Can Electromagnetic Radiation Protect Textiles From Radiation Protection?

< p > is not enough attention or overreaction? With the continuous development of science and technology, electromagnetic technology has been widely applied to all sectors of the national economy.

Its application has created enormous material civilization for mankind, and has brought people into an environment full of artificial electromagnetic radiation. High voltage power grids, mobile phones, televisions, microwave ovens and even chargers have become the source of "magnetic" color change.

The importance of radiation protection is self-evident, but the driving force of commercial interests has also made some "unnecessary radiation" exaggerated to panic.

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< p > 1975, some experts predicted that with the extensive application of electronic and electrical equipment, the electromagnetic energy of urban space will increase by 7%~14% every year. If there is no corresponding countermeasure, it will pollute the living environment of mankind, especially the urban environment.

We should correctly understand the damage of electromagnetic radiation to human body, the sources of electromagnetic radiation, the degree of radiation, understand the technical characteristics of radiation protection materials, and call on the relevant departments to formally introduce the standards of electromagnetic radiation exposure limits and measuring methods, which not only can avoid unnecessary panic among consumers, but also play a positive role in promoting research and development of products targeted by production related enterprises.

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< p > < strong > preventing electromagnetic radiation should be practical and realistic < /strong > < /p >

< p > guest: Senior Engineer of the General Logistics Department Quartermaster Equipment Research Institute < a href= "http://www.91se91.com/pioneer/" > Shi Mei Wu < /a > Ph.D. < /p >

< p > reporter: how do you view the development of domestic electromagnetic radiation protection < a href= "http://www.91se91.com" > dress < /a > development? < /p >

< p > Shi Mei Wu: the development of electromagnetic radiation protection clothing in China is in a rather chaotic stage.

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< p > theoretical research is relatively scarce and parable. There are few theories about electromagnetic field theory, electromagnetic compatibility theory and electromagnetic wave leakage caused by crevice holes. We often see the shielding mechanism of electromagnetic waves with metal conductors to illustrate the electromagnetic shielding mechanism of metal containing textiles or localized metallized textiles. The most important part of the research is the lack of leakage and cut-off frequency of electromagnetic waves in the garment structure.

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< p > high level electromagnetic radiation protective clothing, such as shielding effectiveness of 40dB and 50dB, has not yet been produced in our country. The medium level electromagnetic radiation protective clothing is rare. A large number of electromagnetic shielding suits are widely flooded with the market.

At present, the protective clothing with lower shielding effectiveness used by enterprises is made in China.

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< p > reporter: what is the guiding significance of the final establishment of electromagnetic radiation exposure limits and measurement methods for the development of the industry? < /p >

< p > Shi Meiwu: the limits of electromagnetic radiation exposure are the basis for determining whether occupational or public protective clothing should be protected in the electromagnetic field of different field strength and shielding effectiveness.

Since 1988, China has drafted 6 national standards on electromagnetic radiation by the Ministry of health, the State Environmental Protection Administration and the Ministry of electronics.

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A unified national standard draft for electromagnetic radiation exposure limits and measurement methods was issued in P 2007. However, due to their respective business and academic viewpoints, the ministries and commissions could not unify the final standard draft.

The army has made 7 electromagnetic protection standards since 1984.

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< p > aiming at the problem of long and confused contents, the General Armament Department took the lead in merging the original 7 national military standards and redefined the "exposure limits" to form the GJB5313-2004 electromagnetic radiation exposure limits and measurement methods.

On this basis, GB/T was released in 2009.

23463-2009 protective clothing microwave radiation protective clothing standard.

The promulgation of electromagnetic radiation exposure limits and measurement methods provides a basis for professionals and the public to wear electromagnetic shielding and protective clothing.

For enterprises and industries that produce electromagnetic radiation protective clothing, they also have guiding significance for technical requirements.

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Reporter: when it comes to the development trend of electromagnetic radiation protective clothing, you have mentioned a large number of electromagnetic radiation protective clothing fabrics, a large number of concave electromagnetic radiation protective clothing fabrics, silver plated fiber products and so on. What are the problems faced by domestic enterprises in the development and application of these fabrics? What aspects should we continue to work hard? < /p > p

< p > Shi Meiwu: < a href= "http://www.91se91.com/news/index_c.asp" > fiber > /a > a large number of tiny pits on the surface are designed to improve the adhesion fastness of the metal coating to the fibers.

A large number of holes in the fabric are designed to improve the permeability of electromagnetic radiation protective clothing.

Under the premise of controlling the hole size of the fabric, it is possible to ensure that the electromagnetic wave of the specific frequency band that needs to be protected has enough shielding effectiveness, and solves the problem of excessive thermal load of the human body caused by the whole body sealing of the electromagnetic shielding protective clothing with high shielding effectiveness.

These technologies are mature and have intellectual property rights.

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< p > the electromagnetic radiation protective clothing produced by domestic enterprises is similar and is in a state of homogenization competition.

We should focus on more reasonable structural design, give consideration to various functions, and give consideration to effectiveness and comfort. We should design electromagnetic shielding suits with different shielding effectiveness levels to meet different shielding effectiveness requirements determined by electromagnetic field intensity and exposure limits.

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< p > reporter: is it necessary to popularize electromagnetic radiation protective clothing to civilian areas? < /p >

< p > Shi Meiwu: I personally do not agree that the electromagnetic radiation protective clothing should be extended to the civilian field.

The electromagnetic radiation exposure limit is also the basis for determining whether the public life area is safe.

Under the control of environmental electromagnetic field standards, the electromagnetic environment of public living areas is safe, and there is a great safety factor when formulating the exposure limits.

At present, there is no public opinion about the spread of electromagnetic pollution in the society. There are even some commercial intentions. I think it is irresponsible to extend the electromagnetic radiation protective clothing to civilian use.

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< p > the prevention and control of electromagnetic pollution must first be "active protection", that is, shielding and isolating the electromagnetic radiation sources; for professionals, the "passive protection" method should be adopted when necessary. For example, soldiers should repair radars urgently on the battlefield, so they can only wear protective clothing and rush into the radar location where they are not allowed to enter under normal circumstances.

Under normal circumstances, people are not allowed to enter the radar location, that is, "active protection" measures.

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P > in addition, according to foreign practice, pregnant women, if they are working in a radiation environment, can be pferred to public environmental work. In public environment, the elderly, children or pregnant women are a protective standard, and pregnant women do not have a more stringent protection standard.

That is, living and working environment is the environment for pregnant women to survive. On electromagnetic radiation protection, there is no standard for pregnant women to be treated differently.

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< p > < strong > related links < /strong > < /p >

< p > < strong > > the Ministry of health, the State Environmental Protection Administration and the Ministry of electronics have drafted 6 national standards on electromagnetic radiation: < /strong > /p >

< p > > the Ministry of health has formulated the occupational exposure limits of high frequency electromagnetic fields in GB18555-2001 workplaces, the hygienic standard of power frequency electric fields in GB16203-1996 workplaces, the hygienic standards for ultra high frequency radiation in GB10437-1989 workplaces, the hygienic standard for microwave radiation in workplace, the hygienic standard for electromagnetic waves in GB9175-1988 environment, the regulations of GB8702-1988 electric field radiation protection formulated by the State Environmental Protection Administration, and the methods and standards of HJ/T10.3-1996 electromagnetic radiation environmental impact assessment and HJ/T24-1998 for environmental protection.

500kV technical specification for electromagnetic radiation environmental impact assessment of EHV pmission and pformation engineering; radiation safety requirements of GB12638-1990 microwave and ultrashort wave communication equipment developed by Ministry of Electronics < /p >

< p > < strong > the army has formulated 7 electromagnetic protection standards since 1984: < /strong > /p >

< p > GJB7-1984 microwave radiation safety limits, GJB475-1988 microwave radiation living area safety limits, GJB476 living area microwave radiation measurement method, GJB1001-1990 operation area ultrashort wave radiation measurement method, GJB1002-1990 ultra short wave operation area safety limit, GJB2420-1995 ultrashort wave radiation life zone safety limit and measurement method, GJB3861-1999 short wave radiation exposure limit and measurement method.

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< p > < strong > clarify the different radiation effects and establish the relevant quality system < /strong > < /p >

< p > < strong > professor Wang Qun, director of the national accreditation Laboratory for electromagnetic protection and detection, Beijing University of Technology, < /strong > /p >

< p > besides the radiation of nature, the artificial electromagnetic radiation comes from several aspects such as power system, broadcasting and television system, medical equipment, communication base station, aircraft, railway and so on.

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< p > from the environment, such electromagnetic pollution is segregated, and the relevant employees are only close at work. In the small environment, radiation protection clothing is needed to protect the environment, such as occupation needs, or the use of computers, cell phones, microwave ovens, etc.

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< p > this involves the necessity of wearing protective clothing and wearing protective clothing. I think we should look at it from three aspects: < /p >

< p > first, whether there is any pollution source, electromagnetic oven and microwave oven all have radiation. Whether it damages the human body depends on whether there is any leakage. Regardless of the environment of high-voltage lines, radars, communication base stations, or mobile phones, TV and other living environments, we have scientifically assessed the extent of electromagnetic radiation pollution through measuring instruments and technical handpieces. Not such equipment has a high degree of pollution, such as home furnaces, microwave ovens, depends on whether there is radiation leakage, and whether it reaches a certain limit.

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< p > secondly, whether or not to use electromagnetic shielding clothing depends on the psychological factors of consumers.

This part of the consumer belongs to "non occupational needs", but the radiation from computers, mobile phones and other aspects has left them with a lingering fear. In addition, the publicity on electromagnetic pollution has made this group of people, especially pregnant women, only feel comfortable when they wear the so-called radiation protection clothing.

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< p > finally, when it comes to the effect of protection, it can not be generalized.

Some fabrics themselves have radiation protection functions, but if they are not properly handled in the process of garment processing, they still can not play a role.

Therefore, the application methods of fabric and technology should also be appropriate.

Due to the development of communication function, information pmission has gradually changed from wired to wireless, and optical fiber pmission has gradually become the main way. Therefore, I think that electromagnetic radiation resistant textiles need to be extended to civilian areas. Of course, this kind of "radiation protection" can not be conceptual.

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< p > as for how to define whether the electromagnetic radiation resistant textiles are qualified, we can only give some reference data of the electromagnetic pollution degree as the EIA agencies. We expect that the relevant departments of the state can set up a perfect quality inspection system, set up certain threshold and standardize the market, and let the product testing have evidence to follow.

With rigid indicators, we can not only better define the product's qualification, but also help protect the development of the industry and the interests of the enterprise.

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< p > < strong > Shandong fertile source new fabric Co., Ltd. < /strong > /p >

< p > at present, the company has advanced electromagnetic shielding materials and electromagnetic compatibility materials specialized production line. The annual output of metallized textiles is more than 600 thousand square meters. The main products are copper plated and nickel plated fabrics. Through technological innovation, the weight of these fabrics is lighter and the wrinkle resistance is improved.

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< p > because the market is not very well aware of electromagnetic radiation shielding textiles, our products are mainly directed in the field of national defense, and the output is not very large.

For enterprises, we hope that such products can be applied to the civilian field, and now we are gradually developing silver plated fabrics for consumer groups such as radiation proof maternity dress.

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< p > to further enhance the production capacity of enterprises, the key is to increase production efficiency. In fact, many technologies in the field of electromagnetic radiation prevention can be done well in China, which is not worse than abroad, but there is still a lack of technology control and application in the production process, which leads to the best product quality.

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< p > < strong > electromagnetic wave damage to human body < /strong > /p >

< p > electromagnetic radiation damage to human body is derived from < /p >.

< p > thermal effect non thermal effect accumulation effect < /p >

< p > the target organs of electromagnetic waves are mainly sensitive organs such as eyes, reproductive organs, brain, heart, thyroid and so on.

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< p > the slight damage of electromagnetic radiation to human body is usually characterized by feeling fatigue, memory loss, insomnia, dreaminess, alopecia, dizziness and so on.

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Strong long-term effects of high frequency electromagnetic fields may also lead to serious injuries such as cataract, leukemia, brain tumors, cardiovascular disease, brain dysfunction, and abortion and infertility in women, and even lead to low immune function in humans, leading to cancer and other pathological changes.

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< p > except for the damage caused by the extremely strong electromagnetic wave to the human body, the electromagnetic radiation, even slightly higher, under the exposure limit has not been fully proved to be harmful to human body, especially the low-frequency magnetic field.

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< p > WHO and ICNIRP think that the electromagnetic wave is different from the ionizing radiation such as X rays and gamma rays on the human body. The frequency of electromagnetic wave is lower than that of visible light, and its harm will not reach the degree of "radiation". It is suggested that the term "radiation" should not be used to describe the electromagnetic wave so as not to mislead the public into excessive fear. It is suggested that the word "exposure" be used to describe the human body under electromagnetic radiation. This idea has been popularized worldwide. In 2004, the GJB5313 "electromagnetic radiation exposure limit and measurement method" issued by the General Armament Department has already reflected this idea.

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< p > < strong > the frequency and intensity characteristics of electromagnetic pollution < /strong > < /p >

< p > electromagnetic pollution sources include natural electromagnetic pollution sources and < /p >.

< p > < strong > artificial electromagnetic pollution source < /strong > /p >

< p > Open pollution sources: radar, radio and television pmitting equipment, communication base stations, electromagnetic processing machine tools, medical instruments, scientific research equipment, high-voltage power equipment, etc.

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< p > closed pollution sources: microwave oven, microwave heating equipment, communication equipment and so on.

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< p > electromagnetic pollution source frequency characteristics < /p >

< p > power frequency: pmission line and electric traction system < /p >

< p > Radio Wave: industry, science, medical equipment < /p >

< p > microwave (300MHz to 300GHz): microwave oven, microwave relay communication, satellite communication, mobile communication pmitter, radar and so on.

However, the frequency of practical application is about 100GHz, which is less than 40GHz, and is generally less than 10GHz.

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The pollution level of high voltage lines, communication base stations, mobile phones, televisions and so on is believed to be serious. Some people have proved that they are basically in line with the standards. These different understandings and concepts have different sources: < /p > P.

< p > stems from professional researchers' normal debate on science and technology; < /p >

< p > from different standpoints, different understanding and value orientation of electromagnetic radiation protection are generated by different occupational groups; < /p >

< p > people and professionals do not understand the theory of electromagnetic radiation and damage theory; < /p >

< p > stems from some media's irresponsible alarmist voice to attract eyeballs; < /p >

"P" stems from commercial interests, such as the production and sale of pregnant women's belly pocket businesses, which publicize that almost all kinds of electrical appliances are harmful.

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< p > WHO WHO International Cancer Research Institute (IARC) points out: < /p >

The results of animal studies in < p > laboratory did not show that there was a consistent relationship between low-frequency magnetic field and carcinogenesis or cancer promotion; < /p >

At the same time, there was no scientific explanation for the association between the increased risk of childhood leukemia and the low frequency magnetic fields in the living room. P

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In view of the weakness of the evidence, WHO's international electromagnetic field plan and the International Cancer Research Institute believe that: < /p > P.

< p > DC magnetic field and DC and extremely low frequency electric fields are "not classified as carcinogenic"; < /p >

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The International Cancer Research Institute classified the power frequency magnetic field into the weakest possible carcinogenic group (group 2B) according to the three types of potential carcinogenicity classification, which is divided into the same group with coffee and pickles.

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