The terminal of a computer is a monitor, and the principle is the same as that of a TV. When the electron stream emitted by the cathode ray tube hits the fluorescent screen, it can be converted into visible light, which will produce X-rays harmful to human body in the process. Moreover, low-frequency electromagnetic fields will be generated around VDT, which will be polluted by electromagnetic radiation for a long time and easily lead to diseases such as glaucoma, blindness, leukemia and breast cancer. According to incomplete statistics, among people who often use computers, 83% feel eye fatigue, 63.9% suffer from shoulder pain and low back pain, 56. 1% and 54.4% suffer from headache and loss of appetite, and others suffer from autonomic nervous disorder, depression and arteriosclerosis psychosis.

How to minimize the harm of computer radiation to human body, I think we should do the following:

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.

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Uncover the X-files of computer radiation

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.

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.

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Spear and shield of health countermeasures

As the saying goes, the Tao is one foot high and the magic is ten feet high. In view of the harmfulness of computer electromagnetic radiation, relevant professional organizations and computer manufacturers at home and abroad have started the work of protecting computer radiation very early. After years of efforts, aiming at the production and manufacture of electronic products such as computers, we have formulated a number of strict certification standards such as MPR, TCO, FCC and UL from the aspects of radiation, energy saving, environmental protection and ergonomics to ensure that human health will not be harmed. At the same time, the so-called "green computer" with energy saving, environmental protection and no radiation has appeared in recent years.

At present, active protection and passive protection can be taken against the harm of computer electromagnetic radiation. Passive protection method, that is, in addition to improving the working environment and paying attention to the use method, measures such as providing radiation protection clothing, radiation protection screen, radiation protection curtain and radiation protection glass are taken. For people who often touch and operate computers, to reduce or eliminate the harm of electromagnetic radiation; The active protection method starts with the "source" of computer electromagnetic radiation, such as monitors and cabinets, and eliminates or shields it.

First, purchase, that is, choose and buy products that meet the "green computer" standard from powerful manufacturers in the market; The second is DIY, that is, buying "green" computer accessories that have passed various certification standards to build your own healthy computer. Below we will focus on how to choose accessories that meet the radiation protection standards to DIY healthy computers.

When using a computer, you need to adjust the brightness of the screen. 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 viewing effect because the brightness is too small, which is easy to cause eye fatigue.

When operating the computer, pay attention to 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 be 0.5M away from the screen.

In addition, after operating the computer, many particles of electromagnetic radiation will be absorbed into the face. Washing your face with clean water in time will reduce radiation exposure by more than 70%.

The other is drinking tea.

83% people who use computers often feel tired eyes, and 64% people often feel sore shoulders and low back pain. In addition, many people will have tears, loss of appetite, sore throat, cough, chest tightness and other symptoms, and even slow movement and memory loss.

Computer radiation not only harms people's health, but also affects the quality and efficiency of work. For busy people, the easiest way to resist computer radiation is to drink 2-3 cups of green tea and eat an orange every morning. Tea is rich in provitamin A, which can be quickly converted into vitamin A after being absorbed by human body. Vitamin A can not only synthesize rhodopsin, but also make eyes see things more clearly in dark light. Therefore, green tea can not only eliminate the harm of computer radiation, but also protect and improve vision. If you are not used to drinking green tea, chrysanthemum tea can also play a role in resisting computer radiation and regulating body functions.

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. As long as you can see clearly, the distance should be at least 50 cm to 75 cm, which can reduce the harm of electromagnetic radiation.

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.

Nursing: The most obvious part of facial aging is the eyes, so eye care is particularly important.

Eye cream: It has moisturizing effect, besides reducing the problems of dark circles and bags under eyes, it also has the effect of improving wrinkles and fine lines.

Eye gel: the effect is similar to that of eye cream, but the gel-like texture is more refreshing, and there is no burden to use the skin during the day. Most of them are to eliminate eye bags and dark circles and relieve eye skin symptoms.