Survey viewpoint
The radiation hazard is very small
Beware of cumulative effect
The popularity of wireless charging function is getting wider and wider. Compared with the traditional direct charging method, the radiation is more harmful, and the market needs an industry standard to regulate it. Because the radiation value is relatively small, users can easily ignore it. Maybe this is a big misunderstanding.
Radiation standards are still being worked out.
According to the Regulations on Electromagnetic Radiation Protection, the average specific absorption rate (SAR) of the whole body for any continuous 6 minutes should be less than 0.02W/kg within 24 hours of 1 day.
"But this is only a very simple standard, and the specific provisions of the product are still unclear." Ms. Zhao from china communications standards association Standard Information Service Department said. It is understood that the association is formulating the electromagnetic radiation standard for wireless charging, and is also studying the evaluation method of human exposure to this electromagnetic radiation. The specific content has not yet been announced.
Chen Jinqiao, deputy chief engineer of the Institute of Telecommunications, Ministry of Industry and Information Technology, said that the traditional mobile phone charger (direct charging) has standards. As a new technology, the state should formulate it as soon as possible for consumers to understand and refer to. This is the next step.
The harm is within the tolerance range.
The lack of standards makes the popular wireless chargers in the market "empty". Dai Zishan, marketing manager of Lindong Technology Co., Ltd. said that most wireless chargers on the market will not indicate the radiation value. "But our products will be certified by FCC, CE and Rhos.
The staff of the Communication Department of the Ministry of Industry and Information Technology said that it is inevitable that the wireless charger has radiation, but since it has been listed, it means that it must meet international standards and will not cause great harm to the human body. For this view, He Guili, director of the Tel laboratory of the Institute of Telecommunications of the Ministry of Industry and Information Technology, agrees: "As long as the wireless charger is done according to the technical specifications, it will not cause radiation damage to the human body."
But there is still a key problem. Although the radiation value of wireless charger is very small, users are exposed to more and more radiation. Will this have a "cumulative effect"? For example, will the radiation superimposed by wireless charger, mobile phone, WiFi and TV cause harm to human body?
The comprehensive radiation hazard is relatively large.
"There is no such comprehensive standard yet." The staff of the Communication Department of the Ministry of Industry and Information Technology said, but he personally thought that this should not be a problem of 1+ 1=2. "As long as the radiation value of each electrical appliance is within the standard range, it should not cause harm."
An engineer surnamed Guan of Beijing Indoor Environmental Pollution Detection Technology Center believes that if there are many radiation sources like this, it may be more harmful to human body. "If there are sensitive people such as the elderly, children and pregnant women at home, we must minimize radiation."
However, the difficulty is that this kind of radiation is generally difficult to avoid. "Unless you don't use it, it is inevitable for the user itself. It is best not to use it at the same time. " The staff member believes.
Radiation is colorless, odorless, invisible, intangible, and imperceptible: wireless signals are flying in the sky, household appliances are used indoors, mobile phones and tablets are in hand, and a lot of wireless chargers are placed next to them ... and there is no way to reduce radiation at present, so users can only ask for more happiness now.
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Needless to say, it is convenient. In addition, wireless charging is safer. There is no exposed connector, which completely avoids potential safety hazards such as electric leakage and electricity running. Some people are worried about radiation. This technology was first used in the water purifier for eight years, and its safety has been verified by 36 countries, and it will never bring harm to human body and environment. According to reports, wireless charging generally transmits energy through magnetic fields, while humans and most objects around them are non-magnetic. Another advantage of wireless charging is power saving. The efficiency of wireless charging device is about 70%, which is equivalent to that of wired charging device, but it has the function of automatically turning off after being fully charged, thus avoiding unnecessary energy consumption. Moreover, the efficiency acceptance rate is constantly improving, and will soon reach 98%.
Wireless charging equipment is much smarter than ordinary chargers. For different electronic products, the power interface can automatically correspond. When charging is needed, the transmitting and receiving chips will automatically start working at the same time, and both sides will automatically shut down after being fully charged. It can also automatically identify different equipment and energy needs and carry out' personalized work', which is wisdom.
Now, for the safety and convenience of consumers, relevant researchers have provided near-field wireless charging technology (that is, it needs to be placed next to the transmitter), and are also studying long-distance wireless charging, which will be an emerging market. In fact, the current technology can achieve effective power transmission in the range of 3 feet to 4 feet, but this needs to be verified by relevant institutions. I believe that in the next 5 to 10 years, or even faster, long-distance wireless charging will come into everyone's life.
The future is not only low-power appliances, but also common household appliances, medical equipment, power tools, office appliances, kitchen appliances and so on. It can be charged wirelessly. In fact, it should be called "wireless power supply" accurately, that is, using electric energy while transmitting, without any storage equipment similar to batteries, let alone charging in advance.
By then, wires, patch panels and batteries can disappear, and you won't even feel the existence of electricity. Just like air, it makes you feel at your fingertips.
Does the marble table have radiation to human body? Will it cause cancer? Natural marble has high radiation and contains certain radioactive substances. The darker the color, the greater the radiation. Artificial marble can be understood as basically radiation-free. Long-term exposure to high radiation will seriously affect health and even cause cancer.
Natural marble: metamorphic rock formed by high temperature and high pressure in the crust. It belongs to medium hard rock and is mainly composed of calcite, limestone, serpentine and dolomite. Its main component is calcium carbonate, accounting for more than 50%. Because marble generally contains impurities, calcium carbonate is easily weathered and dissolved by carbon dioxide, carbide and water vapor in the atmosphere, and the surface quickly loses its luster. Therefore, a few stable and durable varieties, such as white marble and Ai Yeqing, have pure quality and few impurities, and can be used outdoors, while other varieties are not suitable for outdoor use and are generally only used for indoor decorative surfaces. The main varieties are: cloud gray marble, colored marble and so on.
Artificial marble: it is made of natural marble or granite crushed stone as filler and cement, gypsum and unsaturated polyester resin as binder through stirring, molding, grinding and polishing.
How big is PET-cT radiation to human body? Will it cause cancer? I suggest you try not to do CT! Studies by the International Commission on Radiation Protection (ICRP) have confirmed that whole-body CT scanning will increase the risk of radiation-induced cancer by about 8%. Radiation carcinogenesis and hereditary diseases are dose linear, which means that the more exposure, the greater the possibility of fatal cancer and hereditary diseases. At present, the abuse of CT examination is not uncommon. Patients have a small problem, that is, CT examination, and some people even have to do it several times a month, which not only causes economic waste, but also may cause radiation damage.
Therefore, both medical staff and the public should learn some knowledge about radiation protection. The indications of CT examination should be strictly controlled. Non-radiation methods (such as ultrasound, nuclear magnetic resonance, etc. ) it should be used, and CT examination is not needed if it can be solved by filming. Pay special attention to women of childbearing age, pregnant women and babies, and try to avoid CT examination. Prevent problems before they happen and reduce the harm of radiation to human beings.
There is no way to eliminate the radiation damage of CT, only to do less and not to do it!
Does wireless charging of mobile phone have an impact on human body? Some Samsung mobile phones support wireless charging function, which requires a separate charging kit. The effect of wireless charging is the same as wired charging, except that wireless charging takes a long time and has no effect on human body or mobile phone.
It has little effect on human body;
Wireless charging uses the principle of electromagnetic induction, which has low working frequency and little harm. If you are still worried, you can choose a covered plan. This is the user manual of a typical mobile phone wireless rechargeable battery with shielding scheme:
Universal mobile phone wireless charger
-Instructions for use
This mobile phone wireless charger is the most advanced technology in the world at present, which is rich in many advanced technical indicators such as micro-volume, large current, micro-temperature rise, metal resistance and error-free operation. Only it can integrate a variety of essences, successfully built into the battery, can easily turn various different brands of mobile phones into wireless charging mobile phones instantly, has super anti-interference ability, and any other items such as electromagnets and metals will not cause misoperation on the launch board. It also has a perfect self-checking function of sending and receiving faults, and a super communication function between sending and receiving. The emission board can accurately identify the charging state of the battery, accurately indicate and adjust the emission current in time. The emission board also has the over-current protection function of the battery.
At present, the mobile phone wireless charger on the market, whether at home or abroad, is limited by technology. Their fatal weaknesses are: huge volume, imperfect protection measures, and most of them can only stay in the initial stage of adding a coat and a back shell, which is extremely inconvenient to use, so they cannot be widely used, and it is easy to cause unsafe heat to mobile phone metal objects, batteries and so on. With the successful listing of new products of Coretech, the long-awaited wireless charger can finally be widely used in high-end and low-end mobile phones of different brands, making the popularization of wireless charging easy. The same launch board is all compatible with different brands and models of mobile phones, so that new technology can completely change life!
Launching plate parameters
* Power supply voltage: 12V
* power supply current: the maximum working current is limited to 350mA.
* standby working current is about 20mA.
* Modules (batteries) not provided by our company will not work.
* Any metal object placed on the launch board will not work.
* Any other object placed on it will not fail.
* Super self-check function: When the voltage of the transmitting board is wrong or fails, the traffic lights will light up at the same time and stop working automatically, and the receiving board will stop working due to assembly error or failure.
Receive some parameters:
* The batteries used are all high-quality A-class batteries, and the electronic equipment used is the best.
* The maximum current accepted by the battery is 500mA, which is almost the same as the charging speed of direct charging.
* wireless charging can be realized without adding another set.
* Automatic shutdown after filling.
* If a fully charged battery is placed on the emission board, the red light will flash.
Does the wireless bridge radiate to the human body? Yes, and there is a lot of radiation. At present, the power of most devices such as bridge ap is 500mw, and the 2.4g frequency band is the most harmful to the eyes. Stay away from the bridge
Does wireless routing have radiation on human body? The radiation problem was considered at the beginning of the redesign, and its radiation can be ignored; On the contrary, what you need to worry about is that some daily household appliances, such as microwave ovens (which radiate the most at the door after being turned on), induction cookers, desktop computers (which radiate more at the side and back) and notebook computers (which radiate more at the keyboard), radiate more at work than wireless routers.
If you still don't believe me, I can tell you that even your most commonly used mobile phone radiates more than the wireless router-the signal coverage of the wireless router is about 300m; Mobile phone signals are everywhere (the greater the radiation energy, the wider the coverage), and the radiation of mobile phones is about 200 times that of wireless routers: for a simple example, when the mobile phone is placed next to the display, when an incoming call or information is being sent, there will be a wavy bar shaking on the screen or the speaker will make a squeaking sound, and the router is placed next to the display, no matter how much data is exchanged,
Does wireless radar electromagnetic wave radiate to human body? Radar detects objects by radiating electromagnetic waves. If you are in the direction of the radar antenna radiation beam, you will definitely be radiated, whether you are human or not.
Does electric welding have radiation on human body? Research progress of occupational hazards in welding operations 1, hazards and influencing factors of welding operations There are many health hazards in welding operations, which can be generally divided into two categories: physical factors and chemical factors. The former includes ultraviolet and infrared rays generated by high temperature arc light. The latter is various components of welding aerosol, including solid metals such as iron, manganese, aluminum, chromium, lead, nickel and radioactive elements, and gaseous gases such as manganese oxide, hydrogen fluoride and nitrogen oxides [1]. High temperature, vibration and noise are not obvious. Welding aerosol has high dispersibility and its biological activity is obviously higher than other dusts. The composition of welding aerosol varies greatly with different covered electrode and welding methods, and its biological activity is also different [2]; Biological activity is also related to the solubility and freshness of welding fume. 2. Damage of welding operation to workers' health 2. 1 welder's pneumoconiosis and lung function. During arc welding, the welding core, coating and metal base material in covered electrode are melted, evaporated, oxidized and agglomerated at the high temperature of arc, resulting in a large amount of dust of metal oxides and other substances, which can cause welder's pneumoconiosis if inhaled for a long time. Welder's pneumoconiosis generally occurs in a closed and poorly ventilated working environment, and the average length of service is about 18 years [3]. The measurement of lung ventilation function shows that exposure to welding dust can damage the lung ventilation function of welders to a certain extent, and the indexes of lung ventilation function such as FVC, FEV 1.0, FEV 1.0%, MMF, V50, V25 and PEFR are obviously reduced [4]. Smoking and dust exposure may have a synergistic effect on the pulmonary ventilation function of welders. The damage of lung ventilation function of welders tends to be aggravated with the extension of dust exposure time [5]. 2.2 Manganese Poisoning Various weldments and covered electrode contain different amounts of manganese. Generally, the content of manganese in welding core is very low, only about 0.3~0.6%. When welding in places with poor ventilation, such as cabins, boilers or closed containers, manganese poisoning can occur if smoke containing manganese is inhaled for a long time, and the increase of bleeding manganese and urine manganese and the change of neurobehavioral function can be detected [6]. Determination of hair manganese can also be used as an early screening index for manganese poisoning [7] 2.3 Welding fume fever, also known as welder fever, is a kind of metal fume fever. It is a systemic disease caused by inhalation of metal oxides, which is characterized by a sudden increase in body temperature and an increase in peripheral white blood cell count. It usually begins at 6- 12 hours after exposure to metal oxide smoke [8], and dizziness, fatigue, chest tightness, shortness of breath and muscle and joint pain occur. 2.4 Effects on the nervous system A large number of studies have shown that there is nervous system damage related to occupational exposure in welding operations, which mainly involves information processing functions such as memory, analysis and location, showing abnormal neurophysiology, neuropsychology and neurobehavior [9], which is closely related to manganese, aluminum and lead in welding dust. Use who. NCTB test showed that the total score of behavioral function was negatively correlated with urinary manganese [10], suggesting that the change of neurobehavioral function can be used as one of the early indicators to prevent manganese poisoning [1 1]. Foreign studies have reported that the total score of behavioral function of electric welding workers is higher than that of the control group. The author analyzes that it may be caused by the health effect of workers and the training effect of job-related skills [12]. The influence of electric welding on the investigation function of workers' parasympathetic nerves has also been reported [13]. It has been reported abroad that the onset age of welder's Parkinson's syndrome is obviously earlier [14] (the average age is 46 years old, and the average age of control group is 63 years old), suggesting that welding work is one of the risk factors of Parkinson's syndrome. 2.5 Effects on eyes and panels The damage of ultraviolet rays (UVR) and infrared rays (IFR) to eyes and panels is an important aspect of occupational injuries in welding operations. It is often reported that the eye symptoms of welders are obviously increasing, such as electro-optic ophthalmia, chronic blepharitis, conjunctivitis and lens opacity, and the prevalence of chronic blepharitis and conjunctivitis tends to increase with the increase of working years [15]. The main damage caused by UVR overexposure is photosensitive keratitis, and the welder's cataract is related to infrared exposure. Recent studies abroad show that workers exposed to excessive UVR are at risk of non-melanocytic panel cancer [16] and other chronic diseases such as malignant melanoma of the eye [17]. 2.6 The impact on the reproductive system is significant. Therefore, in recent 10 years, some studies on reproductive toxicity of electric welding have been carried out at home and abroad, mainly involving the quality of male workers, the reproductive outcome of female workers and the injury mechanism. The research shows that the menstrual flow, shortened cycle, prolonged menstrual period, increased leucorrhea, spontaneous abortion, premature delivery and dysmenorrhea of female welders are higher than those of the control group [18]. The appearance of manganese poisoning male workers is even grayish white, the PH value is normal, and the average liquefaction time is longer than that of the control group. The results showed that the average amount, total number, survival rate and activity rate of male workers with manganese poisoning were lower than those of the control group, and the disability rate of male workers with manganese poisoning was significantly higher than that of the control group [19]. It is considered that manganese metal can affect the spermatogenic system of male workers, have a direct toxic effect on the development of * * * *, and can kill * * *, thus causing changes in the quality of male * * * *. It has also been reported abroad that the sex hormone secretion of welders has changed and the quality of * * has decreased, but it has no effect on the sex ratio of future generations [20]. 2.7 Effects on the levels of enzymes and antibodies in vivo In recent years, there have been many reports on the effects of electric welding on enzymes and antibodies in workers. The results showed that the total superoxide dismutase (T-SOD) and glutathione peroxidase (GSH-Px) in welders' serum decreased significantly, and the level of malondialdehyde (MDA) increased significantly, but there was no dose-effect relationship [2 1, 22]. When welders are under oxidative stress, their antioxidant capacity is weakened, indicating that the biofilm is destroyed [23]. In order to explore the influence of welding dust on human immunoglobulin content, the contents of IgG, IgA and IgM in serum of welders and healthy controls were determined by one-way immunoagar diffusion method. The results showed that the contents of IgG and IgA in welding group were significantly different from those in control group (P
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