Radiation Protection Clothing Storm

CCTV's report has triggered a battle of words, but the core of the problem is not whether the shielding clothing is useful, but whether the electromagnetic environment of our daily work and life is safe.

In any case, this dispute is bound to speed up the formulation and implementation of relevant industrial standards.

A news from CCTV will push the industry of the Shanghai anti electromagnetic radiation Association, which has only been established for more than half a year, to the cusp of the storm.

In December 17th, CCTV's "Truth Investigation" column conducted a test on the hot radiant clothing on the market. The result shows that the radiation protection clothing can not only reduce electromagnetic radiation, but it will.

In December 22nd, the Shanghai anti electromagnetic radiation Association held a media statement in Beijing to respond to the matter, and claimed that CCTV's experiment was not rigorous.

What is the truth?

Radiation fraud?

In October 30, 2011, a netizen asked micro-blog in the famous dummy Fang Fang Zhou, "is there any scientific basis for the clothes sold by the pregnant women in the market for more than 600 yuan radiation protection? Please enlighten us."

Fang Zhouzi responded, "as I said before, this is a unique commercial fraud in China.

The electromagnetic radiation generated by daily electrical appliances has no effect on human health, even if there are

I wonder if CCTV reporters have been inspired by Fang's micro-blog. In CCTV's December 17th program "Truth Investigation", we made an experiment on radiation protection clothing.

CCTV reporter "through the recommendation of the Chinese Academy of Sciences has found a domestic leading professional electronic testing laboratory, the radiation protection ability of a metal fiber radiation protection clothing has been tested."

In the program, engineer Chen Feng made two small experiments. The first experiment was to test the barrier ability of radiation protection clothing to single electromagnetic wave.

The experiment is simple. Chen Feng uses a pmitting antenna and a receiving antenna to establish a signal pmission path.

After calibrating the instrument, Chen Feng blocked the radiation protective clothing in front of the receiving antenna.

The instrument displays 9 of the filtered signal, which means that it can block 90% of the radiation.

"But the problem is that radiation sources in real life are not single, and they are not in the same direction.

In the face of complex reality, is there any effect of radiation protection clothing? "Facing the reporter's question, Chen Feng conducted second experiments on radiation protection to test the radiation resistance of radiation protection clothing in complex electromagnetic environment.

This time, the radiation protection clothing is covered on a shelf and then subjected to radiation from many sides.

Chen Feng put the detector into the interior of the radiation protective clothing. The result shows that the radiation peak inside the radiation protection clothing is enhanced.

According to the principle of electromagnetic radiation, if radiation is not exposed to radiation suits, the body will absorb a small part of the radiation and then reflect most of the radiation.

But if you wear a radiation proof clothing, the radiation will be injected from all the gaps at the bottom and cuffs of the clothes, but it can not be reflected. Instead, the radiation will be subjected to repeated reflection and overlap after radiation. The radiation intensity will increase on the human body.

Chen Feng explained this result.

Only when a person wears a fully enclosed space like a spacesuit.

At the end of the program, CCTV interviewed a popular science writer, the thin camel, who was a nutshell. The latter said that an article published in a medical authoritative magazine in 1991 showed that daily radiation did not cause harm to the human body.

Over the years, there has been no renewed view in academia to overturn this conclusion.

"The pregnant women's radiation proof clothing in the market is not effective against radiation. Besides, daily radiation does not cause harm to the human body."

This short 5 minute program finally conveys this message to us.

It can be imagined that the broadcast of the program caused a great uproar, and at the same time pushed the radiation protection clothing industry to the whirlpool of public opinion.

In response to the market, many consumers demand to return products. Some department stores also require products to go off shelves. What's more, a consumer in Tianjin will take a radiation protection clothing company to court, for the reason is fraud.

"The" electromagnetic radiation prevention service incident "has caused a great impact on the entire electromagnetic radiation industry.

Shang Sishan, Secretary General of Shanghai electromagnetic radiation Association, said.

Quest for truth

In nature, radiation can be broadly divided into two types, one is high-energy ionizing radiation, such as X light or nuclear radiation in hospitals. Ionizing radiation is harmful to human body. The other is non ionizing radiation, namely electromagnetic radiation. Excessive electromagnetic radiation is dangerous to human body.

China's research on electromagnetic shielding clothing began in the 60s of last century, and mainly focused on the field of military research, medical and health.

Until 90s, with the popularity of household appliances and the progress of textile technology, the civilian anti electromagnetic radiation clothing began to put into production, which is the hot radiation proof clothing on the market now.

But is there any need to wear radiation protection clothing in daily life?

There are different views on this issue.

Thin camel said that unless the industrial sector's X light will cause great damage to the human body.

Under normal circumstances, the use of computers, cell phones, induction cooker and other electrical appliances have little effect on the human body.

Professor Liu Wenkui, an expert on electromagnetic radiation research in China, said: "since twentieth Century, electromagnetic technology has been developing rapidly, and the application of electromagnetic technology is also widespread in all fields.

This also leads to more and more electromagnetic fields in the space environment, and more and more complex, forming electromagnetic pollution. If a person is in an excessive electromagnetic field for a long time, and is very close to the radiation source, it will definitely affect the health. "

At the same time, relevant experts have put forward more pertinent opinions.

Wang Sumei, deputy director of Obstetrics and Gynecology of Beijing Chaoyang Hospital, told reporters that electromagnetic radiation in daily life would not cause too much impact on the human body, but pregnant women should be aware of far away from some strong radiation appliances as a sensitive group, such as using less mobile phones, away from the microwave oven that is working, and so on.

Since sensitive people need to pay attention to the protection of electromagnetic radiation, will wearing protective clothing be counterproductive?

Shortly after CCTV broadcast, nearly 60 brands of anti radiation brands such as plus and October mom sent samples to Shanghai metrology and Testing Technology Research Institute and East China National Metrology and testing center.

In December 22nd, the Shanghai Association for the prevention of electromagnetic radiation held the "anti electromagnetic radiation media briefing meeting" in Beijing for the first time to make a public response to the problem.

It is universally acknowledged that "the human body absorbs electromagnetic waves and produces thermal effects."

Whether there will be non thermal effects and whether non thermal effects will have an impact on human health has not yet reached a unified conclusion internationally.

Lv Yinghua, Professor of China Post and telecommunications university, said, "but for some sensitive people, such as pregnant women, they should try to minimize exposure to electromagnetic sources, and take appropriate shielding measures such as wearing radiation proof clothing to reduce the intensity of electromagnetic radiation, which will be beneficial to them."

Why does Chen Feng show that radiation protection is enhanced by wearing radiation protection clothing?

Li Guodong, senior engineer of Shanghai Institute of Metrology and testing technology, said: "he (Chen Feng) is putting the radiation protection clothing on a shelf, and the gap between the clothes and the shelves is very large. This leads to many electromagnetic waves coming into the interior from larger gaps, reflecting continuously inside, but if people are wearing, electromagnetic radiation coming into the radiation protection clothing from the cuffs and other crevice is very small, and the energy in every reflection of the clothes will be reduced to heat until the radiation disappears. This part of the heat will be absorbed by the human body, but it is harmless to the human body."

In addition, he also said that the test of electromagnetic radiation should be carried out in a professional elliptical enclosed electromagnetic dark room.

"This will make the electromagnetic field of the space more uniform and conform to the standard of the test."

"But where is Chen Feng experimenting? He is experimenting in ordinary rooms, stacking instruments indoors, and distributing electromagnetic fields in a mess".

Li Guodong believes that this is another reason why Chen Feng's experimental data are not scientific.

Therefore, the Shanghai Association for the prevention of electromagnetic radiation believes that Chen Feng's experiment is based on the results of non professional methods in non professional occasions by non professionals. We can tell consumers responsibly that electromagnetic shielding clothing is effective for shielding electromagnetic waves.

It is an extremely irresponsible act to issue the so-called anti electromagnetic radiation service as a commercial scam.

In response to the Shanghai Association for the prevention of electromagnetic radiation, Chen Feng labs recently launched blogs and micro-blog, saying: "what is specifically emphasized in the news is only a special experimental setup, which is the reflection of electromagnetic waves entering the shielding clothing. It is absolutely not that the energy of signals has increased.

This is a relative value, which is the comparison of the front and rear power of the receiving antenna. "

As for the problem of "radiation protection clothing may be worse than without wear," Chen Feng Bowen said, "although this situation is rare, it is possible that two extreme experiments are presented to describe this situation". He also acknowledges that "the experiment in the program is not rigorous" and "there is no standard experimental conclusion".

Since the daily wear of radiation protection clothing will not enhance the radiation, is the radiation shielding effective for shielding electromagnetic radiation?

People in charge of Shanghai's electromagnetic radiation Association say that the radiation protection clothing on the market is mainly composed of two kinds of materials, metal fiber and silver ion, which can effectively shield electromagnetic radiation.

Lu Fumin, chief engineer of Shanghai Institute of Metrology and testing technology, said: "we have carried out electromagnetic radiation tests on many brands of pregnant women's radiation protection clothing, including sling, vest and so on. We found that the radiation protection clothing on the market can cover most of the electromagnetic radiation.

During the experiment, we found that the radiation protection clothing for pregnant women mainly protects the heart part of the pregnant mother, the belly part (that is, where the baby is), and the effect on the edge part will be weak. Moreover, the protective effect is closely related to the fabric and style of the garment.

Standard torture

Shortly after responding to the electromagnetic radiation Association of Shanghai, some netizens quipped: "after finishing food experts and chemical experts, this time, the problem of radiation protection clothing has forced many people to learn physics experts."

In fact, the CCTV public found that the problem was "fair and fair", and the Shanghai anti electromagnetic radiation Association responded to the problem.

Most consumers do not have excellent physical knowledge. For consumers, Chen Feng's experiment is not rigorous, and Shanghai's claims are not credible.

The reason for this is the lack of industry standards.

Radiation and radiation medicine, Military Medical Science Academy of the PLA

In fact, with the development of society, all kinds of household electrical appliances come into our lives and work. According to statistics, the average household appliances in China are 26, and the radiation environment that people face everyday is also relatively complicated.

In 1988, the state approved the implementation of the "electromagnetic radiation protection regulations", marking the limits of electromagnetic radiation protection, the management of electromagnetic radiation sources and the matters needing attention in electromagnetic radiation monitoring. In 2009, the recommended standard of microwave shielding and protective clothing was also issued.

Huang Jianhua, spokesman for Shanghai electromagnetic radiation protection association, said: "in recent years, the relevant departments of the state have done a lot of work in the standardization of radiation protection textiles, and many related standards have been worked out on yarn, fabric, testing methods, occupational radiation protection clothing, and so on.

These standards have become the main norms in the product design, R & D and production of enterprises in this industry. "

But the problem is that although the electromagnetic radiation protection regulations have standard radiation for each electrical apparatus, there is no corresponding standard and detection for the amount of radiation accumulated after a large number of electrical appliances are concentrated in a room. The recommended standard for microwave shielding protective clothing is not a compulsory national standard for the whole anti radiation product.

That is to say, the radiation proof clothing on sale in the market is still in the condition of standard vacancy.

It is reported that the standards of radiation protection products on the market are determined by the production enterprises themselves, and the standards set by each enterprise are different.

As the market expands year by year, many enterprises maliciously exaggerate the influence of radiation, and the product material effect is seriously inconsistent with exaggerated propaganda, resulting in the current market competition in the radiation protection clothing industry is in a state of disorder and disorder.

As a functional clothing product, the radiation protection clothing merchants advertise that "ordinary metal fibers can withstand 99.99% of the radiation, while silver ions can withstand up to 99.9999% of the radiation". However, because there is no relevant department's supervision and testing, the effect is really as businessmen say, no one can say clearly.

"Before the unified national standards were promulgated, industry competition became more chaotic, and consumers became confused."

Liu Ruohua, an associate professor of materials at Donghua University, hopes that the emergence of disputes will at least improve the quality of the industry.

People hope that the introduction of standards can solve the key problems such as "how much electromagnetic radiation is harmful to the human body", "what kind of situations should wear radiation protection clothing" and "specific requirements of radiation protection clothing products" and so on, so as to fundamentally solve similar disputes, and standardize and guide the radiation protection clothing industry to develop healthily and orderly.

Therefore, whether from the radiation protection clothing industry itself or from the consumer perspective, the formulation of relevant industry standards is imperative.

Regarding this, Gu Hongfeng, an expert member of the national garment Standardization Technical Committee, said, "the standard of radiation protection clothing is being drafted, and now it is a technical research stage. It also requires all parties to demonstrate and discuss, and the relevant departments are formulating professional parameters. After the agreement has been reached, it will be officially released by the State Council."

In any case, this dispute is bound to accelerate the formulation and implementation of relevant industrial standards, and will be a new start for the radiation protection clothing industry.