The harm of computer radiation
The radiation waves emitted by computers are often ignored. According to the international MPR radiation safety regulations, the radiation exposure within 50cm distance must be less than or equal to 25 V/m..
But do you know how much radiation the computer has? Computer radiation: 1, keyboard 1000V/m2, mouse 450V/m3, screen 2 18V/m4, host 170V/m5, notebook 2500 v/m.
In addition, radiated electromagnetic waves have eight hazards to human body:
1, promoting cell canceration.
2. Hormones are abnormal
3. Severe loss of calcium ions.
4. The onset of dementia
5. Abnormal pregnancy and abnormal delivery
6. Hypertension and heart disease
7, electromagnetic wave allergy
8. The increase in the number of suicides
When using a computer, you should pay attention to the four hazards of computer radiation as follows:)
1, computer radiation pollution will affect the circulatory system, immunity, reproduction and metabolic functions of human body, seriously induce cancer and accelerate the proliferation of cancer cells in human body. `
2. The reproductive system is mainly affected by the decline of male sperm quality, spontaneous abortion of pregnant women and fetal malformation. 2.}N
3. The cardiovascular system affecting people is characterized by palpitation, insomnia, menstrual disorder, bradycardia, decreased cardiac blood volume, irregular sinus heart rate, leukopenia and decreased immune function of some women. 5S
4. It has a bad influence on people's visual system. Because eyes belong to the sensitive organs of human body to electromagnetic radiation, excessive electromagnetic radiation pollution will also affect the visual system. Mainly manifested as decreased vision, causing cataracts and so on. Zc=
The results of the latest national supervision and spot check on the quality of computer products announced by the General Administration of Quality Supervision, Inspection and Quarantine yesterday show that the electromagnetic radiation in computers can not be ignored.
The General Administration of Quality Supervision, Inspection and Quarantine (AQSIQ) randomly selected computer products from Beijing, Shanghai, Tianjin, Chongqing, Zhejiang, Hubei and other four provinces and cities, and the sampling pass rate was 72%. It is understood that the results of this spot check show that the computing speed, multimedia functions and software and hardware support of computer products in the domestic market have been greatly improved, but the product quality level of some enterprises is not stable enough. In this spot check, the computer products of Stone, Hewlett-Packard, Muze and other well-known enterprises were also identified as unqualified products.
It is understood that the main quality problems found in this national supervision and spot check of computer product quality are that the radiation disturbance and conduction disturbance indexes in electromagnetic compatibility exceed the standard. Radiation disturbance is a kind of electromagnetic interference emitted into space when the computer is working, which will affect the normal work of other electrical appliances, especially high-sensitivity electrical appliances. Conducted interference will affect the normal work of other electrical appliances in the same power grid, such as motherboard, graphics card, switching power supply, display, keyboard, mouse and so on. , constitute the whole system. If the choice is not good, it will cause too much radiation interference. During the spot check, it was found that some enterprises did not understand the standards deeply enough, and the quality control of parts procurement and assembly of production lines was not strict, and the necessary testing means were lacking, resulting in unqualified products.
The seven companies, trademarks and models of microcomputer radiation disturbance found in this spot check are:
Beijing Stone Computer Technology Co., Ltd., Stone, shocked JS100; ;
Chongqing Xinbo Information Technology Development Co., Ltd., Xinbo, Free Village11kloc-0/;
Nanning Shengli Technology Co., Ltd., Victory, Leap Ⅰ;
Shanghai Taibo Computer Technology Co., Ltd., Taibo, BT-SMC-I 3298;
Wuhan Juxing Computer Co., Ltd., Shennaotong, JXSD530L；;
Beijing Heyuan Muze Technology Development Co., Ltd., Muze, E Fashion 510d; ;
Shanghai Hewlett-Packard Co., Ltd., Hewlett-Packard, P728 1—L2325.
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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]: protection
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.
The working imaging principle of CRT display determines that it is difficult to completely eliminate the harmful radiation it emits in use. In order to minimize the intensity of harmful radiation and protect the health of users, international authoritative organizations have successively issued a series of certification standards for electromagnetic radiation protection of electronic devices such as displays, from the initial MPR Ⅰ (1987), MPR Ⅱ (1990) and TCO'92( 1992) to the latest TCO'. Strict standards have been set for the radiation, energy saving, environmental protection and ergonomics of monitors. Only products that comply with the latest relevant standards in design, manufacturing and finished products can be called "green" displays.
At present, there are nearly 20 certification standards related to monitors. Among them, the famous certification standards are MPR of Swedish National Bureau of Metrology and Testing, TCO series of Swedish Professional Employees Union (TCO), EnergyStar of US Environmental Protection Agency (EPA), FCC of US Federal Communications Commission (FCC) and the latest 3C of China. The following focuses on understanding and mastering the common certification marks on several monitors.
1987, the Swedish Bureau of Surveying and Mapping, which was certified by MPR Ⅱ, put forward the earliest standard-MPR Ⅰ, about the influence of electric field and magnetic field radiation on human health. On this basis, 1990 is extended to MPRⅱII, which more strictly limits the magnetic field intensity generated by the display in use, and provides the display standard of 2 1, including flicker, jitter, linearity, brightness, reflectivity and font size, and puts forward the greatest restrictions on the ultra-low frequency (ELF) and very low frequency (VLF) radiation of the display. MPR standard has become a strict electromagnetic radiation detection standard recognized worldwide. At present, except for a few cheap products, most of the monitors on the market meet the MPR Ⅱ Ⅱ specification.
TCO Series Certification Swedish Professional Employees Union (TCO) starts from 1992. On the basis of MPR, higher requirements and stricter standards are put forward for the ecology, energy, emission and ergonomics of electronic devices such as displays, and it has gradually evolved into a worldwide scope, including TCO' 92/. Among them, TCO'92 is aimed at displays, including electromagnetic radiation, automatic power off, providing electricity consumption data, and meeting fire prevention and electricity safety standards; TCO'95 has increased the requirements for environmental protection and ergonomics on the basis of TCO'92, and emphasized the standards of low electromagnetic radiation and low magnetic field radiation, covering the display, keyboard and system unit. TCO'99 further puts forward stricter and more comprehensive standards for environmental protection and user comfort, and also puts forward specific provisions for the design of keyboards and notebook computers. As the fourth generation TCO certification standard, TCO'03 is better than TCO'99 in the aspects of monitor ecology, energy, radiation and ergonomics, and has become the most comprehensive and stringent certification standard for the new generation of high-quality monitors in the world.
FCC Certification The Federal Communications Commission (FCC) is an organization that tests electromagnetic wave signals and electronic equipment. The FCC certification issued by it mainly formulates electromagnetic specifications to limit the radiation noise of digital equipment and switching power supply. FCC certification is divided into two grades: A and B, and the technical requirements of Grade B are more stringent. Among them, Class A products produce strong electromagnetic waves, which will interfere with radios, televisions and other electrical appliances, so they are not suitable for home use but can be used in offices and other places; Class B products mean that the generated electromagnetic waves are relatively weak and will not interfere with signals such as microwaves, so they can be used in homes or offices, such as personal computers or telephones.
CCC Certification CCC is the abbreviation of "China Compulsory Product Certification", which is the symbol of compulsory product certification recently implemented in China. At the same time, 3C certification is a combination of CCEE (Electrician), CCIB (Import and Export Quarantine) and EMC (Electromagnetic Compatibility) certification, which respectively set comprehensive standards for electricity safety, electromagnetic compatibility, radio interference and stability. All products listed in the compulsory product certification catalogue implemented by the state must be certified by a certification body designated by the state, and can only be sold, imported and used in business activities after obtaining relevant certificates and affixing certification marks. 3C logo has two versions: CCC(S) and CCC (S&; & ampe). CCC(S) only passed the safety standard certification, CCC (S&; & ampe) indicates that the product has obtained both safety and EMC certification (as shown in Figure 2).
Understand and master the above certification standards, and you will "know fairly well" when purchasing "green" monitors. In fact, when purchasing, you only need to "follow the prescription" and choose those products that have passed TCO'99, TCO'03 and 3C certification. Because these products have passed the most stringent standards such as TCO'99, we should try our best to meet the standard requirements contained in relevant certification in every process and link of design, materials, manufacturing, delivery and sales. Therefore, it is basically unnecessary for users to know the specific technical details of the product. As long as it has passed the certification of TCO'99, it means that the electromagnetic radiation and other hazards of the product have been minimized and can be used safely. For example, the design of the display with TCO'95 should conform to ISO924 1 Ergonomics and IE950 safety standards, widely use recyclable environment-friendly non-toxic materials, and meet the relevant standards in ISO series and the requirements of low electromagnetic radiation (EMI) and low magnetic field radiation (EMC) in production, manufacturing and delivery. It can be seen that the TCO standard is not only very strict, but also its test process and test scheme are extremely demanding. Therefore, monitors that meet TCO'95 or above certification standards can meet the requirements of becoming "green" monitors in many aspects such as ecology, energy, radiation and ergonomics. It is a truly high-quality, high-security display, and it is certainly your wise choice. Judging from the proportion of certified displays, non-radiation and environmentally friendly TFT liquid crystal displays account for a large part. In order to prevent fraud, you can log on to the TCO evaluation agency official website (www. TCOdevelopment.com), and you can find all the manufacturers and brand names that have passed the TCO standard certification.
At present, there are many monitors on the market that have passed TCO'99 and above certification. Philips, LG, BenQ, Acer, AOC, Patriot, NESO, Meg and other big manufacturers have all launched their own excellent products.
The easiest way to judge whether the chassis has the function of anti-electromagnetic radiation is to check whether it has passed the certification of EMI, FCC, 3C and other relevant anti-radiation standards. At present, the typical products on the market are radiation-proof cabinets of Huaqi Patriot, Century Star, Jinhetian, Foxconn, Yinhe, Qicai and Tt.
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 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.
One 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.