Not long ago, the Danish middle school students published a message saying that WiFi radiation affected the germination of cress seeds. For a time, "electromagnetic radiation affects health" has once again triggered heated debate. Nowadays, there are more and more electric appliances in people's homes, from small items such as refrigerators, TVs, computers, to small parts such as mobile phones, wireless routers, and tablets. They have more or less radiation in their opening and use. In this regard, many people expressed concern that these radiations have no effect on human health. There are many appliances in the home, will radiation be superimposed? Is the impact on health more complicated after stacking? With many questions, the reporter conducted an in-depth investigation.
The type of radiation should be distinguished
Mr. Guo, who lives in Tongzhou District of Beijing, is currently renovating his house. He has been thinking about the problem of laying tiles or floors on the floor. “The price of solid wood flooring is not good, and the laminate flooring is worried about the release of formaldehyde. I just decided to use ceramic tiles with my family, but I heard that the tiles have radiation, which is really a headache.†Mr. Guo complained to reporters that he was the first. I heard that tiles will also have radiation. I don’t know how serious such radiation is. After all, I have to live in the house every day. I will definitely install wireless routers and various household appliances in the future. So many appliances are stacked together and radiated. Will it be bigger?
The reporter learned that there are various kinds of radiation in the world where people live, as far as cosmic rays coming through the galaxy, as well as ultraviolet rays, nuclear fuel plants, television stations and information towers of broadcasting stations, etc. Granite stone, floor tiles, X-ray machines used in hospitals, and mobile phones, microwave ovens, etc., which people may use anytime and anywhere, have different degrees of radiation. So, among so many sources of radiation, which ones are harmful and which ones have a greater impact on people's daily lives?
According to Dr. He Xiaoxia, director of the Darwin Institute of Environmental Studies, an environmental science popularization organization, radiation refers broadly to the process of energy propagation in space. The radiation is divided into ionizing radiation and non-ionizing radiation. Ionizing radiation, including nuclear radiation, X-rays, neutron radiation, etc., is a major hazard; non-ionizing radiation, including ultraviolet light, visible light, mobile phones, computers, high-voltage lines, substations, mobile phone base stations, television broadcasts, etc., is less harmful. What is commonly referred to as "electromagnetic radiation" is non-ionizing radiation. He Xiaoxia said that because the public sometimes confuses the concept of "electromagnetic radiation" with "ionizing radiation", it will create misunderstandings and bring certain panic.
Daily radiation is not terrible
The radiation that people touch in daily life is mainly the radiation generated by electrical and electronic products, that is, the electromagnetic radiation mentioned above. Then, does this radiation have any harm or influence on the human body?
The scientific squirrel will be a well-known author, the condensed-state theory doctor "Mu right" wrote that the electromagnetic wave damage to humans, there are three simple: the first is some electromagnetic waves, it can destroy the biological protein and DNA molecules, and possibly Inducing cancer; the second is light that can be absorbed by molecules, such as visible light, infrared light, and microwaves (including radiation inside a microwave oven). If the intensity is high, it can cause burning damage to the human body; the third is high intensity. The radio wave, which can form an induced current in the human body, affecting the normal operation of the nervous system and internal organs. The radiation damage of electronic products such as household appliances, wireless routers, and mobile phones to the human body belongs to the second type mentioned above, that is, it may cause burning damage to the human body.
It is understood that the general microwave oven operating frequency is 2.45GHz, wireless network (WiFi) wireless router operating frequency is generally 2.4GHz (also 5GHz), 3G network frequency is between 1.7GHz-2.4GHz, and the signal frequency of mobile phones Between 0.8GHz and 0.96GHz and between 1.71GHz and 1.85GHz. In these frequency ranges, the radiation damage to the human body is a thermal effect. Therefore, if you do not feel your skin's fever or body temperature rise when using the above electronic equipment, you do not have to worry about the radiation in this band will damage your health. In short, in the range of electromagnetic radiation from visible light to microwave, if people do not feel that the body temperature rises too much, then there is no need to worry about electromagnetic radiation damage.
In people's daily life, the only thing that may be exposed to ionizing radiation is to go to the hospital for X-ray examination. At this time, the doctor will usually warn the patient not to get pregnant within a few months after the X-ray examination. Avoid infant malformations due to X-ray radiation.
The radiation of different appliances will not overlap
Many people are worried that they should touch so many electronic products in daily life, such as mobile phones, computers, wireless routers, cordless phones, microwave ovens, Yuba, refrigerators, induction cookers, electric blankets, hair dryers, printers, photocopiers, etc. People often have to take subways, high-speed rails and other means of transportation. Although the radiation of each electronic device is not much, but it is superimposed, will it cause greater harm to the human body?
Professor Li Liyun, a clinical oncologist at the Queen Mary Hospital in Hong Kong and a member of the Hong Kong Radiation Board, said in an interview that the amount of radiation used by people in everyday electronic devices is very small, and that the radiation of each item is different and cannot be like an apple plus. An orange is superimposed on the total weight measured. In addition, the Hong Kong Environment Bureau also said that there is no international study that believes that the use of different household electrical appliances or communication equipment, the level of electromagnetic fields generated will endanger human health.
However, there are people who worry that even if their home wireless routers are turned off when they are not in use, they should try to avoid using multiple appliances at the same time, but the situation of neighbors is not well controlled. Then, will the radiation generated by neighbors use electrical appliances enter the wall and cause harm to themselves? Will the radiation of the two families be superimposed, which will further damage health? The expert said that the intensity of electromagnetic radiation is inversely proportional to the square of the distance. That is to say, the farther the radiation source is, the smaller the impact on the human body is. The intensity of 10 meters is reduced by 10 times but 100 times compared with the distance of 1 meter.
Keep away from radiation sources to reduce radiation
At present, many people are very afraid of electromagnetic radiation. In order to avoid radiation, they will buy anti-radiation maternity clothes, radiation-proof sheets and other products specially used to shield radio waves, and also learn various anti-radiation methods, such as eating fungus radiation protection. In the house, cactus radiation protection, bottled mineral water and yogurt are used to prevent radiation. Are these radiation-proof equipment and methods really useful?
The reporter learned that so-called anti-radiation maternity clothes, radiation-proof sheets, radiation-proof gloves, radiation-proof aprons and other equipment, often by weaving metal wire in the textile to shield radio waves, which does not prevent ionizing radiation on the human body The damage can not reach the effect that the merchant claims to prevent fetal malformation. In fact, to completely shield the radiation in the microwave and radio waves that are completely harmless to people at low intensity, it is necessary to wrap the entire body in the metal. There is no scientific basis for placing cactus next to a computer to isolate electromagnetic radiation.
According to industry experts, the most effective way to reduce radiation is to stay away from radiation. Therefore, the wireless router should be placed far away from the people and away from the bedroom. Try to avoid close contact and long-term contact between the elderly, children and pregnant women. Devices such as wireless routers should turn off the power of the wireless router before going to bed at night. In addition, the wireless router should be prevented from being too close to the audio, TV, etc., to prevent these devices from interfering with each other and generating other radiation.
In addition, most laptops now have a built-in wireless network card. It is best to turn off or disable the wireless network card without using a wireless network. At the same time, when using the wireless network card to access the Internet, the laptop should not be too close to the body, especially not on the legs, and do not lie on the Internet, so as not to suffer from the radiation damage of the wireless network card. Reporter Yue Gangju
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