In modern society, electromagnetic radiation affects human health, and it is becoming more and more serious. Who can prevent electromagnetic radiation well?

The electromagnetic field of induction cooker can cause cancer.

The induction cooker is time-saving and labor-saving, and it is easy to match with the overall decoration of the kitchen. However, at present, there is no relevant standard of low-frequency electromagnetic field in China. Through the measurement of several brands, the magnetic field intensity is far greater than the national standards of Switzerland, Sweden and other countries.

Expert's speech: According to Li Tianlin of China Preventive Medicine Research Association, the induction cooker uses electromagnetic induction to generate magnetic eddy current to heat food, and when it works, it will generate extremely low-frequency electric and magnetic fields. Compared with the microwave oven, the electromagnetic radiation of the induction cooker is much more open, and people need to stare at it all the time when using it, which is quite harmful. The World Health Organization lists extremely low frequency electromagnetic fields as carcinogens along with benzene and welding smoke. If there are magnetic substances in blood or cells, they are easily induced by magnetism, which leads to the accumulation of heavy metals in the body and hinders the normal activities of blood and cells.

Good protection: consumers should choose products certified by China National Electrotechnical Certification Committee or European C.E.; When in use, the distance should be at least 40 cm; Minimize the time of contact with the induction cooker; Don't put the induction cooker on the table when eating hot pot. It's better to cover it with a metal partition.

Experts say that the radiation frequency of induction cooker is only one sixtieth of that of mobile phone. Therefore, electromagnetic waves are not "invisible killers". If used properly, it will also have a good impact on people's health.

Most of the "magnetic force" generated by the induction cooker is distributed at the bottom of the pot, forming a closed magnetic field.

When the cooker is placed on the induction cooker, the highest intensity of the closed magnetic field generated by the induction cooker is 160 milligauss at the edge of the induction cooker, while the signal magnetic field generated by the mobile phone is close to 1600 milligauss, which is 10 times of the edge magnetic field of the induction cooker. It can be seen that the magnetic field generated by induction cooker has much less influence on human body.

When the cooker vertically leaves the panel of the induction cooker for 3-5 cm, the cooker will not regenerate heat outside the closed magnetic field range, and the induction cooker will automatically stop working; The horizontal magnetic field outside the closed magnetic field is very weak, accounting for about 0.00% of the total magnetic field energy, even close to the earth's magnetic field.

When the minimum diameter of the pot is less than 8 cm, the induction cooker can't work either. Therefore, there is no need to worry about the influence of the "magnetism" of the induction cooker on the human body.

First: choose famous brands. All electrical appliances in life will produce radiation, and induction cookers are no exception. Although the radiation of the induction cooker itself is small, choosing a high-quality induction cooker will better protect your safety.

Second: the power is right. In order to avoid unnecessary waste, please choose an induction cooker suitable for your home use. Like a general family of three, buying an 800-watt induction cooker can meet the requirements. If there are many people, you can choose 1000W-2000W-2000 W high-power induction cooker.

Third: the appearance of the furnace surface is flat and undamaged. Pay attention to the flatness of the furnace surface when purchasing. If the furnace surface is convex, concave or inclined on one side, it will affect the normal production of thermal efficiency.

Four essentials: check in person. When buying, you can shake the induction cooker upside down to see if there are gaps and looseness between the fan blades and the shaft, and between the shaft and the bearing; After electrifying, the motor should have no obvious noise or rubbing sound, and the blades should rotate smoothly without shaking and rotation.

Induction cookers are favored by consumers because of their safety, sanitation, energy saving, flameless cooking and convenient use, but many brands of induction cookers make it difficult for customers to choose. Induction cooker is a high-power electrical appliance, which is closely related to everyone's life. We should consider professional quality, safety, price and after-sales service when buying, and we must buy in regular shopping malls. The author has some experience in purchasing induction cookers, which is now provided for your reference.

Regular manufacturers pay special attention to product quality and safety. The author reminds everyone that,

The texture of the top plate of the induction cooker is very important, and whether the magnetic field lines fully penetrate the top plate of the induction cooker is directly reflected in the heating effect of the induction cooker on the pot. Authorities in the induction cooker industry agree that "ceramics" is the best material for the top plate of induction cookers. The ceramic top plate of induction cooker has good heat conduction effect, and the magnetic field lines are fully penetrated, saving energy and money. The control panel of the induction cooker is preferably designed to be flat and made of insulating and waterproof materials. Metal buttons are used in the control panel of non-planar design induction cooker, which may easily cause water to enter the body and affect the service life of induction cooker, and even cause users to get an electric shock and endanger their life safety. Therefore, when we buy an induction cooker, we must pay attention to whether the top plate of the induction cooker is ceramic and whether the control panel is made of PTC insulating and waterproof materials. In addition, whether the control panel is plane design is also important.

According to the author's observation, there are two kinds of induction cooker top plates on the market:

One is the ceramic top plate, which is white and colorful. The induction cooker industry divides ceramic ceilings into three grades according to the actual working indicators of ceilings. Class A is the Japanese NEG space ceramic ceiling, which is a micron-sized crystal. After being fired at a high temperature of 1500℃ for 45 days, it can resist high temperature 1 100℃, with a temperature difference of 800℃ and strong impact resistance. Because of its compact texture and structure, easy cleaning, no discoloration, complete penetration of magnetic field lines and high thermal efficiency, NEG space ceramic ceiling is recognized as an "ambassador" for energy saving and cleaning in the induction cooker industry. Class B is a domestic ultra-white ceramic roof, and the firing cycle is about 7 days. It is fired at 500 ~ 600℃, then cooled and cut at 200℃. It is not molded at one time. Although it is also white, it is prone to yellowing and discoloration, with poor penetration effect of magnetic lines, low thermal efficiency, temperature difference resistance and even serious roof cracking, thus endangering the personal safety of consumers. C-class ceramic roof is made in China, and the manufacturing process is simpler. Once used, it will turn yellow and discolor in a short time, which is worse than the B-class roof.

The author has some experience in distinguishing the ceramic top plate of A-class, B-class or C-class induction cooker. Class c board can be recognized at a glance. Most of the top plates of induction cookers are C-class plates printed with flowers, plants, insects and fish. Because they turn yellow and change color quickly, manufacturers print patterns to cover up their shortcomings. Although the B-grade board and the A-grade board are both white, it is not difficult to distinguish them. B-grade board is not formed by one-time firing and needs to be cut, so the edge is rough. If you observe it carefully and experience it with your hands, you can reach the bottom immediately. A-grade board is made by one-time firing at ultra-high temperature, with smooth edges and no cutting marks. In addition, comparing the two kinds of top plates together, the smoothness and crystal transparency of B-grade plate are much worse than that of A-grade plate, and the back color of B-grade plate is dark yellow, while the front and back colors of A-grade plate are the same. The induction cooker is a kitchen cooker, and it has to deal with oil fume every day. A-class ceramic roof is white, even if there is dirt on it, it can be as clean as new after proper cleaning. The merchants of Class B and Class C ceramic roof induction cookers promise in writing that they will not change color after long-term use, and they can be as clean as new, and will not reduce thermal efficiency and endanger personal safety, which is acceptable.

The other is the glass-ceramic top plate, which is black. Like the B-class domestic super-grade ceramic roof, the glass-ceramic roof is difficult to compare with the A-class NEG space ceramic roof in terms of high temperature resistance, temperature difference between hot and cold, impact resistance, thermal conductivity and penetration of magnetic lines. Because it is black, it won't turn yellow or change color. In the past, the induction cooker market has been dominated by white ceramic ceilings. In the past two years, the appearance of black microcrystalline glass ceiling induction cooker has made consumers feel refreshed, and there are also many manufacturers who follow suit to produce this kind of ceiling, with uneven quality. The top plate is made of glass ceramics with high crystal permeability. At present, the only manufacturer in the industry that can produce glass-ceramic roof with relatively stable quality is "Fute".

According to the survey, electromagnetic technology was applied to the production of civil induction cookers in the mid-1980s internationally, and induction cookers were produced and sold in China in the early 1990s. However, some manufacturers of induction cookers advertised that they had started to produce induction cookers and put them on the market in the 1970s. This false and misleading propaganda infringes on the legitimate rights and interests of consumers.

In my opinion, when we buy an induction cooker, we should not only know the product quality, but also the after-sales service is very important. Professional induction cooker brands should set up an independent customer service center in the local area, and write an after-sales commitment.

I hope the above discussion can help you to buy a safe, cost-effective and good after-sales service induction cooker and feel the happiness brought by modern technology to our lives.

1. If you are exposed to "ultra-intense" electromagnetic radiation for a long time, the following symptoms may occur: accelerated skin aging. The incidence of various malignant tumors has increased. The abortion rate of pregnant women increased, and the incidence of teratoma increased. Resistance is reduced and growth and development are delayed. There are neurasthenia symptoms such as headache, insomnia and arrhythmia.

2. Stay away from the microwave oven at least 1 m after starting. If you are pregnant, don't go near it! The national inspection standard is to measure at a distance of 5 cm.

Leakage is inevitable. But air leakage is not normal.

3. The high-voltage capacitor on the inner wall has been charged, and there is still electricity in it after the power supply is cut off.

4. The following maintenance is extracted from:/health/special/c12291/20040519101689.shtml.

The main content of maintenance is cleaning. Please pay attention to the following points when cleaning:

(1) Unplug the power plug from the power outlet before cleaning.

(2) After daily use, immediately wipe the dirt on the oven door, oven cavity and glass plate with a wet cloth, which is the easiest to clean. If it is not cleaned immediately every day, it is best to use a container to heat some water into steam after reuse to soften the dirt in the furnace, and then it will be easy to clean and clean with a wet cloth. If the dirt is serious, it is also allowed to scrub with neutral detergent or soapy water (water washing is not allowed). But it is forbidden to scrub with banana oil, gasoline and hard cloth or brush. This will destroy the paint layer and lead to rust in the furnace cavity.

(3) If the microwave oven is used for a long time, there will be peculiar smell in the cavity. Lemon or vinegar can be boiled in the oven with water, and the smell can be eliminated.

(4) Whether the microwave oven is used or scrubbed, there will be water vapor or moisture in the cavity. Therefore, it will greatly reduce the failure rate and prolong the service life of microwave ovens by drying them with dry cloth or slightly opening some oven doors to make them ventilate and dry.

Harm of electromagnetic radiation and its prevention

Electromagnetic radiation and health

The 20th century is called the electrical age. More and more power stations and transmission lines were built, and various electrical appliances went deep into factories, laboratories, offices and ordinary families. However, whether electromagnetic fields, especially power frequency electromagnetic fields (50-60 Hz) have an impact on human health has always been a concern.

In the early 1960s, relevant experts began to discuss this issue. At first, experts only paid attention to the role of electric field, but ignored the role of magnetic field. Because at that time, people mistakenly thought that the magnetic field component in this electromagnetic field was very small and could not have a perceptible impact on human health. In many countries, health care standards only stipulate the allowable electric field components in power frequency electromagnetic fields; When manufacturing all kinds of electrical equipment and appliances and erecting transmission lines, only the prescribed standards of electric field components are considered, but the maximum allowable limit of magnetic field components is not considered. However, a large number of investigations and statistical analysis later showed that magnetic fields can also affect human health. For example, the probability of various tumor lesions in human body is closely related to the received low-frequency electromagnetic 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. Some reports also pointed out that the decrease of secretion of some hormones under the action of electromagnetic field may also be the cause of the development of breast tumors.

So far, there is no direct evidence that mobile phones are harmful to health, but in general, it is best to make a long story short when using mobile phones.

What do you know about electromagnetic radiation?

Some investigation reports point out that people who are exposed to electromagnetic radiation often have a greater risk of breast cancer if they are exposed to high temperature again; People who have been electrical engineers for a long time will increase the risk of acute leukemia if they are exposed to gasoline, pesticides or pesticides again.

Many investigation reports also pointed out that people who are engaged in "electrical appliances", children and people who use household appliances improperly (children who often play video games, women and children who often use electric blankets and other heaters, etc.). ) the risk of being damaged by low-frequency magnetic fields is greater. Some countries also have such regulations for pregnant women: the baby can't go to the computer for 3-6 months before birth.

The intensity and accumulation of low-frequency magnetic field radiation will affect the probability of illness. Moreover, the incubation period after some people get sick is as long as 10- 15 years. According to international health standards, the upper limit of allowable magnetic induction intensity is 100 microtesla. Electromagnetic radiation is like the relationship between the sun and ultraviolet rays. If you want to enjoy the sunshine, you will inevitably receive ultraviolet radiation. Electromagnetic radiation is invisible, intangible and difficult to perceive, so its harm is particularly hidden. From electronic alarm clocks, hair dryers, microwave ovens and electric irons to computers, fax machines and telephones, we are constantly exposed to electromagnetic "comfort". Walking out of the house, wires and all kinds of motor equipment make us very easy to be in the electromagnetic field. The deterioration of electromagnetic environment in 2 1 century is a foregone conclusion.

==

Preventive measures of electromagnetic radiation

As we all know, where there is electricity, there is electromagnetic radiation, which is invisible, intangible and impossible to prevent. So what kind of preventive measures people take is very important.

First of all, we should widely publicize the basic knowledge of electromagnetic radiation, so that people can know how electromagnetic radiation is produced, what harm it will cause to human body, what kind of places it uses and what kind of equipment will produce electromagnetic radiation. This is a long-term patient and meticulous work.

Secondly, take some necessary preventive measures to avoid or reduce electromagnetic radiation. For example, there is a kind of anti-radiation clothing made of various anti-electromagnetic radiation raw materials and woven into clothing fabrics, and its electromagnetic shielding effect is very obvious. If our merchants produce more such clothes, the harm of electromagnetic radiation to human body will be greatly weakened.

How to prevent the harm caused by electromagnetic radiation

1. Prevent the influence of electromagnetic radiation on human body;

(1) Shielding room: made of metal (sheet or mesh), which is mostly used to shield the active field of large mechanical groups or control rooms;

(2) Protective clothing, protective helmet and protective glasses: These are personal protective devices, which can effectively reduce the intensity of magnetic radiation to protect the health of workers exposed to electromagnetic radiation;

(3) Shielding cover: This is the main method to shield the active field of small instruments. The materials used for shielding are usually conductive materials with low resistivity, such as copper and aluminum.

(4) For the electromagnetic radiation generated by mobile phones, you can wear headphones to reduce the electromagnetic radiation. According to the experiment of Thiel Laboratory of Institute of Telecommunication Transmission of Ministry of Information Industry, the radiation received by the head when talking with headphones is between1100 and 1/200 of the radiation received when talking directly with a mobile phone.

2. The main methods to prevent electromagnetic radiation from leaking computer secrets are:

(1) Passive mode: electromagnetic shielding to prevent electromagnetic waves from leaking out. The disadvantage of using this mode alone is that if the shielding is not complete, the high-sensitivity electromagnetic receiving equipment can still obtain information;

(2) Active mode: emit electromagnetic waves, and the electromagnetic receiving equipment used for stealing secrets receives the interfered signals. The disadvantage of using this mode alone is that it is still possible to recover useful information if well-designed software is used to analyze the received disturbed signal.

Therefore, the best way is to mix the two modes at the same time.

Therefore, it is necessary to adopt passive mode to prevent electromagnetic waves from leaking out from these aspects. Just shielding the display is not enough. When using the computer secretly, all unnecessary cables and peripherals should be removed.

A battery-powered laptop can dispense with this connection. However, if public power supply must be used, passive mode filtering equipment or active mode interference signal injection into the power line is a measure that can be considered.

==

The harm of electromagnetic radiation to the quality of living environment can not be ignored.

At present, with people paying more and more attention to health, buyers have begun to pay attention to environmental quality besides location, price, apartment type, garden and property when choosing a house. It is understood that in order to let people enjoy a safe and healthy living environment, the Law of the People's Republic of China on Environmental Impact Assessment will come into effect on September 1, which means that in the future, residential community projects need to carry out mandatory environmental impact assessment before the project is approved.

Electromagnetic radiation surfaced.

For outdoor environmental quality, noise, air index and electromagnetic radiation are three issues that people are most concerned about, especially electromagnetic radiation. Because electromagnetic radiation is invisible and invisible, people don't know much about it, so many residents living around high-voltage lines, substations, radio stations, TV stations and radar stations have an inexplicable fear. However, experts from the State Environmental Protection Administration pointed out that although electromagnetic radiation is harmful to a certain extent, on the one hand, electromagnetic radiation is not harmful at any time and any place; On the one hand, electromagnetic radiation can be shielded, so residents don't have to be nervous about electromagnetic radiation.

Correct understanding of electromagnetic radiation

With the development and progress of society, a large number of equipment and activities with electromagnetic radiation such as TV towers, radio stations, radars, satellite communications and microwaves are also increasing. These devices have played an important role in the improvement of human living standards and the progress of social development, and the electromagnetic waves generated at the same time are also a kind of environmental pollution factor. The more social progress, the more serious electromagnetic pollution. Therefore, electromagnetic wave is not only an information carrier and energy flow carrier beneficial to social development, but also a pollution factor endangering human life, and its harm has been highly valued by the international environmental protection community. Therefore, it is necessary to make full use of electromagnetic energy as a resource; It is also necessary to strengthen management and control the negative effects of electromagnetic radiation to a minimum.

According to experts from the State Environmental Protection Administration, from a professional point of view, electromagnetic radiation generally refers to electromagnetic waves with frequencies above 100KHZ. The sources of electromagnetic field are natural and artificial. First of all, the earth itself is a big magnetic field. Sunlight itself is also a frequency band of electromagnetic waves, as well as lightning and electromagnetic waves generated by other planets. These are all naturally generated, and human beings have evolved in this environment and formed a harmonious relationship with nature. Therefore, natural electromagnetic radiation has no harm to human body. However, since the19th century, with the development of science, human beings have invented many facilities that use electromagnetic energy to work. These facilities emit a large number of electromagnetic radiation or generate electromagnetic fields into the environment, which makes the electromagnetic radiation problem in the environment more and more serious, thus creating the problem of electromagnetic environmental protection. Facilities that generate electromagnetic radiation can be roughly divided into five categories:

1, broadcast and television transmission systems, such as TV transmission towers and broadcast relay stations;

2. Wireless communication transmission systems, such as mobile phone base stations;

3. High-voltage power transmission and transformation systems, such as high-voltage lines and substations;

4. Electrified railways, such as maglev trains;

5, industrial, scientific and medical electromagnetic energy facilities, such as high frequency melting furnace;

Harm of electromagnetic radiation

Humans themselves live in a huge electromagnetic field, and electromagnetic radiation is everywhere, so electromagnetic radiation is not as terrible as imagined. Only when the electromagnetic radiation exceeds a certain value will it have a negative impact on people's health. According to the electromagnetic radiation protection regulations issued by the State Environmental Protection Agency, if the electric field intensity is lower than 40 volts per meter, it should be safe. Even if it exceeds this value, it will not necessarily cause injury, which depends on the individual's resistance and the time and distance of contact. In addition, experts also pointed out that electromagnetic waves are everywhere, which brings infinite convenience to our lives. We should treat them correctly and make rational use of them. There is absolutely no need to worry too much. As long as proper shielding and protection are carried out, the radiation impact can be greatly reduced.

==

How terrible is electromagnetic radiation?

In recent years, domestic and foreign media have reported that electromagnetic radiation is harmful: more than 400 children in Italy suffer from leukemia every year, and experts believe that the cause is serious electromagnetic pollution; A cancer medical foundation in the United States conducted a sample survey of some patients who were injured by electromagnetic radiation. The results show that the growth rate of cancer cells in people working near high-voltage lines is 24 times faster than that of ordinary people. Of the 20 million children born every year in China, 350,000 are disabled children, of whom 250,000 are mentally retarded. Some experts believe that electromagnetic radiation is one of the influencing factors.

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 the surface of the earth will 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 in 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 fully enjoying the convenience and comfort brought by electromagnetic radiation, people feel its negative effects more and more. For example, electromagnetic radiation in electromagnetic compatibility leads to navigation system, medical information system, industrial process control and information transmission system out of control, which interferes 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. I also heard that electromagnetic radiation can penetrate many substances, including the human body. Therefore, some people compare the pollution caused by electromagnetic radiation of products to "invisible killer", so how harmful will electromagnetic radiation be 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, only when the electromagnetic radiation exceeds a certain intensity (that is, the limit of safety and health standards) will electromagnetic pollution have a negative impact on the human body, leading to headache, insomnia, memory loss, rising or falling blood pressure and critical cardiac abnormalities. 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 abilities to withstand electromagnetic radiation at different ages. Even in an environment exceeding the standard, it does not mean that everyone will get sick, so there is no need to feel "afraid" of electromagnetic radiation. Of course, preventive measures should 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 with excessive electromagnetic radiation 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.

"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, the impact and harm of electromagnetic radiation on the human body needs further discussion. "

However, Li Tianlin believes that as a big country, China's 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 research and develop ultra-low electromagnetic radiation appliances and equipment and ensure the safety of consumers. At the same time, electromagnetic radiation control is brought into the scope of normalized social environmental protection, effectively protecting the legitimate rights and interests of consumers and workers.

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 mandatory 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, 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.