What harm does radiation do to human body?

As the saying goes, there is no shortage of gold. As a modern high-tech product and electrical equipment, computer brings more convenience, efficiency and joy to people's lives, but there are also some unfavorable factors that are harmful to human health. Judging from the types of radiation, the hidden dangers of computers to human health mainly include electromagnetic radiation (various electromagnetic rays, electromagnetic waves, etc.). ), sound (noise), light (ultraviolet, infrared radiation and visible light, etc. ) and other radiation "pollution". From the perspective of radiation sources, it includes CRT display radiation sources, chassis radiation sources and peripheral equipment radiation sources such as speakers, printers and photocopiers. Among them, the imaging principle of CRT (cathode ray tube) display determines that it is difficult to completely eliminate harmful radiation during its use. Because when it is working, its internal high-frequency electron gun, deflection coil, high-voltage bag and peripheral circuits will produce a variety of rays and electromagnetic waves, such as ionizing radiation (low-energy X-rays), non-ionizing radiation (low-frequency and high-frequency radiation), electrostatic field and optical radiation (including ultraviolet radiation, infrared radiation and visible light, etc.). ). The liquid crystal display uses the physical characteristics of liquid crystal, and its working principle is completely different from that of CRT display. It is a "healthy" display with no radiation (negligible) and environmental protection. Various components inside the chassis, including high-frequency and high-power CPU, various boards with a large number of transistors integrated in the main chip, CD-ROM drive, floppy drive, hard disk, several cooling fans inside the power supply, transformers, etc. When working, it will emit radiation and noise interference such as low-frequency electromagnetic waves. In addition, external speakers, photocopiers and other peripheral equipment radiation sources are also a "source" that cannot be ignored. Some experts' test results show that the computer case and LCD screen are specially shielded from radiation, and the front radiation is not very high. The equipment with high radiation is just the unshielded capacitive element equipment such as keyboard and mouse. Turn off and cut off the power supply of the computer, the components in the computer will not work, and of course, there will be no radiation. Judging from the degree of harm, electromagnetic radiation is undoubtedly the most harmful. Research by medical experts at home and abroad shows that long-term and excessive electromagnetic radiation will directly harm human reproductive system, nervous system and immune system, and it is the main inducement of cardiovascular disease, diabetes and cancer mutation, the inducement of abortion, infertility and teratogenesis of pregnant women, and it can directly affect the development of body tissues and bones of minors, leading to the decline of vision, memory and liver hematopoietic function, and even lead to retinal detachment in severe cases. In addition, electromagnetic radiation also brings hidden dangers to information security, which can be received and decoded by special signal receiving equipment, leading to information leakage and unnecessary losses. Excessive electromagnetic radiation will also interfere with other electronic devices around, affecting their normal work, resulting in electromagnetic compatibility (EMC) problems. Therefore, electromagnetic radiation has been listed by the World Health Organization as the fourth largest environmental pollution source after water, atmosphere and noise, and has become an invisible "killer" that harms human health. Therefore, electromagnetic radiation protection is imperative. Computer radiation electromagnetic radiation usually produces biological effects on the body through thermal effect, non-thermal effect and stimulation. The thermal effect is well known. The human body is a dielectric, which is polarized repeatedly under the action of high electric field, and the collision and friction between molecules produce violent motion, which converts electric energy into heat energy. There is also a dielectric solution (such as body fluid) in the body, which generates a conductive current under the action of an electric field, forming a closed loop of different degrees, generating local induced heat flow, leading to fever. The thermal effect of high frequency radiation, especially microwave radiation, is more obvious. Microwave oven, microwave therapeutic apparatus, etc. Are based on the thermal effect principle of radiant energy. Excessive heating and long-term exposure to radiation will do harm to human body, and the thermal effect of low-frequency electromagnetic radiation is not obvious. Non-thermal effects affect brain cells, weaken the activity ability of cerebral cortex cells and inhibit the conditioned reflex that has been formed. Long-term exposure may lead to nervous system dysfunction. Experiments show that electromagnetic fields can shorten the average sleep time of normal people by 20 minutes. A study by Booth, a professor of cardiovascular medicine in Frejborg, USA, shows that mobile phone radiation increases the diastolic blood pressure of subjects by 10-20mmhg. Stanford University and North Carolina Comprehensive Experimental Systems Company studied the effects of radiation on four kinds of mobile phones and many kinds of animal cells. The results show that radiation can damage the chromosomes of animals. The influence of DNA genetic factors will lead to cell canceration. The cerebral cortex of chickens and cats will be irradiated by ultra-high frequency and ultra-high frequency electromagnetic waves modulated by low frequency, and calcium ions will be precipitated. Calcium ion is an indispensable substance for information transmission, immune system work and cell reproduction in organisms. The experiment also found that low-frequency electromagnetic waves can change the secretion of melatonin in animal pineal gland, and melatonin can inhibit tumor cells. When melatonin is reduced, it can change tissue molecules and lead to degenerative diseases. The Internet age makes people fully realize the magic brought by digital technology, but it also brings some health concerns. At present, the impact of computers and networks on health has aroused great concern. The keyboard is a "dump". In the course of daily work, many people may not realize that frequent use of keyboards may lead to diseases. First of all, the keyboard is a "garbage dump" with dust, hair, hair, eyelashes and so on. According to statistics, this kind of dirt accumulates at an average rate of 2 grams per month. In addition, the keyboard surface is covered with a large number of bacteria, such as Streptococcus, Staphylococcus aureus, Aspergillus fumigatus and so on. The harm of computer radiation to the body can not be ignored. Low-frequency radiation and magnetic fields emitted by computer screens can cause 7- 19 diseases, including itchy eyes, neck and back pain, short-term memory loss, irritability and depression. Computer radiation is also easy to cause abnormal reproductive function and embryonic development in women. According to the investigation of more than 200 computer operators in Wuhan banking system, more than 35% of women have symptoms such as dysmenorrhea and prolonged menstrual period, and a few women have premature delivery or abortion. According to the research of the World Health Organization, if pregnant women use computers for more than 20 hours a week, the incidence of abortion will increase by more than 80%, which may also lead to fetal malformation. Among them, when the eyes are itchy, dry and sour, the eyes are only in the stage of functional injury. However, if we don't pay attention to protect our eyes at this time and make them dry for a long time, it will lead to corneal epithelial cells falling off, causing organic damage, further aggravating symptoms and seriously affecting our vision. Cervical dorsal syndrome caused by long-term tension or injury of neck muscle and soft tissue will develop into cervical spondylosis if it is not treated in time. Women who have been engaged in computer-related work for a long time have a higher risk of breast cancer than non-computer workers. This is a survey in Taiwan Province Province. At present, there are more than 3 million computers in Taiwan Province Province, and most of them are women. If you work in front of the computer for a long time, it will increase the risk of breast cancer; Premenopausal women are more likely to develop breast cancer than postmenopausal women. After the reproductive health of professional women is damaged, the main manifestations are menstrual disorder, pregnancy-induced hypertension syndrome, early menopause, decreased fertility, spontaneous abortion, low birth weight, congenital malformation and even fetal death. The strongest part of computer radiation is the back, followed by the left and right sides, and the front of the screen is the weakest. So try not to let the back of the screen face someone, and the distance should be at least 50 cm to 75 cm, which can reduce the harm of electromagnetic radiation. How to minimize the harm of computer radiation to human body, pay attention to the details of life and maintain health bit by bit. 1. Avoid operating the computer continuously for a long time and pay attention to rest. To maintain a most suitable posture, the distance between the eyes and the screen should be 40~50 cm, so that the eyes can look down or slightly down at the screen. 2. Maintain a good indoor working environment, such as comfortable temperature, clean air, proper negative ion concentration and ozone concentration. 3. The light in the computer room should be suitable, neither too bright nor too dark, so as to avoid the interference of light caused by direct irradiation on the fluorescent screen. The studio should be kept ventilated and dry. 4. Color filters should be used on the computer screen to reduce visual fatigue. It is best to use glass or high-quality plastic filters. 5. Install protective devices to reduce the intensity of electromagnetic radiation. 6. Pay attention to keep your skin clean. There is a lot of static electricity on the surface of computer screen, and the accumulated dust can be transferred to the exposed parts of face and hand skin for a long time, which is prone to macula and pigmentation, and even cause skin lesions in severe cases. 7. Pay attention to supplementary nutrition. Computer operators working in front of the screen for too long will consume rhodopsin on the retina, which is mainly synthesized by vitamin A. Therefore, computer operators should eat more foods such as carrots, Chinese cabbage, bean sprouts, tofu, red dates, oranges, milk, eggs, animal livers and lean meat to supplement vitamin A and protein in the human body. Drink more tea, tea polyphenols and other active substances in tea can help absorb and resist radioactive substances. Computer radiation is inevitable, but it can be reduced. Here are some ways to prevent computer radiation: 1. You should try to buy a new computer, and generally don't use an old one. The radiation of old computers is generally severe, which is generally 1-2 times that of new computers at the same distance and similar models. 2. Pay attention to indoor ventilation. Scientific research has confirmed that computer screens will produce a carcinogen called dibenzofuran bromide. Therefore, it is best to install a ventilator in the room where the computer is placed. If not, pay special attention to ventilation when surfing the internet. The location of the computer is very important. Try not to let the back of the screen face people, because the back of the computer has the strongest radiation, followed by the left and right sides, and the front of the screen has the weakest radiation. 4. Don't put metal objects indoors to avoid electromagnetic waves from being emitted again. When operating a computer, it is best to install a computer-specific color filter on the display screen to reduce the harm of radiation. 6. Adjust the brightness of the screen when using the computer. Generally speaking, the brighter the screen, the stronger the electromagnetic radiation, and vice versa. But it can't be too dark, so as not to affect the effect because of low brightness, which is easy to cause eye fatigue. 7. When using the computer, keep a proper distance from the screen. The closer you are to the screen, the greater the electromagnetic radiation the human body receives, so it is best to stay half a meter away from the screen. 8. After using the computer, many particles of electromagnetic radiation will be adsorbed on the face. Therefore, washing your face with clean water in time will reduce radiation exposure by more than 70%.