The so-called electromagnetic radiation, is the propagation of alternating electromagnetic fields in space, electromagnetic wave frequency regardless of size, there is radiation. Such as residential electricity frequency of 50 Hz, is a low-frequency, go up is the radio long-wave, medium-wave, short-wave, ultra-short-wave, followed by microwave ovens and infrared and so on, but the frequency of these electromagnetic waves are not as high as the natural world of visible light, and usually its radiation on the human body is not a big impact. Even high-frequency electromagnetic waves such as ultraviolet light are both beneficial and harmful to the human body, the key lies in the scientific use. For example, ultraviolet light, long-term exposure to excessive radiation is likely to induce skin cancer, but moderate exposure to some benefit, X-ray in the application of medical treatment is also the same.
In terms of electromagnetic radiation, in addition to the frequency of high and low, there is a difference between the strength of the same frequency of electromagnetic waves, with the intensity of the increase in the harm caused by some of the relative harm, and the situation of each individual life is also very different, electromagnetic radiation on the results of its impact is not the same.
In order to prevent electromagnetic radiation pollution, some people have come up with a lot of "tricks", such as do not put too much concentration of household appliances or often used together, especially TV, computers, refrigerators should not be centrally located in the bedroom, so as not to expose themselves to long periods of time in the environment of the overdose of radiation; a variety of household appliances, Office equipment, cell phones should try to avoid prolonged operation; the use of a variety of high-power appliances, it is best to maintain a certain safety distance, suspend the use of the best not to let them be on standby, because a long time on standby will also produce an accumulation of radiation; cell phone connected to the moment of the release of electromagnetic radiation is the largest, it is best to ring over one or two seconds or between two ringtone to answer, the use of the head and the cell phone antenna as far away as possible, it is best to use a separate headset. The best use of separation headset, and so on, there is the use of protective clothing, radiation screen or radiation shield.
The harm caused by electromagnetic radiation pollution, is a subtle process, never overnight will show up, but this should not be taken lightly, to be based on prevention, especially active prevention, in order to reduce the harm it may cause to the human body. For example, for cell phone holders, the cell phone's transmit power is much greater than the receiving power, so manufacturers can use shielding materials on its key transmitting components, the cell phone antenna can also be taken to directional emission (at present, the domestic has been successfully developed by scientific workers directional emission antenna), other household appliances can be shielded from the relevant components of the electromagnetic radiation from the source of the source of the control, try to reduce the amount of space radiation. Space radiation. At the same time, to improve the reception sensitivity of various electronic devices or instruments, so that the power of electromagnetic waves can be relatively small, electromagnetic radiation pollution will be reduced.