First, the electromagnetic wave of household appliances
Whether the electromagnetic waves generated by various household appliances can lead to brain cancer, leukemia, deformed children, abortion, etc. Although there are many objections, some experts think it is true. Dr. Carpenter of new york University thinks that 10- 15% of all childhood cancer diseases are caused by 100V household power supplies and appliances. At the same time, the Environmental Protection Agency (EPA) of the United States 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 in electrical products that is 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 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 20-50MG, and its electric field intensity is nearly 2KV/m, while the electric field intensity under 50V high-voltage line is 3 kV/m. The strong electric field makes some people feel uncomfortable after sleeping, especially pregnant women. It is best to ban the use of electric mattresses.
2. Computer
Computers 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. So computer users are in an electric field, and the electric field force is perpendicular to the surface of the conductor between people and the ground. Magnetic lines of force are different from electric lines. The magnetic field lines generated by the current in the computer display are not affected by the human body or the ground, 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 passes through all objects more easily. Therefore, compared with electric field, magnetic field has a greater influence on living things. During the period from 1979 to 1982, 42 pregnant women and 1 premature babies were used in 7 terminal monitors working in Ottawa, Canada, and the remaining 2 gave birth to babies with respiratory diseases. A pregnant woman who didn't use a terminal monitor gave birth to a normal baby. 1978, four pregnant women and newborns of an international company had heart malformations. They are between 20 and 35 years old and have not taken drugs during pregnancy. During the same period, the children of three pregnant women who didn't use the terminal monitor in the company were all normal. In the following two years, there were seven incidents related to terminal monitors in the United States and Canada. For example, 7 out of 13 pregnant women working at the check-in counter of Air Canada had miscarriages. 1980 12 pregnant women worked in sears department store branch, which has 25 terminal monitors.
1982, a Spanish neurophysiologist irradiated chicken fetus with a strong magnetic field of 12MG (equivalent to the magnetic field intensity 30Cm away from the side of the terminal display). The results showed that 80% of the chicken fetuses stopped developing, especially caused significant abnormalities in the cranial nerve system, which indirectly proved the harm of terminal display to human body. A recent research report pointed out that if pregnant women use computers for more than 20 hours, the abortion rate will increase by 80%, and the birth rate of deformed children will also increase.
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 different, but the research shows that when two 20W fluorescent lamps are juxtaposed, the magnetic field intensity outside 100 cm is 100MG, and the magnetic field intensity outside 25Cm is 6.5MG. The desk lamp near the user's head is the most harmful to the health. In addition, fluorescent lamps not only generate electromagnetic waves, but also emit ultraviolet rays, which can lead to skin cancer and cataracts.
mobile phone
The output power of mobile phone is as high as1w. At present, the output power of small mobile phones such as Palm Bao is about 0.6W, and the signal transmission of mobile phones adopts 800 ~ 900 MHz and 1800 ~ 2000 MHz microwaves. The thermal effect produced by this microwave oven 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 will irradiate the eyes and brain for a long time when used repeatedly. In the 1990s, American mobile phone factories and communication companies received huge compensation lawsuits. Most plaintiffs believe that they have brain diseases such as brain tumors after using mobile phones. Besides, there are many murders. It has been recognized that the electromagnetic waves of mobile phones will interfere with avionics and lead to aircraft accidents. In March last year, Japan banned the use of mobile phones in hospitals because people found that the electromagnetic waves emitted by mobile phones would affect the work of medical equipment.
5. Others
In addition, 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 lot of current are: vacuum cleaners, air conditioners, hair dryers, etc. 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 70MG, 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 0. 1MG. Although the difference is 700 times, its use time is short and will not cause great harm. But long-term use of hair dryers by beauticians and hairdressers may be harmful. In addition, a vacuum cleaner (90MG) and an air purifier (2000 mg at the bottom, 30 cm outside and 80MG outside) will generate strong magnetic fields.
Second, the influence of electromagnetic waves on 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, and the magnetic field may affect the iron molecules in the blood when passing 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 tissues with rapid cell proliferation, such as blood cells, genitals and lymph, 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 magnetic induction (the object forming a magnetic field magnetizes other objects), magnetization occurs, that is, 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, it is difficult to do long-term follow-up investigation. The influence of electromagnetic waves on human body has been confirmed by epidemiological investigation and animal experiments.
University of Colorado 1979 N? Professor wertheimer and E? Professor Ripper made an epidemiological investigation between high-voltage power lines and childhood cancer. The results show that the incidence of leukemia in children under strong electromagnetic field is more than three times higher than that in other children. The so-called epidemiological investigation is a research method to compare the factors that cause cancer with the increase rate of cancer patients. A famous epidemiological study is "smoking and lung cancer", that is, comparing the number of lung cancer patients among a large number of smokers and non-smokers. What is studied here is the relationship between smoking and lung cancer. This method is used to study the relationship between electromagnetic waves and childhood 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 extremely low frequency electromagnetic waves on the human body. At present, experts and scholars in the United States, Europe, Japan and other countries believe that strong electromagnetic waves are harmful to human body through various animal experiments. 1995110 In October, research institutions in Sweden and Denmark published the research results in the European Journal of Cancer. According to the research report, the incidence of leukemia in children with magnetic fields above 5 mg is 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 cells and cell surfaces of chickens, pigs and mice, leading to fetal malformation and malignant lymphoma (3) reduce the reaction ability of mice, reduce the weight of testicles, change the chemical composition of the brain and slow down the growth rate of the body. The third point will especially 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 electromagnetic waves affect health has become the focus of debate on the harmful theory of electromagnetic waves. The harm of strong electromagnetic waves to human body has been scientifically verified, so all countries in the world have stipulated the maximum time limit of exposure to electromagnetic fields to protect human health.
1. Thermal action
The thermal effect of electromagnetic waves will cause the temperature of tissues and cells to rise. The research shows that the microwave with the wavelength below 3Cm can penetrate the skin 1Cm, while the microwave with the wavelength of 0.25- 1m can penetrate the skin and reach various organs of the human body. Microwave absorbed by the skin is converted into heat, which raises the temperature of body tissues. The results of animal experiments show that the increase of biological body temperature causes behavioral changes and abnormal behaviors. Moreover, the uterine temperature above 39℃ affects the immune function of the body. According to analysis, the most vulnerable places of life are eyes, lenses and testicles, and there are 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 endoscope produces opaque parts, which makes people unable to see the object clearly. 1- 10GHZ microwave is easy to cause this cataract. Someone has done this animal experiment and irradiated rabbit eyes with 2450MHZ electromagnetic wave (which belongs to the frequency range of microwave oven) for 10 minute. As a result, cataracts began to appear. The testicular temperature of male germ cell aggregate is relatively low (about 36℃) relative to body temperature, and it is very sensitive to heat. The increase of temperature has a decisive influence on the germ cells undergoing meiosis.
Step 2 stimulate
Induction effect in electromagnetic wave stimulation. Electrical signals regulate all functions of the human body. The observation of nerve cells, muscle cells and other cells with the least function that can be excited in 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 human body makes the excitation conduction system of nerve and the biological circuit system of muscle movement system abnormal, which makes human body change. This external current stimulates nerve cells to feel electric shock, and at the same time stimulates muscles to produce muscle contraction or voluntary movement. Stimulate the myocardium to soften the ventricle, the heart stops beating, and stimulate the respiratory muscles to stop breathing.
3. Non-thermal action
Most epidemiological findings such as childhood leukemia caused by electromagnetic fields of high-voltage transmission lines mentioned above belong to this category. At present, it is difficult to confirm the effect of non-thermal action, so it cannot be explained clearly. 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 50-60HZ also leads to the outflow of calcium ions. It can be seen that general household appliances (60HZ) are also harmful to human body.
Another study reports that the secretion of animal pineal gland (melatonin) inhibits tumor cells, while low frequency changes the secretion of pineal gland.
Extremely low frequency and extremely low frequency 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 use weak electrical signals to transmit heat, pain, vision and other senses through nerves, but when this communication between cells is hindered, foreign cells will proliferate and form cancer. The external energy that can cause communication barriers is much weaker than expected. In fact, when electromagnetic waves act on the cells cultured in the experiment, it is found that the movement of chemical substances between cells has changed, the production of genetic factors has been hindered, the production of hormones and chemical substances has changed, and the activity of cancer cells has increased. Experiments on mice show that electromagnetic waves will hinder their appetite, breathing, sleep and so on. And human experiments show that electromagnetic waves will weaken the pulse and make brain waves abnormal.
Third, strengthen protection.
The theory that electromagnetic waves are harmful has been questioned, because at present, human beings cannot explain the causes of leukemia and other diseases. Even though modern medicine and science are quite developed, the research on human body is still far from enough. At the beginning of the 20th century, when some scholars suggested that smoking caused lung cancer, they also met with doubts from many scholars, including doctors. It was not until 30 years later that the medical community admitted that smoking caused lung cancer.
The research on electromagnetic waves is only over 20 years. At the same time, unlike smoking, electromagnetic waves are very complicated in intensity, frequency, contact time and waveform, and it is difficult to prove their relationship with cancer. Like smoking, people should raise 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, it is necessary to avoid independent contact with strong electromagnetic fields; When contact is needed, appropriate measures should be taken.
Note: the electric field intensity is expressed by V/M,
The strength of the magnetic field is expressed by G (Gauss) or T (Tesla).
( 1G= 1000MG， 1T= 104G， 1μT= 10MG。 )
( 1MG=80MA/M)。