Electromagnetic radiation hazards and protection

Not only mobile phones, but also some other common home appliances and office supplies also have electromagnetic radiation. For example, VCD will produce radiation with a frequency of 27 MHz and its integral multiple frequency. Some manufacturers use metal foil to cover these radiation-free parts to reduce radiation. Both the TV screen and the internal local oscillator also produce radiation. In contrast, the radiation in front of the screen is much smaller than the standard, and the radiation generated by the local oscillator is much worse. These local oscillators have a high frequency of radiation, which is 37 MHz higher than the frequency of television receivers, and its frequency of two and three times. The commonly used computers have a wider spectrum of radiation. For this reason, the Federal Communications Commission (FCC) of the US requires that digital circuits must be tested to five times the frequency of their clocks. In life, there are often people playing video games next door where the TV can receive. Therefore, in some confidential departments to prevent leakage due to electromagnetic radiation, the computer is placed in a shielded room made of metal plates (or nets).

Microwave ovens, which have long since entered most home kitchens, also suffer from electromagnetic radiation. The microwave oven uses a frequency of 2450 MHz, which belongs to the microwave band. The microwave leakage energy has been a concern of consumers. According to the provisions of the microwave and Shanghai standards, the microwave leakage power of the microwave oven at a distance of 5cm from the door must not exceed 5mW/cm2. The actual measurement results of the microwave ovens of various brands indicate that the new microwave oven generally has a microwave leakage power of 300 to 500 on the upper and lower sides of the door. / Square centimeter, the leakage on the left side of the door (door axis) is relatively large, close to 1mW/cm2, and at the observation window of the door is about 600 (W/cm2. Although these data are much smaller than the microwave oven's international regulations, However, it exceeds the safety zone value (10 (W/cm 2 )) in the GB9175-88 environmental electromagnetic wave hygiene standard. Therefore, when using a microwave oven, we should not close our head to the observation window or the door seam. It has been used for some time. In the deformed microwave oven, its microwave leakage is certainly greater.

At present, the research on the harm of electromagnetic radiation generated by these household appliances and office supplies is not deep enough, and there are differences in their views on the harm. However, one thing is certain: If people are in this environment for a long time, it will definitely be harmful, especially for people who work at a long time and use mobile phones on a computer. Because the computer is close to the human body and the daily contact time is long, the mobile phone clings to the human ear. Therefore, more attention should be paid.

So what to do? Obviously, we must not waste our food because we cannot abandon the crystallization of these human scientific and technological civilizations because of electromagnetic radiation. We can only adopt positive preventive measures. We cannot wrap the foil outside the computer or outside the cell phone. Some people use the method of placing the eye protection net in front of the computer, but the test shows that the eye protection net can only attenuate 1% of the ray radiation, and the shielding effect on electromagnetic radiation is not very large. Moreover, the largest part of the computer radiation is not in front but behind it. . For mobile phones, the shielding film can only reduce electromagnetic radiation that enters the brain through the human ear, and the internal organs of the user are still exposed to electromagnetic radiation. The best way is to wear an anti-electromagnetic radiation shielding suit.

As early as the 1970s, people dressed in such clothing in scientific research, production, and military units with large radio-radiation power. It consists of two layers, the face of which is a common fabric and a metal wire mesh woven from fine copper wire. This clothing has good shielding properties, but its wearing comfort is poor. Later, some radiation-proof fabrics appeared one after another, but some reflected electromagnetic waves. There are major differences in electromagnetic wave performance at different frequencies and locations. The ideal anti-electromagnetic wave shielding cloth should not only be comfortable to wear, but also have good shielding effect, but also can absorb electromagnetic waves, so that the radiation protection performance is also stable. At present, there are such radiation protection products on the market. When consumers put on such protective clothing when using a computer or mobile phone, the harmful effects of these harmful electromagnetic radiation on the human body are greatly reduced.

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