The harm of electromagnetic radiation to human body is caused by the energy of electromagnetic waves. The transmission frequency of mobile phones used in China is between 800 ~ 1000 MHz, and the radiation dose can reach 600 microwatts, which is more than 0/0 times of the national standard/kloc-0. Excessive electromagnetic radiation can cause neurasthenia, loss of appetite, palpitation, chest tightness, dizziness and other "electromagnetic wave allergy".
There are many examples of the harm of electromagnetic wave pollution to human body, but the degree of its influence is related to the radiation intensity and the length of accumulation time, and it has not been widely reflected at present, so it has not attracted people's general attention.
Relevant research shows that the pathogenic effect of electromagnetic wave increases with the increase of magnetic field vibration frequency, and the frequency exceeds 65438+ 100000Hz, which may pose a potential threat to human body. Working and living in this environment for too long, the human body is disturbed by electromagnetic waves, which changes the original electric field of molecules in the body tissue and leads to the disorder of the ecological balance of the body.
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There are two ways to interfere with the propagation of electromagnetic waves:
One is conducted interference, which is the interference caused by the current propagating along the power line;
The other is radiation interference, which is caused by the emission of electromagnetic waves into the surrounding space.
In order to prevent and suppress electromagnetic interference, reasonable circuit design, filtering, shielding and other technical methods are mainly adopted. Reasonable circuit design is to arrange components and circuits reasonably in a narrow space, which can weaken parasitic electromagnetic coupling and suppress electromagnetic interference.
A filter is a circuit composed of resistors, inductors and capacitors. This network can allow signals of some frequencies to pass, while preventing signals of other frequencies from passing. The correct design and installation of the filter can minimize electromagnetic interference.
As a basic means to suppress electromagnetic radiation, shielding technology has been widely used. The purpose of shielding is to limit radiation energy to a specific area or to prevent radiation energy from entering another specific area. Shielding material is the key to shielding efficiency. The newly developed absorbing materials have come out, which will contribute to the development of clean space for human beings.
In addition to the above technical methods, other methods can be used to reduce the harm of electromagnetic radiation pollution, such as prohibiting the establishment of high-power wireless paging stations around the airport and taking good shielding and protective measures for staff who often contact RF equipment.
Baidu encyclopedia-electromagnetic wave