signal transmission of mobile phones uses microwaves of 8 ~ 9 MHz and 18 ~ 2 MHz. The thermal effect produced by this microwave is equivalent to that of a microwave oven, and it also produces a non-thermal effect. In addition, when using the mobile phone, the mobile phone is very close to the head, and electromagnetic waves irradiate the eyes and brain for a long time when used repeatedly. In the 199s, mobile phone factories and communication companies in the United States received huge compensation lawsuits. Most plaintiffs believe that they have brain diseases such as brain tumors after using mobile phones. In addition, there are many cases of murder. It has been recognized that the electromagnetic waves of mobile phones disturb avionics and cause aircraft accidents. In March last year, Japan banned the use of mobile phones in hospitals because people found that electromagnetic waves from mobile phones affected the work of medical devices.
5. Others
Besides, we use many electrical appliances such as air conditioners, hair dryers, ovens, vacuum cleaners, frying machines, coffee pots, electronic watches, lighting appliances and so on. Products that use a large amount of current are: vacuum cleaners, air conditioners, hair dryers, etc. that use motors, and electric heaters that generate heat, such as ovens and frying machines. The strength of the magnetic field generated by these products is directly proportional to their power. Among them, the strongest magnetic field intensity is the blower, which is 7MG, hundreds of times higher than that of incandescent lamps, while the allowable contact intensity for 24 hours stipulated by IRPA (International Radiation Protection Association) is .1MG. Although the difference is 7 times, its short use time will not cause great harm. However, it may be harmful for beauticians and hairdressers to use hair dryers for a long time. In addition, a vacuum cleaner (9MG) and an air cleaner (2 mg at the bottom, 3 cm at the outside and 8MG at the outside) generate strong magnetic fields.
second, the influence of electromagnetic waves on the human body
when the human body is in an electric field, the conductivity of the human body makes the current flow into the earth through the skin, while the magnetic field may affect the iron molecules in the blood when it passes through the human body. The electric field passing through the skin may cause skin diseases such as eczema. Some people say that women who often use computers are prone to skin aging. Similarly, people realize that electromagnetic waves are more harmful to blood cells, genitals, lymph and other tissues with rapid cell proliferation and to children.
let's take the influence of magnetic field on human body as an example to see the harm of electromagnetic wave. When the human body is in a strong magnetic field, various magnetic substances in the body will be attracted by magnetic force. At the same time, due to the magnetic induction (the object that forms the magnetic field magnetizes other objects), the magnetization phenomenon occurs, that is, the magnetic objects such as iron (Fe) in red blood cells in the body are attracted or magnetized, thus affecting other magnetic substances. Obviously, this will be harmful to health. If there are magnetic substances in blood or cells, magnetic induction will hinder the normal activities of blood and cells. The accumulation of heavy metals in the body, and the susceptibility to magnetic induction give a fatal blow to the body.
However, it is difficult to find out the influence of electromagnetic waves on human body scientifically and carefully. Because various environmental factors act on people comprehensively, and it is difficult to do long-term follow-up investigation. The influence of electromagnetic waves on human body has been verified by epidemiological investigation and animal experiments.
n from Colorado University in p>1979? Professor Wertheimer and E? Professor Leeper made an epidemiological investigation between high voltage power lines and children's cancer. The results show that the incidence of leukemia in children under strong electromagnetic field is more than 3 times higher than that in other children. The so-called epidemiological investigation is a research method to compare the factors that think the cause of cancer and the increase rate of cancer patients. A well-known epidemiological study is "Smoke and Lung Cancer", that is, comparing the number of lung cancer patients in a large number of smokers and non-smokers. Here, the relationship between smoke and lung cancer is studied. This method is used to study the relationship between electromagnetic waves and children's cancer. The report has had a great influence not only on the United States but also on European countries, making people actively study the influence of ELF electromagnetic waves on human body. At present, through various animal experiments, experts and scholars in the United States, Europe, Japan and other countries believe that strong electromagnetic waves are harmful to the human body. In November, 1995, the Swedish and Danish research organizations published the research results in the European Journal of Cancer. The research report showed that the incidence of leukemia in children with magnetic fields above 5MG was five times higher than that in normal children.
Various animal experiments show that electromagnetic waves (1) change nerve conduction substances (2) change the calcium content in and on the cells of chickens, pigs and mice, leading to abnormal fetuses and malignant lymphomas (3) reduce the reaction ability of mice, reduce the weight of testicles, change the chemical composition of the brain and reduce the growth rate of the body. The third point in particular will affect the delivery of pregnant women and the growth of children. The influence of electromagnetic wave on human body can be roughly divided into thermal effect, stimulating effect and non-thermal effect.
Whether long-term low-frequency micro-electromagnetic waves affect health has become the focus of debate on the harmful theory of electromagnetic waves. The harmfulness of strong electromagnetic waves to human body has been scientifically verified, so countries all over the world have stipulated the maximum time limit for exposure to electromagnetic fields to protect human health.
1. Thermal action
The thermal action of electromagnetic waves can cause the temperature of organism tissues and cells to rise. Studies have shown that microwaves with a wavelength below 3Cm can penetrate through the skin for 1Cm, while microwaves with a wavelength of .25-1m can penetrate through the skin and reach various organs of the human body. Microwave absorbed by the skin is converted into heat, which causes the temperature of body tissues to rise. The results of animal experiments show that the temperature of organisms increases, causing changes in behavior and abnormal behavior. Moreover, the uterine temperature above 39℃ affects the immune function of organisms. According to the analysis, the most vulnerable places in the living body are the eyes, lenses and testicles with almost no blood vessels. The most serious harm of electromagnetic wave to eyes is lens cataract. At this time, due to the temperature rise, the endoscopes produce opaque parts, which make people unable to see the objects clearly. 1-1GHZ microwave is easy to cause this kind of cataract. Someone has done this animal experiment, and irradiated the rabbit's eyes with 245MHZ electromagnetic wave (which belongs to the frequency range of microwave oven) for 1 minutes. As a result, cataract began to appear. The testicular temperature of male germ cell aggregate is low relative to body temperature (about 36℃) and is very sensitive to heat. The rise of temperature has a decisive influence on the germ cells undergoing meiosis.
2. Stimulation
There is an inductive effect in the stimulation of electromagnetic waves. Electrical signals regulate all functions of the human body. Observation of nerve cells, muscle cells and other cells with the smallest function that can be excited in the human body shows that when the potential difference between the two ends of such cells reaches a certain level, it sends an exciting signal to the nervous system or contracts muscles. However, the external current flowing to the human body makes the excitation conduction system of nerve and the biological circuit system of muscle movement system abnormal, which makes the human body change. This external current stimulates nerve cells to feel electric shock, while stimulating muscles to produce muscle contraction or voluntary movement. Stimulating the myocardium softens the ventricles, the heart stops beating, and stimulating the respiratory muscles stops breathing.
3. Non-thermal action
Most epidemiological investigation results such as childhood leukemia caused by electromagnetic field of high-voltage power lines mentioned above belong to this category. At present, it is difficult to confirm the effect of non-thermal action, so it cannot be clearly explained. The cerebral cortex of chickens and cats was placed in UHF and VHF with low frequency modulation, and calcium ions were found to flow out. Information transmission, immune system function and cell proliferation are inseparable from calcium ions. The experimental results show that the low frequency of 5-6HZ also causes calcium ions to flow out. It can be seen that general household appliances (6HZ) are also harmful to human body.
Another research report shows that the secretion of animal pineal gland (melatonin) inhibits tumor cells, while low frequency changes the secretion of pineal gland.
elf and VLF electromagnetic waves not only affect the distribution of calcium in human cell membrane, but also affect the distribution of potassium, sodium and chlorine plasma, thus affecting the secretion of human hormones.
As mentioned above, human cells transmit heat, pain, vision and other senses through nerves with weak electrical signals. However, when this communication between cells is hindered, it will produce extraordinary cell proliferation and form cancer. The external energy that can cause the communication barrier is much weaker than expected. In fact, when electromagnetic waves were applied to the cells cultured in the experiment, it was found that the movement of chemical substances between cells changed, the generation of genetic factors was hindered, the generation of hormones and chemical substances changed, and the activity of cancer cells increased. Experiments on mice show that electromagnetic waves hinder their appetite, breathing, sleep, etc., while human experiments show that electromagnetic waves weaken the pulse and make brain waves abnormal.
Third, strengthen protection
The theory of harmful electromagnetic waves has been questioned, because at present, human beings can't explain the causes of many diseases, such as leukemia. Even though modern medicine and science are quite developed, the research on the human body is still far from enough. At the beginning of the 2th century, when a scholar proposed that smoking caused lung cancer, he also encountered many scholars' questions, including doctors. It was not until 3 years later that the medical community admitted that smoking caused lung cancer.
It has only been more than 2 years since the study of electromagnetic waves. At the same time, unlike smoking, electromagnetic waves are complicated in intensity, frequency, contact time and waveform, so it is difficult to prove the relationship between them and cancer. Like smoking, people should improve their awareness of the harm of electromagnetic waves. Based on the current epidemiological investigation, people can't deny that electromagnetic waves have an impact on the human body. Therefore, we should avoid contact with strong electromagnetic fields independently; Appropriate measures should be taken when contact is necessary.
note: the intensity of electric field is expressed by V/M, and the intensity of magnetic field is expressed by g (gauss) or t (Tesla).
(1G=1MG, 1T=14G, 1μT=1MG.)
(1MG=8MA/M).