The radiation of mobile phones must be tested by a professional EMC laboratory. The Taier Laboratory is specially designed to test the radiation amount of mobile phones.
I personally think that PHS has the smallest electromagnetic radiation because it has the smallest transmit power and long standby time.
The radiation of CDMA and GSM mobile phones is similar, but the frequency of emission is different.
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. Effects on people’s cardiovascular system include 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 the 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 Sitong, 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), and light (ultraviolet rays) 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, air, and noise. It has become an invisible "killer" that harms human health. Protection against electromagnetic radiation has become a top priority.