[Induction cooker radiation]Is induction cooker radiation harmful?
“Induction cooker radiation” can also be called “induction cooker leakage radiation”. There is a certain amount of radiation in the induction cooker, because the magnetic field generated by the general induction cooker cannot be 100% absorbed by the pot, and part of the magnetic field leaks from the surrounding of the pot, forming electromagnetic radiation. Although the radiation frequency of the induction cooker is about one-sixtieth of the frequency of the mobile phone signal, the power that really determines the size of the radiation is much larger than that of the mobile phone signal. This radiation power mainly depends on the leakage value of the electromagnetic wave of the induction cooker. The greater the leakage The greater the damage to the user.
The source of the radiation of the induction cooker
All household appliances have radiation, but the 3C compulsory certification currently implemented by the country mainly It focuses on product performance and safe use, such as whether there is leakage, but there is no mandatory electromagnetic compatibility project.
The working principle of the induction cooker is to convert the 50HZ low-frequency AC power into 30KHZ-40KHZ high-frequency AC power, directly add it to the coil plate of the induction cooker to generate a high-power electromagnetic field, and then use the electromagnetic field to make the pot body. Heating is performed by generating eddy currents. Usually, a copper coil is installed under the heat insulating plate of the cooktop of the induction cooker, and the electric energy conversion device generates an alternating magnetic field in the coil. The frequency is generally from 20kHz to 40kHz, which belongs to the category of extremely low frequency electromagnetic fields. When the alternating magnetic field passes through the ferromagnetic metal utensils on the furnace surface, eddy current and hysteresis loss effects are generated, which converts electrical energy into heat energy.
In addition to heating the pot body on the stove surface, the electromagnetic radiation generated by the coil plate of the ordinary induction cooker will be released from the body of the induction cooker and the pot body, which will cause people’s problems. Said leakage of electromagnetic radiation. The intensity of the leaked radiation source is related to the power of the induction cooker and the quality of the induction cooker. The more concentrated the radiation position and direction of the electromagnetic wave, the more ideal it is upwards. If it is to the outer edge, a larger leakage will occur.
Magnetic fields are all around us
The ever-increasing demand for electricity, fast-moving new technologies and changing ways of socializing have created more and more artificial Sources of electromagnetic fields, exposure to man-made electromagnetic fields in the environment is increasing. From the generation and transmission of electricity, household appliances, industrial equipment to telecommunications and broadcasting, whether at home or at work, everyone is exposed to a complex mix of weak electric and weak magnetic fields.
A magnetic field is created when an electric current flows through it: the greater the electric current, the larger the magnetic field. Electromagnetic fields are everywhere in our environment, but our eyes cannot see them. During thunderstorms, the accumulation of localized charges in the air can generate electric fields. The earth’s geomagnetic field can make the compass point to the north-south direction. Birds and fish use the geomagnetic field to determine the direction.
In addition to natural sources, the electromagnetic spectrum also includes electromagnetic fields produced by many man-made sources: X-rays can be used to examine limbs that have been accidentally broken during exercise; Contact; radio waves with higher frequencies can be used to transmit information, whether through TV antennas, radio stations, or cell phone base stations.
Hazards of Electromagnetic Radiation
There is no debate that electromagnetic fields above a certain intensity can cause biological effects. Experiments on healthy volunteers showed that short-term exposure to electromagnetic fields of normal intensity in the environment or in the home did not cause any significant harmful effects. Exposure to higher intensity electromagnetic fields that can cause injury is strictly limited by national and international safety guidelines. Controversy is currently focused on whether long-term low-intensity exposure can cause biological effects and affect humans.
The strength of the radio frequency electromagnetic field to which people are normally exposed is much lower than that which can produce a significant heating effect. The heating effect of radio frequency electromagnetic waves is the main basis for the formulation of current safety guidelines. Scientists are also investigating the possibility of long-term exposure below a threshold that can heat the body. So far, the adverse health effects of low-intensity and prolonged exposure to RF and power-frequency electromagnetic fields have not been proven.
Electromagnetic Radiation and Cancer
In 2002, the International Agency for Research on Cancer classified extremely low frequency electromagnetic radiation as a suspected carcinogen, and it was identified as a suspected carcinogen in epidemiological studies. Based on the combined analysis methods of , demonstrated a consistent pattern: average exposure of children to residential power-frequency magnetic fields exceeding 0.3-0.4 μT triples the probability of developing leukemia. This conclusion was widely quoted by the domestic media, which temporarily caused people to panic about the safety of home appliances.
However, the WHO made a clear explanation for the health effects of electromagnetic radiation in its review conclusions in 2007, believing that the conclusions of the International Agency for Research on Cancer could not indicate that due to improper methods and lack of effective biophysical mechanisms. The causal relationship between electromagnetic radiation and childhood leukemia;
At the same time, the International Association for Non-Electrical Radiation Protection (ICNIRP) supports the WHO review conclusion that there is insufficient evidence to prove the pathogenicity of low-frequency electromagnetic radiation, chronic Exposure to low-intensity low-frequency electromagnetic radiation also does not cause disease. But it also illustrates that low-frequency electromagnetic radiation at high electric field strengths can cause physical discomfort (not pathogenicity) in contacts.
ICNIRP states that low-frequency electromagnetic field exposure has several well-established acute effects on the nervous system: direct stimulation of nerve and muscle tissue and triggering of retinal phosphenes. There is also indirect scientific evidence that brain functions such as visual processes and motor coordination may be transiently affected by induced electric fields. All of these effects have thresholds below which they do not occur and can be avoided as long as the fundamental limits of induced electric fields in the body are met.
Is the induction cooker dangerous?
The frequency of the AC magnetic field generated by the electric energy conversion device of the induction cooker is generally from 20kHz to 40kHz, which belongs to the category of extremely low frequency electromagnetic field. Therefore, the view that “electromagnetic pollution can induce cardiovascular disease and even cancer” does not apply to low-frequency household appliances such as induction cookers.
Currently, there is no scientific evidence that low-frequency electromagnetic fields cause disease in humans. Therefore, the statement that “radiation from the induction cooker may cause cancer” and the conclusions that “pregnant women and children should avoid using the induction cooker as much as possible” and “the induction cooker should not be used for too long” have no factual basis. As long as it is a regular manufacturer, the induction cooker that has passed the electromagnetic strength test does not have to worry about electromagnetic radiation in use.
So we have to eliminate the hidden danger of radiation at the beginning of the purchase. When buying an induction cooker, be sure to choose a regular and well-known brand. Generally speaking, the more regular the induction cooker is, the stricter its production is and the smaller the relative electromagnetic radiation. In addition, when choosing a pot, iron and steel products are the main ones, because this type of ferromagnetic material will match the heating load (pot body and stove) with the induced eddy current during the heating process, and the energy conversion rate is high. Fewer leaks.
In addition, when purchasing an induction cooker, you should ask the seller for an electromagnetic induction strength test report. General induction cookers will have this thing. Use this report to compare and choose an induction cooker with relatively low electromagnetic radiation.
