When it comes to electrical appliances at home, people hear the most and worry about the most is afraid of electromagnetic pollution. In fact, electromagnetic radiation is very common in the home, because similar coils of electronic components in home appliances are widely used. It is not an exaggeration to say that there are electromagnetic coils in the work of the object have radiation, just the size of the radiation, whether it is shielded from the problem.
When it comes to electromagnetic radiation, the first thing that comes to mind is microwave ovens and induction cooktops. For microwave ovens, the outside of the body usually has a complete metal shell as well as a micro-thin protective plate. In addition, microwave ovens have protective locks on the sliding doors, so the microwave leakage to the outside is relatively limited. Also, when using a microwave oven, it is rarely necessary for someone to be close by to keep an eye on the food, so there is less danger to people.
In contrast, induction cooktops are much more open to electromagnetic radiation. Induction cooker in the working process will produce very low frequency electric field and magnetic field, due to the metal heating object is separate, so the amount of electromagnetic radiation than ordinary home appliances electromagnetic radiation dozens of times or even hundreds of times higher, but the good thing is that the induction cooker is upward radiation, in other words, as long as the induction cooker side of the shielding is safe and effective, and the operator to maintain a certain distance from the side of the normal use of the words, there is no problem. However, induction cooktops require people to stay close when using them, so the radiation it produces is much greater than that of TVs and computers.
Because there is no standard for extremely low-frequency electromagnetic fields in China, there is no way to know how much radiation is emitted by induction cookers on the market. Chinese Center for Disease Control and Prevention Radiation Protection and Nuclear Safety Medicine Professor Zhu Changshou told reporters that radiation can be broadly divided into two categories of ionizing radiation and non-ionizing radiation, in addition to radiation belonging to ionizing radiation, most of the face of our home is non-ionizing radiation, and non-ionizing radiation in the high-frequency radiation has the greatest impact on the person.
Television pollution diversification
Speaking of television, television radiation pollution is a long time. In people's traditional concept, the traditional CRT TV pollution "power" the most "deep", because it not only has electromagnetic pollution, more ray pollution and light pollution problems.
People who have dismantled the TV know that CRT TV in the back of the cathode ray cavity outside a large lead shell. Why are televisions the top of the e-waste list? It's because every CRT TV has a lead block structure. And the reason why this structure has to be used is to prevent the rays emitted from the cathode ray cavity from radiating out. But according to Professor Zhu Changshou, radiation and radiation distance square inversely proportional, with the distance lengthening radiation will be rapidly attenuated, so more than one meter viewing distance, the TV on the human electromagnetic radiation pollution is not large. And the TV screen for a variety of radiation absorption capacity is very strong, usually screen 10cm away from the distance radiation has been very small.
In fact, the TV's biggest radiation is from the side and the back of the radiation, but the good thing is that when we watch TV usually do not go to the back of the TV. And when pregnant women are watching TV, it's best to leave the work of switching on and off the TV and wiping the screen to the dads-to-be. Professor Zhu said, LCD TVs and other products do not exist such radiation problems, but it is worth noting that, in fact, the light produced by the TV flicker, brightness changes are most likely to cause people's vision and nervous system fatigue, the heaviest will also cause disease, in every place to prevent radiation, in fact, we should pay most attention to the TV set to bring light pollution.
Mobile phone pollution is not yet conclusive
Mobile phone radiation is certainly there, there is no radiation from the phone how to call out? Xiao Ji's leadership some time ago to bring a radiation clothing, Xiao Zhu did a test, the phone wrapped in the clothes, the phone is always no signal. This to show that the clothes do work, and the second to show that the cell phone is indeed a radiation thing.
Despite the fact that CDMA now says it is lower than GSM radiation, the small smart phone says it is lower than CDMA, GSM radiation are low ...... In fact, even the landline itself has radiation, cell phone between what is comparable?
But at least we know that Bluetooth headsets, wired headsets, and these things do effectively distance us from our cell phones. If cell phones are all much less intrusive if they're pulled away from TVs and speakers, there's no harm in keeping them away from us. There are even some studies that say that cell phones placed in the inside pocket of the upper garment are prone to cause heart disease, and placed in the pants pocket are prone to cause infertility and so on. In fact, there is no unified conclusion, we have to do just sensible and they maintain a certain distance on the line.
In fact, the home of the electrical appliances have radiation is very normal, generally to maintain a certain distance between the use of radiation on people almost no effect. Unless you live under high-voltage power lines or next to a relay station for mobile communications, it will have little effect on your body. Prof. Zhu Changshou told us that radiation is actually the same as fire, and there is no benefit in getting too close to it. No matter what appliances you use, as long as you control the distance, radiation pollution will not come to you.
Computer, network cable can be shielded
Computer, network cable external radiation also exists. Network cable internal current is weak, most of the network cable there is shielding, so when the network cable and computer connected to a good, or network cable using the layout of the dark line method, is pre-buried in the wall, the radiation of the network cable can be basically not considered.
Computer radiation is not very high. Although the CPU, graphics card motherboard these parts of the power of hundreds of watts, and between the board is completely exposed, in fact, they do not produce much radiation. The main radiation from the computer comes from the transformer coil radiation and monitor radiation in the power supply section.
The amount of transformer radiation is small, and is usually more noticeable when the computer is switched on and off. The power supply has very little effect on people because it is deep in the case and the opening is toward the back. Rather, it is the monitor's radiation on people more directly. Radiation of the monitor is still mainly CRT products. However, unlike television sets, when operating a computer how you have to maintain a distance of less than one meter, away from the screen if a lot of small details on the screen will not be able to see. This brings a problem, the visual hazards caused by the monitor may be higher than the TV!
More than a meter away, radiation has little effect, but flicker, brightness changes in the visual stimulation still exists, a long time in this environment, work, entertainment, the impact on the vision and brain to be much higher than the impact of watching TV.
The purest form of light pollution
Today's light bulbs are used less, and lamps are used more. Have you ever tried pointing a digital camera at a glowing light fixture? You can simply test, you will find that the lights in the display flicker, and the effect of the lens on the TV like. This is because most of the lamps we use are AC-powered, and stroboscopic phenomena are more common.
In fact, we use fluorescent lamps, the light itself is stable, according to Professor Zhu, as long as the light is constant, the eyes adapt to, usually not easy to cause visual fatigue. The issue of the visual impact of fluorescent lights is still under debate. But it is certain that working under lights for a long time and working under natural light for a long time definitely have different effects on vision.
Also, not long ago, the reporter also saw a slightly blue energy-saving lamps, this light is very shaky, lighting can be, do not use as a desk lamp bulb.