Electromagnetic radiation is electromagnetic energy in the form of electromagnetic waves through the space propagation phenomenon, its propagation speed that is usually referred to as the speed of light. Electromagnetic radiation can be arranged according to its wavelength, frequency into a number of frequency bands, the formation of the electromagnetic spectrum. The higher the frequency, the greater the quantum energy of the radiation, and the stronger its biological effect.
Sources of electromagnetic radiation can be divided into natural sources of electromagnetic radiation and man-made sources of electromagnetic radiation (high-frequency induction heating equipment, high-frequency dielectric heating equipment, short-wave and ultrashort-wave physical therapy equipment, microwave transmitting equipment, and radio broadcasting and communications and other kinds of radio frequency equipment). Lightning, sunspot activity, cosmic rays, etc. produce electromagnetic radiation, which is a natural source of electromagnetic radiation; and man-made sources of electromagnetic radiation are mainly various types of radio equipment, such as mobile telephone sets, wireless walkie-talkies, indoor wireless telephones, radio and television transmitters, microwave and satellite communication devices, radar, radio remote control, etc., but also industrial, scientific and medical equipment, such as microwave ovens, high-frequency eye protection lamps, medical magnetic *** vibration equipment, helium arc welders, radio frequency heaters, high frequency thermal laminators, AC high voltage transmission lines, transfer switches, electric motors, generators, televisions, computers, and so on. Electromagnetic radiation caused by electromagnetic emissions, it can be said that all electrical appliances produce electromagnetic radiation.
Second, the harm of electromagnetic radiation
Electromagnetic pollution has been recognized as in the air pollution, water pollution, noise pollution after the fourth major public hazard. The United Nations Conference on the Human Environment will be included in the electromagnetic radiation must be controlled as one of the main pollutants. According to foreign data show that electromagnetic radiation has become one of today's health hazards of human disease. 1998 World Health Organization lists the five major effects of electromagnetic radiation on the human body:
1. Electromagnetic radiation is a cardiovascular disease, diabetes, cancerous mutation of the main causes;
2. Electromagnetic radiation on the human reproductive system, nervous system, immune system causing harm;
3. Electromagnetic radiation is pregnant women miscarriage, infertility, teratology and other pathologies predisposing factors;
4. Electromagnetic radiation directly affects the development of children, bone marrow development, leading to vision loss, retinal detachment, liver hematopoietic function decline;
5. Electromagnetic radiation can make women endocrine disorders, menstrual disorders.
Three, commonly used electrical appliances electromagnetic radiation protection knowledge
(a) cell phone
1. When answering the phone, it is best to get the phone away from the body of the distance from the connection, and then put into the ear to talk. In addition, try not to chat on your cell phone, and be careful not to put your cell phone next to your pillow when you sleep.
2. Don't hang your cell phone on your chest, research shows that hanging your cell phone on your chest will have an impact on your heart and endocrine system. Even in the standby state of less radiation, the electromagnetic radiation around the cell phone will cause harm to the human body. People with cardiac insufficiency and arrhythmia should be especially careful not to hang their cell phones on their chests.
3. Cell phone users should try to keep their cell phones away from their waist and abdomen, and not hang them on their waist or put them in their coat pockets. When the user is in the office, at home or in the car, it is best to put the phone aside. When you are out and about, you can put your cell phone in your purse so that it is farther away from your body. Using a headset to answer a cell phone can also be effective in reducing the effects of cell phone radiation. Try to call as little as possible, try to use a headset, and don't talk continuously for more than 30 minutes.
(ii) Computer
1. Putting a few pots of cactus next to the computer can effectively absorb radiation.
2. Drink 2 to 3 cups of green tea and eat an orange every morning. If you are not accustomed to drinking green tea, chrysanthemum tea can also play a role in resisting computer radiation and regulating the body's functions, spirulina, sea buckthorn oil also has the role of anti-radiation.
3. After using the computer, the face will adsorb a lot of electromagnetic radiation particles, to wash your face with water in a timely manner, which will reduce the radiation received by more than 70%.
4. Operation of the computer is best in the display of a computer-specific color filters to mitigate the hazards of radiation, do not place idle metal objects indoors, so as not to form the re-emission of electromagnetic waves. When using the computer, to adjust the brightness of the screen, in general, the greater the screen brightness, the stronger the electromagnetic radiation, and vice versa, the smaller. However, can not be adjusted too dark, so as not to affect the effect of too little brightness, and easy to cause eye fatigue.
5. Should be as far as possible to buy new computers, do not use the old computer, the old computer radiation is generally more powerful, in the same distance, the same type of conditions, generally 1 to 2 times the new computer.
6. Computer placement is very important. Try not to let the back of the screen toward someone's place, because the strongest computer radiation is the back, followed by the left and right sides, the front of the screen, but the weakest radiation. To be able to see the word prevail, at least 50 to 75 centimeters away, which can reduce the damage of electromagnetic radiation.
7. Pay attention to indoor ventilation. Scientific research has confirmed that the computer screen can produce a carcinogen called brominated dibenzofuran. Therefore, it is best to install a ventilation fan in the room where the computer is placed.
8. Try to avoid being in front of the computer for more than three hours in a row, take a break in the middle.
(C) induction cooker
1. From the selection of pots and pans to start. Ideal pots and pans for induction cooker should be mainly iron and steel products, because this class of ferromagnetic materials will make the heating process heating load (pots and stoves) and induction eddy current matching, high energy conversion rate, relatively speaking, less magnetic field leakage. While ceramic pots, aluminum pots and so on can not achieve such an effect, the threat to health is also a little more.
2. In the use of attention to try to keep a distance from the induction cooker, do not lean too close. Induction cooker and microwave oven when using the precautions are similar, the closer the more likely to be radiated, usually with the induction cooker to maintain a distance of more than 20 centimeters safer.
3. Do not use the induction cooker for too long, if you often use the induction cooker for a long time, you should choose the one with the metal partition as far as possible. Because under normal circumstances, if the induction cooker is placed under the metal partition, electromagnetic radiation is significantly lower, poor isolation design or directly on the desktop, the amount of radiation will correspondingly increase a lot. This also requires us to buy induction cooker when we try to choose the quality assurance, design is more reasonable and safe brand-name products. An important part of purchasing an induction cooker is to ask the seller for an electromagnetic induction strength test report, through which you can compare and choose products with low field strength.
4. Kitchen facilities are also very important, in the conditions allow, you can prepare a stainless steel fiber made of anti-electromagnetic apron, prepare a pair of anti-electromagnetic radiation gloves, these small preparations can also allow you to be more secure in the kitchen.
(D) other household appliances
1. Refrigerator - refrigerator work, the rear side or the lower part of the heat pipe line release of the magnetic field is higher than the front dozens or even hundreds of times. Too much dust in the heat pipe will also have an impact on electromagnetic radiation, the more dust, the stronger the radiation.
Protection: Do not put the refrigerator in the living room and other places where people often stay. When the refrigerator is working, try to avoid getting close to it. Always use a vacuum cleaner to suck out the dust on the cooling tube.
2. Microwave oven - it is the use of microwave heat effect, through the vibration of water molecules within the food process, to achieve the purpose of heating or cooking food. 15 centimeters away from the microwave oven at the magnetic field strength of 100-300 milligauss (MG), is the strongest of all kinds of home appliances. It can induce cataracts, lead to brain abnormalities, and also affect fertility. Protection methods: to choose the products of regular manufacturers. When the microwave oven is working, it is best not to be in the same room with it; when it stops working, open it again after a minute or two. It is best to use a protective cover.
3. Electric blankets - due to the long time in close contact with the human body, will make the rest of the cells in the state of electromagnetic radiation for a long time, thus causing health disorders. There are test reports that the rate of miscarriage and other abnormalities in pregnant women who use electric blankets is higher than that of pregnant women who do not use electric blankets. Protection: Choose qualified products from regular manufacturers. Shorten the use time, it is best to use it before and after going to sleep and waking up, and avoid staying up all night. After a certain number of years of use, it is necessary to discard the old and replace it with a new one in time. Pregnant women are better off without it.
4. Television - television and other electrical appliances should not be set up too centralized, so that they are exposed to the risk of ultra-dose radiation; television and human distance should be at least 2 meters away, should not be too close to the screen; television and other electrical appliances are best not placed in the bedroom.