What are the dangers of electronic products to the human body?

Hazards and protection of electromagnetic radiation to the human body

In modern science and technology, the development and application of electromagnetic technology has reached its heyday. While electromagnetic technology brings us huge benefits, electromagnetic radiation also fills our space, destroys the good electromagnetic ecological environment, and constitutes a new "invisible killer" in modern society. Computers, televisions, mobile phones, induction cookers, printers and other electrical appliances are everywhere, and the harm of electromagnetic radiation to people's daily life is also everywhere. Therefore, it is urgent to study and explore electromagnetic pollution, and it is hoped that through research and discussion, we can find better ways to prevent radiation and help people.

First, the convenience of electronic products

Mobile phones have become an important communication tool for people to communicate, and television has become the main necessity for people to understand national events, culture and entertainment. Computers have become the main office supplies of government agencies and institutions because they are convenient, fast, and able to know the world's affairs, and realize paperless office, and have also become things that children look forward to in their spare time.

It makes communication between people simpler and more convenient, it allows us to get in touch with family anytime and anywhere to avoid getting lost, it replaces PDA, MP3, MP4 and a series of things, making our life more convenient.

At the same time, electronic products can broaden our horizons, increase our knowledge, and make our lives more colorful. We can watch the news on electronic products, keep abreast of national events, understand the international situation, and understand the ever-changing development and changes of the motherland; we can browse programs on electronic products to learn about the achievements of many celebrities and their successful paths, be inspired, and establish lofty ideals; we can help us learn through electronic products, let us understand the author's writing background, learn the English phonetic transcription that we don't know, and search for materials to help us better and faster grasp the content of today's learning.

In short, as long as we grasp the time to turn on and off electronic products, turn off the computer during class, turn on the computer at noon or after school in the afternoon to get in touch with our parents, as long as we use it in the right and appropriate place, as long as we choose the accurate communication content and object, electronic products are beneficial to us and harmless.

2. The harm of electromagnetic radiation to the human body

According to the analysis of experts from the State Environmental Protection Administration, the electromagnetic radiation environment on the mainland is relatively good at present, which is equivalent to the water and air pollution that the mainland faced in the 50s and 60s. However, from now on, it is necessary to strictly manage and take precautions. Because socio-economic development is inseparable from the application of electromagnetic radiation. If electromagnetic pollution reaches the point where the environment cannot tolerate it, it will be difficult to further develop the economy.

Electromagnetic radiation is a composite electromagnetic wave that transmits energy with a change in the electric and magnetic fields perpendicular to each other over time. Human life activities include a series of bioelectric activities, which are very sensitive to the electromagnetic waves of the environment, so electromagnetic radiation can affect and damage the human body.

Electronic products have entered all walks of life and thousands of households in modern society, and it has brought great convenience to people's work, study and life. However, the problems caused by the use of electronic products are also increasing day by day, and "computer diseases" are particularly serious, which has seriously affected people's physical and mental health. The main manifestations are neurasthenic syndrome (dizziness, headache, fatigue, insomnia or nightmares, memory loss, depressed mood, etc.), shoulder, neck and wrist syndrome (bone discomfort, numbness in the fingers, tenderness, etc.), as well as low back pain, reduced disease resistance, etc., and the highest incidence is those professionals who type on the keyboard next to the computer every day. These professionals are mentally stressed, and the brain is in a state of high concentration and tension, which is the root cause of neurasthenic syndrome. The appearance of facial brown spots, erythema resemblance or eczema is also closely related to mental factors. Professionals continuously staring at the computer screen and staring at the flickering fluorescent screen at close range for a long time are easy to make the eyes bloodshot, dry, and photophobic, and in severe cases, the photosensitive function of the retina of the eye will be disordered, the lens will be damaged, and the dark adaptability will be reduced, resulting in vision loss. Pregnant women, children and the elderly are susceptible to electromagnetic radiation, while the heart, eyes and reproductive system are organs sensitive to electromagnetic radiation. In recent years, the birth rate of malformed babies and the increase in leukemia among children have caused electromagnetic radiation.

1. Vision impairment

Electronics can cause damage to our eyes when used for a long time. The harmful blue light emitted by the screens of electronic devices can cause irritation to our retina, which can cause problems such as eye strain, dry eyes, and even myopia. In addition, when using electronic products, the visual distance is close, and it is not easy to form farsightedness. Staring at the screen of a mobile phone for a long time to play games or browse the web can not only aggravate eye fatigue, but also adversely affect sleep quality and even increase the risk of insomnia.

2. Shoulder and neck pain

Prolonged use of electronic products, such as operating computers, playing games, watching videos, etc., will continue to cause people to maintain the same posture, which will not only cause pressure and tension on the neck, shoulders and other joints, but also cause blood circulation, soreness, stiffness, muscle tension and other uncomfortable symptoms. In the long run, it will not only affect physical health, but also emotional and psychological state.

3. Respiratory problems

Electronic products are accompanied by people's lives, most people open computers, mobile phones are also carried on the body, long-term close to electronic products, it is easy to inhale the electromagnetic radiation released by it, these radiation will affect the normal function of various systems of the human body. Especially in the respiratory system, electronic products may induce many diseases such as asthma and allergic rhinitis. Exposure to electronic products such as computers and mobile phones is different from that of engines, and exposure to electronic devices for a long time is also at risk of cancer and other health problems.

4. Neurological problems

In addition to radiation, electronic products also have subtle invisible hazards that cannot be ignored. For example, the electromagnetic waves generated by mobile phones when they make and receive calls or send text messages, although the behavior is small, will have adverse effects on the human nervous system after a long time. This effect can also be associated with vertigo and headaches, and even neurological disorders such as epilepsy, aphasia, and mental disorders.

5. Psychological stress problems

People who are addicted to electronic devices can experience strong mood swings, especially for some young people. On the one hand, we are entangled with electronic products, and on the other hand, we are faced with academic pressure, social pressure and other troubles, which lead to excessive psychological burden, and it is easy to suffer from anxiety, insomnia, depression and other diseases, and even lead to psychological problems such as autism. Electronic products have brought convenience to our lives, but we must pay more attention to self-protection, and pay attention to the reasonable use of electronic products, and try to avoid harm to our health.

Although the essence of electromagnetic waves in each band is the same, the effects of electromagnetic waves of different wavelengths and matter are not the same. When they irradiate biological organisms, they can cause different degrees of biophysical and biochemical changes in biological tissues. The mechanism of electromagnetic radiation harming the human body is mainly the thermogenic effect and the non-thermogenic effect.

　1. Thermogenic effect

　More than 70% of the human body is water, and water molecules rub against each other after being exposed to electromagnetic radiation, causing the body to heat up, thus affecting the normal work of organs in the body.

　The thermogenic effect refers to the absorption of radiant energy by the human body under high-intensity electromagnetic waves, which is converted into heat in the body to produce biological reactions. Under the action of the electromagnetic field, due to the rapid change in the direction of the radio frequency electromagnetic field, the polar molecules in the human body quickly undergo the orientation of the dipole and generate heat. During the orientation process, the dipole collides with the surrounding molecules and generates a large amount of heat. In addition, when the frequency of the electromagnetic field is high, the electrolyte in the body and the ions in the solution will vibrate in their equilibrium position, which also converts electrical energy into heat energy.

　In short, the heating effect mainly includes (1) frictional heat generation due to repeated rapid orientation rotation of polar molecules in the high-frequency electromagnetic field, (2) conduction current heat generation, and (3) dielectric loss heat generation.

　2. Non-thermogenic effect

　The organs and tissues of the human body have weak electromagnetic fields, they are stable and orderly, once disturbed by the external electromagnetic field, the weak electromagnetic field in equilibrium is about to be destroyed, and the human body will also suffer damage. Non-thermogenic effects are neurasthenia and disorders of the cardiovascular system at low intensity without causing changes in body temperature. For alternating electromagnetic fields, their biological activity increases with decreasing wavelengths. After being absorbed by the body, X-rays and γ rays, which are ionizing radiation, will start from the excitation or ionization at the atomic level, and then cause destruction at the molecular level, such as the destruction of protein molecules, DNA bond breaks, and enzymes, and further affect the damage at the cellular level, tissue organs, and even the overall level. „

　3. The harm of microwaves to living organisms

　Microwave is a high-frequency electromagnetic wave, and the electromagnetic wave with a frequency of about 300MHz~300GHz is called microwave, and the corresponding wavelength range is 1 meter to one millimeter. A certain dose of microwave acting on an organism can produce a thermogenic effect, which can affect different parts of the organism.

　The effect of microwaves on the nervous system is related to factors such as the mode of irradiation and the dose of irradiation. Short-term, low-dose irradiation can enhance the excitatory process of the cerebral cortex, and long-term, high-dose irradiation can enhance the inhibitory process, especially the head effect. The action of high-dose microwaves can affect the mediation function of the autonomic nervous system, causing changes in blood circulation, respiratory rate, and changes in the skin and rectum.

　Large doses of microwave radiation can cause extreme congestion in the lungs, violently dilated blood vessels, alveolar epithelium shedding and blood gushing into the alveolar cavity through capillaries, resulting in pulmonary hemorrhage, edema, and can be fatal. However, small doses of microwaves have a therapeutic effect on lung inflammation.

　Women who are regularly exposed to microwaves may have irregular menstruation and insufficient lactation during lactation. In men, sperm production is significantly reduced or stopped when microwave radiation raises the temperature of the testicles by more than 35°C.

　For the human eye, when the power density of microwaves is greater than 10 mW.cm-2 and less than 300 mW.cm-2, it can cause recoverable damage to the eye lens. When the power density is greater than 300mW.cm-2, irreparable damage occurs.

　Repeated exposure of large doses of microwaves to the skin will cause coagulative necrosis, and muscle fibers and horizontal lines will be blurred. There were no obvious histological changes in the skin and muscles under the radiation of small doses of microwaves.

3. Protection against electromagnetic radiation in daily life

With the development of civilization and the entry of human beings into the information society, electromagnetic radiation accompanies us all the time. The sources of electromagnetic radiation pollution caused by electronic products are everywhere, and we cannot give up the use of these high-tech products because of the existence of electromagnetic radiation, which will regress the quality of life. Therefore, in the face of all kinds of electronic products that are closely related to us in life, it is important to do some basic understanding and protective measures to effectively prevent electromagnetic radiation and reduce the harm to the body.

1. Electromagnetic shielding mechanism

Electromagnetic shielding is a method of using a shield to prevent the propagation of electromagnetic fields in space, that is, to limit the transfer of electromagnetic energy from one side of the shielding material to the other side. The principle of action is to use a conductor material with low resistance, because the conductor material has a reflection and guidance effect on the electromagnetic energy flow, the current and magnetic polarization opposite to the source electromagnetic field are generated inside the conductor material, so as to weaken the radiation effect of the source electromagnetic field.

　When electromagnetic waves propagate to the electromagnetic shielding surface of metal materials, there are usually three different mechanisms for attenuation: one is the reflection attenuation on the incident surface, the second is the attenuation of the electromagnetic wave that is not reflected and enters the shield body is absorbed by the material, and the third is the attenuation of multiple reflections inside the shield.

　Reflection attenuation is the induced current generated by electromagnetic induction when an electromagnetic field is injected into a metal conductor. Under the action of this induced current, a new electromagnetic field must be established, so that the incident field energy will be attenuated. The magnitude of the reflection attenuation depends on the impedance match between the shield and the media surrounding the shield.

　Absorption attenuation, which is essentially the heat loss of a conductor. It is completely due to the electromagnetic field injected into the metal shield, due to electromagnetic induction and the metal surface of the induced current, and because of the metal conductor, especially the conductor surface, there is a certain resistance, inevitably in the metal shield, heat loss.

　2. Shielding material

　(1) Surface conductive materials　　

　Surface conductive shielding materials, including conductive coatings, metal melting, metal foils, and electroplated plastics. In particular, conductive coatings occupy the main market of electromagnetic shielding materials due to their low cost and medium shielding effect, simple and practical and wide application.

　(2) Fill with composite shielding material

　It is composed of synthetic resin with good electrical insulation and other additives with excellent conductivity, and is made of various electromagnetic shielding materials by injection molding or extrusion molding. Among them, commonly used synthetic resins are polyphenylene ether, polycarbonate, ABS, nylon and thermoplastic polyester. Conductive fillers are generally made of large-sized fibrous and flake materials. At present, the most commonly used are metal fibers, metal sheets, etc., in addition to carbon fibers, superconducting carbon black, metal alloy fillers, etc.

　(3) Electromagnetic shielding fabrics

　At home and abroad, electromagnetic shielding fabrics made by coating method, electroplating method and composite spinning method have been developed, and the blended spinning method is in the development stage.

　3. Protective measures for workers in the electromagnetic radiation zone

　Areas where RF power density is estimated or detected to exceed 50 μW/cm2 should be considered as potentially hazardous areas for electromagnetic radiation.

　(1) Warning signs should be provided in dangerous areas where personnel are likely to enter. Unless there is an emergency, no personnel are allowed to enter areas where the field strength meter exceeds 50 μW/cm2 after calculation or measurement with a field strength meter.

　(2) The high-power signal generator should be prevented from discharging during the test, as it will generate electromagnetic radiation greater than 50μW/cm2 in the area around it. In doing so, a dummy load or other absorbent material is used to absorb its output energy.

　(3) Protective equipment should be used to minimize radiation hazards. It is important to ensure that maintenance personnel working in the beam area of the transmitting antenna wear protective clothing.

　(4) Persons with metal implants, pacemakers, and other assistive devices should not be allowed to enter the electromagnetic radiation zone.

　(5) Persons exposed to radiation sources, electromagnetic energy and high-voltage devices shall be subject to regular physical examinations.

Radiation types and radiation characteristics of household appliances:

Microwave oven: the maximum radiation is at the crack of the door, and the maximum radiation is at start, so don't get too close when cooking, the radiation range can be up to 7 meters.

Electric blanket: When the electric blanket is energized, it will produce an electromagnetic field, which will produce electromagnetic radiation. If pregnant women use electric blankets, they are most likely to be adversely affected by these electromagnetic radiation for a long time, which will most likely adversely affect the important organs and tissues of the fetus, such as the brain, nerves, bones and heart.

Humidifier: should not be too close to the human body, try to keep an appropriate distance when using.

LCD TVs and monitors: The selling point of LCD products is that the radiation is small, so they can be used with confidence.

Laptops: The radiation is concentrated above the keyboard and should be kept at a distance from the power adapter when in use.

Mobile phone: Try to use the landline to make calls, and use mobile phones less to make calls. The electromagnetic radiation released at the moment of mobile phone connection is the most powerful, the distance between the head and the mobile phone antenna is as far as possible when using, and it is best to use separate headphones and microphones to answer calls.

Computer: (1) When using the computer, try to minimize the contact time and keep an appropriate distance from the screen, when using a non-liquid crystal display screen, it is best to install an anti-radiation isolation screen; (2) Put a pot of cactus next to the computer desk, the cactus can absorb the electromagnetic radiation released by the computer; (3) If the body is 71 cm away from the screen, the electromagnetic radiation will be greatly reduced; (4) Do not place a workbench behind or on both sides of the computer, because the electromagnetic radiation emitted by the back or both sides of the computer is much greater than the screen in front。

There are many types of household appliances, and the intensity of radiation is not the same, so we must continue to explore and improve the use of them in a timely manner to reduce the harm of electromagnetic radiation to the human body as much as possible.

1. Radiation protection at home. According to the analysis of radiation detection experts, some of the natural decorative stones used in residents' homes are radioactively contaminated. Some wallpapers, wall cloths, coatings, plastics, plates, etc. used in home decoration release a large number of harmful gases, resulting in serious air pollution in the living room, and becoming a "radiant house" and "polluted house". Therefore, whether you are buying a house or renting a house, you should first do a thorough radiation test, try to avoid living in an unhealthy environment, if you can no longer change your residence, you should measure where the radiation is strongest, shield it or adjust the position of furniture, so that the distance between family members and radiation materials is increased, and the time for receiving radiation is reduced.

2. Don't put household appliances too centrally, or use them together. so as not to expose yourself to the dangers of excessive doses of radiation. It is impossible for the human body to be shielded, and if all kinds of electrical appliances are used at the same time, it is like being surrounded by electromagnetic waves, which causes harm to the human body.

3. Improve the awareness of self-protection. Pay attention to the harm that electromagnetic radiation may cause to the human body, learn more about the common sense of electromagnetic radiation, learn preventive measures, and strengthen safety precautions. According to the application manuals and instructions of various electronic products, maintain a safe operating distance. When purchasing electronic products, attention should be paid to confirming whether the product has been certified by 3C (the national safety certification for electronic electromagnetic compatibility), and the use of high-radiation products should be minimized.

4. When the appliance is not in use, it is better to turn off the power instead of leaving it in standby. In this way, not only can electricity be saved, but also the accumulation of trace amounts of electromagnetic radiation can be reduced.

5. Wash your hands and face in time after watching TV and computer for a long time to keep indoor air circulation.

6. All kinds of household appliances, office equipment, and mobile phones should be avoided for a long time. If you really need to use the TV or computer for a long time, you should pay attention to leave it at least once an hour, and use the way of looking into the distance or closing your eyes to reduce the fatigue of your eyes and the impact of radiation.

7. Eat more foods rich in vitamins A, C and protein. Such as carrots, cabbage, tofu, milk, eggs and other foods to help regulate the human body's electromagnetic field disorder.

8. Drink plenty of water. The tea polyphenols in tea are good for radiation protection.

IV. Conclusion

In today's widespread existence of electromagnetic radiation, it can be said that electromagnetic waves are inseparable from our lives, obviously we make full use of electromagnetic waves to bring us convenience while paying attention to reducing the harm of electromagnetic radiation to us is the work we need to do. Electromagnetic radiation leakage is a systematic project, and no single protective measure is foolproof. According to the characteristics of different electrical products, the best protective measures suitable for them should be adopted for comprehensive protection.