The dangers of computer radiation
The radiation waves emitted by computers are often ignored by people. According to the international MPRⅡ radiation safety regulations: the radiation exposure must be less than or equal to 25V/m within a distance of 50cm.
But do you know how much radiation a computer emits? Computer radiation: 1. Keyboard 1000V/m2, mouse 450V/m3, screen 218V/m4, host 170V/m5, Notebook 2500V/m
In addition, radiated electromagnetic waves cause eight major harms to the human body:
1. Promotion of cell cancer
2. Abnormal hormones
3. Intense loss of calcium ions
4. Cause of dementia
5. Abnormal pregnancy and abnormal birth
6. Hypertension and heart disease
7. Electromagnetic wave allergy
8. Increase in suicides
When using computers, you should pay attention to the following four major hazards of computer radiation:!)
1. Computer radiation pollution will seriously affect the human body’s circulatory system, immunity, reproduction and metabolic functions. It can also induce cancer and accelerate the proliferation of cancer cells in the human body. `
2. The main manifestations of affecting people's reproductive system include reduced sperm quality in men, spontaneous abortion and fetal malformations in pregnant women. 2.}N
3. The cardiovascular system that affects people includes palpitations, insomnia, menstrual disorders in some women, bradycardia, reduced cardiac blood volume, sinus arrhythmia, leukopenia, immune Functional decline, etc. 5S
4. It has adverse effects on people’s visual system. Since the eyes are the sensitive organs of the human body to electromagnetic radiation, excessive electromagnetic radiation pollution will also affect the visual system. The main manifestations are decreased vision and cataracts. Zc=
The results of the latest national supervision and inspection of computer product quality announced yesterday by the General Administration of Quality Supervision, Inspection and Quarantine show that electromagnetic radiation in computers cannot be ignored.
The General Administration of Quality Supervision, Inspection and Quarantine of the People’s Republic of China randomly inspected computer products from 14 provinces and cities including Beijing, Shanghai, Tianjin, Chongqing, Zhejiang, and Hubei, and the sampling pass rate was 72%. It is understood that the results of this spot check show that the computer products currently on the domestic market have greatly improved in terms of computing speed, multimedia functions and software and hardware support, but the product quality level of some companies is not stable enough. In this spot check, computer products from well-known companies such as Stone, HP, and Muze were also identified as substandard products.
It is understood that the main quality problem discovered during this national inspection and spot check of computer product quality is that the radiation harassment and conduction harassment indicators in electromagnetic compatibility exceed standards. Radiation disturbance is a kind of electromagnetic wave interference emitted into space when the computer is working. This interference will affect the normal operation of other electrical appliances, especially high-sensitivity appliances; conductive harassment will affect the normal operation of other electrical appliances in the same power grid, such as those that make up the whole machine. System motherboards, graphics cards, switching power supplies, monitors, keyboards, mice, etc., if not purchased properly, will cause radiation disturbance to exceed the standard. During the random inspection, it was found that some companies had insufficient understanding of the standards, lax parts purchase control and production line assembly quality control, and lacked necessary testing methods, resulting in substandard product quality.
The seven companies, trademarks and models of microcomputer radiation harassment found in this spot check are:
Beijing Sitong Computer Technology Co., Ltd., Sitong, Shocking JS100;
Chongqing Xinbo Information Technology Development Co., Ltd., Xinbo, Free Village 1101;
Nanning Shengli Technology Co., Ltd., Shengli, Leap I;
Shanghai Botai Computer Technology Co., Ltd. Company, PATEO, BT-SMC-I3298;
Wuhan Juxing Computer Co., Ltd., Shenaotong, JXSD530L;
Beijing Heyuan Muze Technology Development Co., Ltd., Muze Ze, E Fashion 510D;
Shanghai Hewlett-Packard Co., Ltd., HP, P7281-L2325.
Uncovering the X-Files of Computer "Radiation"
As the saying goes: There is no pure gold. Computers, as a modern high-tech product and electrical equipment, bring more convenience, efficiency and joy to people's lives, but they also have some adverse factors that are harmful to human health.
The hidden dangers of computers to human health, from the perspective of radiation types, mainly include electromagnetic radiation (various electromagnetic rays and electromagnetic waves, etc.), sound (noise), light (ultraviolet rays, etc.) generated and emitted by computers when they are working. , infrared radiation, visible light, etc.) and other radiation "pollution".
From the perspective of radiation sources, they include CRT monitor radiation sources, chassis radiation sources, and peripheral equipment radiation sources such as speakers, printers, and copiers. Among them, the imaging principle of CRT (cathode ray tube) monitor determines that it is difficult to completely eliminate harmful radiation during use. Because when it is working, its internal high-frequency electron gun, deflection coil, high-voltage package and peripheral circuits will generate such things as ionizing radiation (low-energy X-rays), non-ionizing radiation (low-frequency, high-frequency radiation), electrostatic electric field, optical radiation ( Including ultraviolet, infrared radiation, visible light, etc.) and other rays and electromagnetic waves. The LCD monitor uses the physical properties of liquid crystal. Its working principle is completely different from that of the CRT monitor. It is a naturally radiation-free (negligible) and environmentally friendly "healthy" monitor; various components inside the chassis, including high frequency, power High-power CPUs, various boards with main chips integrating a large number of transistors, optical drives, floppy drives and hard drives with high-speed DC servo motors, several cooling fans and transformers inside the power supply, etc., will emit low frequencies when working. Radiation and noise interference such as electromagnetic waves. In addition, radiation sources from peripheral equipment such as external speakers and copiers are also "sources" that cannot be ignored.
From the perspective of 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 can cause direct damage to the human reproductive system, nervous system and immune system. It is the main cause of cardiovascular disease, diabetes, cancer mutation and causes miscarriage, infertility and malformation in pregnant women. It can directly affect the development of body tissues and bones of minors, causing a decrease in vision, memory and hematopoietic function of the liver. In severe cases, it can lead to retinal detachment. In addition, electromagnetic radiation also poses hidden dangers to information security. Special signal receiving equipment can be used to receive and decipher it, leading to information leakage and unnecessary losses. Excessive electromagnetic radiation can also interfere with other surrounding electronic equipment, affecting its normal operation and causing electromagnetic compatibility (EMC) problems.
Therefore, electromagnetic radiation has been listed by the World Health Organization as the fourth largest source of environmental pollution after water, atmosphere, and noise. It has become an invisible "killer" that harms human health. Protection against electromagnetic radiation has become a top priority.
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]: Protection
Spear and Shield of Health Countermeasures Plan A
As the saying goes: The devil is as high as the Dao. . In view of the harmfulness of electromagnetic radiation from computers, relevant international and domestic professional institutions and computer manufacturers have begun work on protecting computer radiation very early. After years of efforts, a variety of strict certification standards such as MPR, TCO, FCC, and UL have been formulated in terms of radiation, energy saving, environmental protection, ergonomics, etc. for the production and manufacturing of computers and other electronic products to ensure that human health is not affected by damage. At the same time, so-called "green computers" that are energy-saving, environmentally friendly, and radiation-free have also emerged in recent years.
With regard to the harm of electromagnetic radiation from computers, two methods, active protection and passive protection, can currently be adopted. The passive protection method means that in addition to improving the working environment and paying attention to usage methods, measures such as providing radiation-proof clothing, radiation-proof screens, radiation-proof curtains, and radiation-proof glass to personnel who often come into contact with and operate computers are used to reduce or eliminate electromagnetic radiation. Harm; the active protection method starts from the "source" of computer electromagnetic radiation - the display, chassis and other components, and eliminates or shields them.
The first is to purchase, that is, to purchase products that meet the "green computer" standards launched by powerful manufacturers on the market; the second is to DIY, that is, to purchase "green" computer accessories that have passed various certification standards to create your own health computer. Below we will focus on how to choose accessories that meet radiation protection standards to DIY a healthy computer.
The working imaging principle of the CRT monitor determines that the harmful radiation emitted during use is difficult to completely eliminate. In order to minimize the intensity of harmful radiation and protect the health of users, international authoritative organizations have successively launched a series of electromagnetic radiation certification standards for electronic equipment such as displays, starting from the original MPRⅠ (1987), MPRⅡ (1990) , TCO'92 (1992) to the latest TCO'99 and TCO'03 (Figure 1), strict standards have been set for the radiation, energy saving, environmental protection, ergonomics and other aspects of the display. Only in the design, manufacturing and finished products Only products that comply with and pass the latest relevant standard testing in other aspects can be called "green" monitors.
Currently, there are nearly 20 certification standards related to monitors. Among the more famous ones are: MPRⅡ of the Swedish National Measurement and Testing Agency, TCO series of the Swedish Professional Employees Union (TCO), EnergyStar (Energy Star) of the US Environmental Protection Agency (EPA), FCC of the US Federal Communications Commission (FCC), China The latest 3C and other certification standards. Below we focus on understanding and mastering several common certification marks on monitors.
MPRⅡ certification The Swedish Measurement and Testing Agency proposed one of the earliest standards - MPRⅠ in 1987 on the impact of electric field and magnetic field radiation on human health. On this basis, it was expanded to MPRⅡ in 1990, which more strictly limits the intensity of the magnetic field generated by the display during use, and provides 21 display standards, including flicker, jitter, linearity, brightness, reflectivity and fonts. Size, etc., imposes the greatest limitations on the monitor’s ultra-low frequency (ELF) and very low frequency (VLF) radiation. The MPRⅡ standard has become a globally recognized and relatively strict electromagnetic radiation detection standard. At present, except for a small number of cheap products, most monitors on the market comply with the MPRⅡ specification.
TCO series certification The Swedish Professional Employees Union (TCO) began in 1992 on the basis of MPRⅡ to certify electronic equipment such as displays in Ecology, Energy, Emissions and Ergonomics. Ergonomics and other aspects have put forward higher requirements and stricter standards, which have gradually evolved into the TCO series of standards currently used in the world, including TCO'92/TCO'95/TCO'99/TCO'03, etc. . Among them, TCO'92 is a standard for displays including electromagnetic radiation, automatic power off, providing power consumption data, and compliance with fire prevention and electricity safety. TCO'95 adds environmental protection and safety standards to TCO'92. Ergonomic requirements emphasize low electromagnetic radiation and low magnetic field radiation standards, which cover monitors, keyboards, and system units. TCO'99 further proposes stricter and more comprehensive standards for environmental protection, user comfort, etc. , also put forward specific regulations on the design of keyboards and portable computers. As the fourth generation TCO certification standard, TCO'03 has stronger regulations on the ecology, energy, radiation and ergonomics of the display than TCO'99 except for radiation. It has become the world's most comprehensive and stringent certification standard for a new generation of high-quality displays.
FCC Certification The Federal Communications Commission (FCC) of the United States is an organization that inspects electromagnetic wave signals and electronic equipment. The FCC certification it issued mainly formulates electromagnetic specifications and limits the amount of radiated noise emitted by digital equipment and switching power supplies. FCC certification is divided into two levels: A and B. Level B's technical requirements are more stringent.
The electromagnetic waves generated by Class A products are relatively strong and can 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; while Class B products mean that the electromagnetic waves generated are relatively weak and will not It interferes with microwave and other signals, so it can be used at home or in the office, such as personal computers or telephones.
CCC certification CCC is the abbreviation of "China Compulsory Cerlification (China Compulsory Cerlification)" and is a newly implemented compulsory product certification mark in my country. At the same time, 3C certification is also a three-in-one combination of the original CCEE (electrician), CCIB (import and export quarantine), and EMC (electromagnetic compatibility) certification, which respectively makes comprehensive regulations on electricity safety, electromagnetic compatibility, radio wave interference, and stability. standard. All products included in the national compulsory product certification catalog must be certified by a nationally designated certification agency, obtain relevant certificates, and affix a certification mark before they can be sold, imported, and used in business activities. There are two versions of the 3C mark: CCC (S) and CCC (S&E). CCC (S) means that it has only passed safety standard certification, while CCC (S&E) means that the product has obtained both safety and electromagnetic compatibility certification (Figure 2).
Understand and master the above certification standards, and you will have a "knowledge" when purchasing a "green" monitor. In fact, when purchasing, you only need to follow the prescription and select products that have passed TCO’99, TCO’03, 3C and other certifications. Because these products have passed the most stringent standards such as TCO’99, they must try their best to comply with the standard requirements contained in relevant certifications in every process and link such as design, materials, manufacturing, factory, and sales. Therefore, there is basically no need for users to understand the specific technical details of the product. As long as it has passed TCO'99 and other certifications, it means that the hazards of electromagnetic radiation and other hazards of the product have been minimized and it can be used safely. For example, a monitor that has passed TCO'95 must comply with ISO9241 ergonomics and IE950 safety standards when designing. It must widely use recyclable, environmentally friendly and non-toxic materials in materials. It must comply with the requirements during production, manufacturing and delivery. Relevant standards in the ISO series and requirements for low electromagnetic radiation (EMI), low magnetic field radiation (EMC), etc. It can be seen that TCO not only has very strict standards, but also its testing process and test plan are also extremely demanding. Therefore, monitors that meet TCO'95 or above certification standards can meet the requirements of "economy, energy, radiation, ergonomics and other aspects". "Green" monitor requires a truly high-quality, high-security monitor, which is of course your wise choice. Judging from the proportion of certified monitors, radiation-free and environmentally friendly TFT LCD monitors account for a larger proportion. In order to prevent fraud, you can log on to the official query website of the TCO evaluation agency (www.TCOdevelopment.com), and you can check all manufacturers and brand names that have passed the TCO standard certification.
There are currently many monitors on the market that have passed TCO'99 and above certifications. Major manufacturers such as Philips, LG, BenQ, acer, AOC, aigo, NESO, and Meiko have all launched their own excellent monitors. product.
When purchasing a chassis, the easiest way to determine whether it has anti-electromagnetic radiation function is to check whether it has passed relevant radiation protection standard certifications such as EMI, FCC, 3C, etc. The more representative typical products currently on the market include radiation-proof chassis from Huaqi Patriot, Century Star, Jinhetian, Foxconn, Galaxy, Colorful, Tt and other brands.
When using a computer, you must adjust the brightness of the screen. Generally speaking, the brighter the screen, the stronger the electromagnetic radiation, and vice versa. However, it cannot be adjusted too dark, so as not to affect the viewing effect due to too low brightness and easily cause eye fatigue.
When operating the computer, be sure to maintain an appropriate distance from the screen. The closer you are to the screen, the greater the electromagnetic radiation the human body will receive, so it is better to be 0.5M away from the screen.
In addition, after operating the computer, a lot of electromagnetic radiation particles will be absorbed on the face. Wash your face with clean water in time, which will reduce the radiation exposure by more than 70%.
The placement of the computer is very important. Try not to let the back of the screen face people, because the computer radiates the strongest radiation from the back, followed by the left and right sides, and the front of the screen radiates the weakest. As long as the words can be read clearly, the distance should be at least 50 cm to 75 cm. This can reduce the damage of electromagnetic radiation.
Pay attention to indoor ventilation: Scientific research has confirmed that computer screens can produce a carcinogen called brominated dibenzofurans. Therefore, it is best to install a ventilation fan in the room where the computer is placed. If not, pay special attention to ventilation when surfing the Internet.
Care: The most obvious part of facial aging is the eyes, so eye care is particularly important.
Eye cream: It has moisturizing effect. In addition to reducing the problems of dark circles and eye bags, it also has the effect of improving wrinkles and fine lines.
Eye gel: The effect is similar to that of eye cream, except that the gel-like texture is more refreshing when applied. It does not burden the skin when used during the day. It can mostly eliminate eye bags and dark circles and soothe eye skin symptoms.
One way is to drink tea
83% of people who frequently use computers feel eye fatigue, and 64% often feel shoulder and back pain. In addition, many people suffer from tears, loss of appetite, Symptoms include sore throat, cough, chest tightness, 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 people who live a stressful and busy life, the easiest way to resist computer radiation is to drink 2 to 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 the body. Vitamin A can not only synthesize rhodopsin, but also enable the eyes to 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.