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The author:(作者)qqpublished in(发表于) 2014/6/7 8:51:50 4G radiation is terrible？ Hair’s terrible，
4G radiation is terrible?Hair's terrible-4G network, electromagnetic radiation, ionizing radiation, radiation-IT news 4G radiation is terrible? Hair's terrible
Recently, who lives in in Guangzhou bi GUI Park of Chen Jie somewhat bore, because work needs he just for has one mobile of 4G phone, was wanted to with this Xia Mobile Office of problem can easily fix has, can didn't thought a back home 4G signal on didn't has, to this problem he repeatedly call mobile customer service complaints, "but each other response because base station construction aspects has difficult, short time within also cannot improved signal cover of problem. "In the face of this answer, Chen Jie anger and frustration.
And he would like to experience new technology brought about by the "high" are different, in this era of increasing importance to personal health, many users did while facilitating new technologies 4G unpredictable hazards may cause doubts.
Recently, shennongjia in Hubei province had a woman for fear of 4G base station radiation will be even greater, halfway up the 35-meter-high base station Tower in protest. In Guangzhou, there are some people on base station radiation ofthe organization "demolish" operations. Such "evictions" can really protect our health? Whether creating new 4G network will produce more radiation because of the faster speeds? This time, we'll have a good talk about it now!
Classification of radiation, electromagnetic radiation not so terrible
In the existing types of radiation, is called ionizing radiation to human hurt large, sharp mobile communication base stations radiation is a form of electromagnetic radiation, in theory, does not cause harm to health
Reference to "radiation", the word many people are always scared of feeling, it is not without reason. History Shang some famous of radiation event has let people fresh, World War II times United States in Japan Hiroshima voted Xia of bomb to now also in hurt with many people, Qian Soviet of Chernobyl plant radiation leak is formed has a large no man's land, even not mention these time long of things, now network Shang spread of various "brutal" truth-wireless router next Cactus live not down, and mobile communications base station near households small disease constantly...... Radiation is enough to make many people a wide berth.
But do we really can do the radiation distance? The answer is "Nowhere". Radiation is energy in electromagnetic waves or particles (such as alpha particles, beta particles, etc) out. In General, all objects in the natural world, as long as the temperature is above absolute zero (-273.15 ° c) or more, will produce radiation. Don't say we now use induction cooker, telephone, wireless router, even we humans, was also an active source of radiation. So the radiation itself is not terrible, overdose or excessive radiation will be harmful to our health.
Depending on how the radiation intensity and different radiation scientists have long been classified. In the existing types of radiation to humans hurt the larger is called ionizing radiation, it contains examples of radiation, of course. Ionizing radiation is characterized by its ability to raise the ionizing radiation response and destruction by radiation molecular structures. Now hospitals using the CT examination, an MRI and other testing equipment, also adopts principles of ionizing radiation in order to achieve on the structure of the human body "perspective", due to their small amount of radiation, the radiation time is short, does not cause significant harm. According to experts, the ionizing radiation intensity measured in SV (Sv), 1Sv equal to 1000mSv, if the absorbed dose of ionizing radiation is below 100mSv, the body would not significantly hurt; but if radiation levels are elevated to the level of 400mSv-1000mSv, radiation produces symptoms of vomiting and dizziness, severe syncope.
Sharp mobile communications base station radiation, ionizing radiation at all, but a kind of electromagnetic radiation, is a kind of electromagnetic waves of frequencies 0-300GHz, it doesn't cause ionization, also generally does not break the molecular structure, so in theory does not cause harm to human health. In January 2006, the Institute of cancer research in London, has combined with 3 United Kingdom University of 966 1716 healthy subjects and patients with brain tumor for 4 years follow-up study, formed and published research report shows that cell phone use is not associated with the incidence of brain tumors. In December of the same year, Denmark scientists of 420,000 cell phone users followed for 21 years, said, cell phone radiation has nothing to do with cancer. In December 2008, Japan Tokyo Women's Medical University, use mobile phones comparing 322 brain cancer patients with 683 healthy people, also found that cell phone use is not associated with brain cancer. In this regard, the State radio monitoring center Liu Xiaoyong, Deputy Chief Engineer of the Centre's argument is: "Judging from the current situation, body of independent scientific experts and health concluded that, under the international electromagnetic safety standards, there is no real evidence that mobile phones, base stations of this kind of non-ionizing electromagnetic radiation harmful to the human body. ”
Base station radiation? Household appliances radiation more
Base station radiation standards set by the State power density is less than 40 microwatts/square centimeter, now performed when the construction of mobile communication base stations are less than 8 microwatts/square centimeter, in actual use, this figure may also be less
In our daily lives, electromagnetic radiation is actually widespread. In addition to being everyone "vocal opposition" of mobile communication base station radiation, widely used in modern home electronic products, such as computers, TV, microwave oven, electric oven, radio, etc, are typical sources of electromagnetic radiation, even more interesting is that of radiation generated by them is not necessarily smaller than mobile communication base stations.
According to understanding, currently international Shang General of assessment human in electric magnetic field in the by by effects of way main has two species: a is for normal using Shi distance human 20 cm within of portable transmitter products (as phone, and Pad), through than absorption rate (SAR) to found electric magnetic field strength, units usually is w/kg; another a is for normal using Shi distance in human 20 cm yiwai of fixed desktop transmitter products (as communications base station), through electric magnetic field on human irradiation of calculation to found electric magnetic field strength, Units are usually microwatts/square centimeter. "This two aspects, my developed of management standard are quite strictly, to SAR for cases, United States of standard is 1.6 w/kg, European of standard is 2.0 w/kg, and my of standard is 1.0 w/kg, in base station aspects, my of electromagnetic radiation protection standard under (GB8702-88) in the also provides has phone band of radiation irradiation limited value for day 24 hours arbitrary continuous 6 minutes of average power density for 40 micro-w/square centimeters, and United States of is 600 micro-w/square centimeters, Far away for a whole 15 times. "The introduction of such for China Mobile.
China Unicom also said, during actual communication network, taking into account the different situation exists between the base station signal is superimposed, so the actual radiation of base station operators in General would propose more stringent requirements than the standard. "Although national power density is less than 40 microwatts/square centimeter, but considering the base station signals are mutually superimposed levels, so now when the construction of mobile communication base station are to implement the regulations on electromagnetic radiation protection one-fifth standard, namely, power density is less than 8 microwatts/square centimeter, in actual use, this number may be smaller. "This person said.
This is what a concept? To hair dryer for cases, its power General in 1000 w above, due to using Shi and human of distance is near, its actual radiation can reached 100 micro-w/square centimeters of level, and also a well-known of radiation master-electromagnetic furnace, because power often in 2000-3000 w of level, in using process in the on 0.5 m within of people produces of radiation volume more is can reached amazing of 580 micro-w/square centimeters, as now city family common of wireless router, Within 1 m of the amount of radiation produced more than 60 microwatts/square centimeter.
In this regard, the Research Institute of China Metallurgical construction company limited environment test center engineers Yuan Yuming conducted a number of special tests, the test results show, part of the wireless router in nearest the radiated power density of 127.6 microwatts/square centimeter, when the distance of half a meter, the power density is still 1 microwatts/square centimeter, communication base station is almost 10 times more than double.
4G jianzhan speed-up, and radiation value-neutral
When bad reception, spontaneous enhanced power to establish opportunities and linkages between base stations. Therefore, 4G being developed high-speed network base station covers the keys, a cell phone signal, the better, smaller users are affected by radiation but will
Zhongxing communications, according to experts, the electromagnetic wave attenuation in the air so fast that electromagnetic radiation intensity is inversely proportional to the square of the distance, which means that in theory, the farther away from the base station, the human body are less affected. Such as distance increased 10 times, electromagnetic radiation is the original one-one hundredth. China Unicom in 2011 years construction WCDMA base station Shi submitted of a copies test report on displayed, in away from its test base station 12-16 m distance zhiwai of detection points get of power density only for 0.06-0.10 micro-w/square centimeters, and in distance base station 2 m zhiwai of power density is is 3.49-3.78 micro-w/square centimeters Zhijian, as in base station of are below floors, power density more is low to 0.01 micro-w/bungalows cm of level, " Mostly because base stations electromagnetic waves mainly horizontal direction and weakness evident in vertically, directly below the base station, power densities tend to be the least of the industry's version of this image, the "lamp black". "The experts saying that, in this sense, ordinary home users residing at the bottom of mobile communication base stations, without too many scruples.
That does this can be simply defined to be as far away from the base station health? No, of course not. According to the Beijing posts and telecommunications University Professor Gao Yougang introduced, people actually in the process of using mobile communication services, cell phone radiation sources is more threatening because of their proximity to the human body closer, therefore will look at reducing the phone's power is the key to reducing radiation of mobile communication. He said: "the mobile communication base station density, the higher the lower the intensity of electromagnetic radiation of each base station; mobile phone from the mobile communication base station closer to mobile phones in use to lower the amount of electromagnetic radiation from a call. "According to his tests found that mobile phone signal strength display" one ", the cell phone to send more than 1 Watt power; the signal strength display" five ", the only around 0.1 Watts of transmitting power. Based on this analysis, cities are going to "demolish" community base stations, and getting his mobile phone signal reception is not good, spontaneous enhanced power had to establish a link between the base station and instead increases the radiation hazard to itself, this is not a sensible approach.
By the same token, built by the three carriers are now high-speed 4G network, base stations covering the keys, cell phone signal reception, the better, users are affected by radiation but will smaller. "4G network transmission speed, mainly through the expansion of transmission bandwidth to achieve, it's like the Highway widening project, and base station's signal transmission power there is no direct link between them. "According to above mobile people introduced, 3G era three big operators of frequency bandwidth General in 1-5MHz level, 4G era is upgrade to has 20MHz, frequency bandwidth of upgrade let 4G of speed has has obviously of improved, but 4G base station in radiation standard Shang still to comply with national of related provides, does not is greater than 40 micro-w/square centimeters, so even base station built have more more key, also does not led to radiation volume of upgrade. According to the current 4G network well ahead of China Mobile's plan, by the end of this year, the national 4G the total number of base stations will reach 400,000, its signal coverage 3G network will be comparable. "Under such a high density network covers not only people's 4G wireless life will enjoy the convenience of anytime, anywhere Internet, and because the coverage improved, more rapidly mobile search network, and users were even smaller mobile phone radiation. "This person said.
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