Is the hair dryer a high-radiation killer?
Core Tip: Is the home hair dryer a high-radiation killer? "The cumulative amount of radiation used by the household hair dryer three times in a row is equal to the amount of radiation of the X-rays in the hospital", and the description of the mobile phone that is often used near the head, and the blower is more powerful. Lack of knowledge. The electric hair dryer radiates a low-frequency electromagnetic field, and the X-ray radiation and the radio frequency electromagnetic field of the mobile phone are different in the mode of action and the safety strength.
Rumors: Household hair dryers turned out to be a high-radiation killer. The cumulative amount of radiation used for three consecutive home hair dryers is equal to the amount of radiation from the hospital in one X-ray. Moreover, the hair dryer is mainly for blowing hair. It has been applied to the head for a long time, and it has just been verified on the Internet. Compared with the mobile phone that often works near the head, the hair dryer is indeed more harmful.
Truth: For the radiation problems of various household appliances, the first thing to say is a few basic knowledge: as long as the voltage is connected to the two ends of the appliance, there will be an electric field; as long as there is current flowing in the appliance, the current will be around. There is a magnetic field; the voltage and current in the appliance often change, the changing electric field produces a magnetic field, and the changing magnetic field also produces an electric field. Therefore, regardless of the size of the household appliances, whether it is a computer, a television, a microwave oven, or a "home appliance" such as a flashlight, as long as it is related to electricity, the electromagnetic field is radiated more or less outward when used.
As a member of the hair dryer, nature is no exception. Every time you wash your hair, enjoy the gentle warm wind, you may not think about it, this small electric appliance consumes a lot of electricity per second, the power can reach 1000 watts, even higher than the electricity The working power of a monster like a refrigerator. As a high-powered electric appliance, compared to a mobile phone that operates at a milliwatt level with a small battery, or an electromagnetic field that radiates when the hair dryer is working, compared to a microwave oven that shields radiation when the door is closed at work. It is not surprising that these "radiation key suspects" are beyond these.
However, the intensity of the electromagnetic field radiated by the hair dryer is greater, and it does not mean that it is harmful to human health. This radiation and the radiation are different and vary greatly.
The difference with the X-ray film is first compared with the X-ray. X-ray is an ionizing radiation, and the electromagnetic field radiated by household appliances is non-ionizing radiation. X-ray radiation is similar to nuclear radiation, which can cause molecular bond breaks in cells in the human body, and it is carcinogenic. It must not be underestimated. It is very important to control the dose during use. Non-ionizing radiation does not have this ability. The unit that measures the intensity of X-ray radiation is Roentgen, which indicates the number of charges received by the mass of the body unit, and the intensity of the radiation measured by the household appliance is usually the strength of the electromagnetic field. It can be seen that there is no way to compare the amount of radiation between the hair dryer and the amount of radiation from the X-ray film. It is said that "the cumulative amount of radiation used by the household hair dryer three times in a row is equal to the amount of radiation of the X-ray in the hospital" is estimated to be the conclusion of brain filling. To take a step back, even if you want to compare the effects on the human body, it is impossible to compare because of the different effects.
Different from the radiation of mobile phones, computers and microwave ovens, although the radiation emitted by electrical appliances belongs to non-ionizing radiation, most of them belong to the radio wave band in electromagnetic waves, but the electromagnetic fields radiated by different electrical appliances have different frequencies, Differences. For the hair dryer, 50 Hz AC is used. Correspondingly, the frequency of the electromagnetic wave generated around the hair dryer is also about 50 Hz. The frequency of electromagnetic waves emitted by mobile phones for communication is in the range of 0.8 GHz to 2 GHz (the communication system will be different, and 1 GHz is 109 Hz). The microwave in the microwave oven is also roughly this frequency, and the operating frequency of the circuit in the computer CPU is several GHz, and the frequency of the electromagnetic field radiated is also in this range. Looking at the number of sizes, the radiation frequency of the hair dryer is much lower than that of these buddies.
The difference in frequency makes the mechanism of their effects on the human body different. The electromagnetic field of radio frequency (that is, the mobile phone, microwave oven, and computer case) is absorbed by the human body and converted into the energy of rapid movement of molecules in the body. The friction between the rapidly moving molecules increases and the temperature rises. The heat effect heats the food. This kind of thermal effect is much smaller than the ionization effect of the X-ray just mentioned. It requires a large electromagnetic field energy (such as the electromagnetic field strength inside the microwave oven) to pose a real threat to the human body. But for this kind of thermal effect, the scientific community does not dare to ignore it. When using a microwave to heat food, sometimes the inside of the food is already hot, but the surface is still cool. If the electromagnetic field affects the internal organization of the human body in such a way, it is also terrible. Therefore, the corresponding electromagnetic intensity is established for the electromagnetic field in this frequency band. Generally, the radiation intensity around mobile phones, computers, and microwave ovens is far below the criticality of safety standards. worth it.
Low-frequency electromagnetic fields (that is, hair dryers, etc.) do not have the heating effect of radio frequency electromagnetic fields. The main threat to human health is that low-frequency electric fields and low-frequency magnetic fields generate or induce currents in the human body. If the current is large enough, it can cause nerves and muscles to stimulate. But to produce this kind of stimulation, the energy of the electromagnetic field itself must be large enough. Incorporating various factors, the International Commission on Non-Ionizing Radiation Protection (ICNIRP) has established maximum safety values ​​for radio waves of different frequencies including radio frequency electromagnetic fields and low frequency electromagnetic fields: [1]
Is the hair dryer a high-radiation killer?
Among them, the frequency bands of the hair dryer radiation and the frequency bands radiated by mobile phones, computers and microwave ovens are as follows:
It can be seen that the electromagnetic fields at different frequencies have great differences in the strength required to cause harm to humans. The frequency of the hair dryer is very different from the frequency of the microwave oven of the mobile phone. It is too simple and rude to directly take the radiation value of the hair dryer and the mobile phone. Due to the lack of relevant knowledge, there will be such words in the report: "According to a data from the Shanghai Environmental Radiation Research and Monitoring Center, an ordinary household 1000W hair dryer has a radiation value of 350 milligauss (equal to 35μT)."[2 ] In fact, 35μT is still far below the safe maximum magnetic induction, so there is no need to panic.
Conclusion: The rumor is cracked. The working power of the hair dryer is relatively large, and it can radiate a relatively strong electromagnetic field. However, the radiation of the hair dryer belongs to the low-frequency electromagnetic field, and the intensity of the damage to the human body is much greater than the radiation intensity of the hair dryer. The hair dryer is said to be a high-radiation killer, and more alarmist.
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