With the development of radio communication technology, more and more people use mobile phones, and the related health problems brought by mobile phones have also attracted more attention. How much harm is the radiation of mobile phones to human body, how to minimize the degree of harm has become the topic that people are most concerned about.

â–  How to measure mobile phone radiation standards?

The standard for measuring cell phone radiation is SAR, which refers to the electromagnetic wave energy absorbed per unit time and unit mass, usually expressed in watts per kilogram. It is understood that the SAR value of most mobile phones currently on the market is between 0.5 and 1.0. The maximum value of SAR occurs when the mobile phone dials, and the SAR value will decrease sharply after the mobile phone is connected. Therefore, if the mobile communication network infrastructure is in place and planned well, mobile phone users will rarely reach the maximum SAR when talking on the phone. From the perspective of transmission power, various mobile phones are generally above a level, the maximum power of general GSM mobile phones is 2W, and the maximum power of general CDMA mobile phones is 1W. The distance between the electromagnetic radiation source and the human body becomes a decisive factor in determining the SAR value. The SAR value will increase a lot when the emission source is close to the human body by 1 mm. Therefore, various mobile phone manufacturers are working hard to improve this aspect, and strive to make the mobile phone antenna as far away from the human body as possible.

â–  Does cell phone radiation harm human health?

It is reported that the International Cancer Research Institute of the World Health Organization is conducting an international study on the relationship between mobile phone electromagnetic radiation and human brain tissue involving 13 countries. The results are expected to be announced within this year.

Whether cell phone radiation is harmful to human health has been debated. Mobile phone manufacturers and telecommunications experts almost agree that the use of mobile phones is harmless, while most biologists, medical scientists, and environmental protection experts believe that the use of mobile phones is harmful to human health. Previously, due to the different designs of some related experiments, the results were difficult to reach agreement. Some of these experiments believe that electromagnetic radiation from cell phones can cause neurasthenia, palpitations, chest tightness, dizziness, and mental insufficiency, and may even induce brain tumors, endanger fertility, and cause fetal malformations.

In many countries, the harm to mobile phone radiation is "Ning believes in what it has, not believes in nothing." The British government expressly prohibits minors under the age of 16 from using mobile phones. A US neurologist named Christopher Newman filed a lawsuit in court, demanding that Motorola and nine other companies compensate him 800 million dollars on the grounds that he used a mobile phone to get a malignant brain tumor.

Phone use in the car is very harmful to people, and the bigger the phone, the more harmful it is. City office workers generally answer mobile phones during commuting and commuting. Because the cars are all metal shells, a large amount of mobile phone electromagnetic waves are reflected back and forth in the car. The density of these electromagnetic waves greatly exceeds international safety standards and seriously affects everyone's health.

Generally speaking, the radiation of a mobile phone is smaller when it is in standby, and it is larger when it is in a call. When the mobile phone number has been dialed and not yet connected, the radiation amount is about 3 times that of the standby. These radiations may change human tissues and cause adverse effects on human health.

According to the comrades of the Indoor Environment Monitoring Working Committee of the China Interior Decoration Association, mobile phone radiation is more harmful to the human head, it can cause functional disorders of the human central nervous system, causing headaches, dizziness, insomnia, dreaminess and hair loss. Symptoms, some people will have a stimulating face. In the United States and Japan, there have been many cases of suspected brain tumors caused by cell phone radiation. A research report published by the European Journal of Cancer Prevention also pointed out that people who use mobile phones for a long time have a 30% higher chance of developing brain tumors than those who do not use them. People who have used mobile phones for more than 10 years are 80% more likely to develop brain tumors than those who do not. In addition, electromagnetic wave radiation will also affect normal cell metabolism, causing disturbances in the body of potassium, calcium, sodium and other metal ions.

â–  Can anti-magnetic stickers prevent radiation?

There are many mobile phone users who specifically choose imported mobile phones with plastic shells and purchase external antennas. In fact, these cannot effectively prevent radiation. On the contrary, they can only interfere with the signal of the mobile phone, making the communication between the mobile phone and the base station consume more power and may Produce more radiation. Of course, users should not be too concerned about the possible impact of the radiation generated by using mobile phones on human health. There is no need to take special protective measures, such as attaching antimagnetic stickers to mobile phones, which will not work at all.

The radiation source is the antenna of the mobile phone, and how does it work if the antimagnetic stickers are attached to the listeners? It is absolutely impossible to stick the antimagnetic stickers on the antenna, because it will change the magnetic field around the antenna, so that the signal of the antenna changes, and the call cannot be conducted normally.

Tsinghua University successfully developed China's first high-temperature superconducting filter system for CDMA mobile communications, which will reduce the radiation of CDMA mobile phones by 50%. By next summer, this technology is expected to be used in Beijing CDMA base stations.

â–  Where should I put my phone?

Some people like to use their mobile phones to chat at night and put their mobile phones next to their pillows when they sleep. This is a bad habit. Many girls like to hang their phones on their chests, which is also wrong. The mobile phone is hung on the chest, even in the standby state with less radiation, the electromagnetic wave radiation around the mobile phone will cause harm to the human body. People with impaired heart function and arrhythmia should pay special attention not to hang their phones on their chests. Electromagnetic radiation can also affect endocrine function, leading to women's menstrual disorders. The mobile phone is generally equipped with shielding equipment, which can reduce the harm of radiation to the human body. The shielding equipment containing heavy metals such as aluminum and lead has a better protection effect. But for the sake of beauty, women often choose compact mobile phones, and the protective functions of such mobile phones may not be perfect.

Hungarian scientists found that the number of sperm of men who often carry and use mobile phones can be reduced by as much as 30%. Some medical experts pointed out that if the mobile phone is often hung around the waist or abdomen of the human body, the electromagnetic waves generated when sending and receiving signals will be radiated to the sperm or egg in the human body, which may affect the user's fertility. The British experimental report pointed out that mice will be exposed to cell phone microwaves for 5 minutes, and DNA lesions will occur; human sperm and eggs are exposed to cell phone microwave radiation for a long time, and DNA lesions may also occur.

Experts recommend that male mobile phone users try to keep their phones away from their waists and abdomen, and do not hang their phones on their waists or put them in coat pockets. Some men tuck their phones in their trouser pockets, which poses the greatest threat to sperm, because the trouser pocket is next to the testicles. When the user is in the office, at home or in the car, it is best to put the phone aside. You can put your phone in your leather bag when you go out, so it is far away from your body.

■ Why should n’t teenagers use mobile phones?

In recent years, many parents have also bought mobile phones for their children. However, this approach has been opposed by relevant experts. They pointed out that it is better not to use cell phones prematurely. Adolescents have a weaker immune system than adults, so they are more susceptible to radiation.

Facts have proved that cell phone radiation can damage the nerves of teenagers' brains, causing headaches, memory loss and sleep disorders. And frequent playing mobile games may also deaf children. A research report published by British scientists also shows that because the ears and skulls of adolescents are smaller and thinner than adults, when children use mobile phones, the radiation absorbed in the brain is 50% higher than that of adults. For a 5-year-old child, radiation will penetrate 50% of the brain area, and 10-year-old child, radiation will penetrate 30% of the brain area. Today, mobile phones have long been separated from the meaning of just having a phone communication function, and mobile phone text messages, ringtones, pictures, etc. have been introduced with various websites, making many primary and secondary school students addicted to it. Some students also use the short message function to cheat during the exam, which has an adverse effect on students' learning and character building. In addition, the use of mobile phones by adolescents is also prone to comparison psychology, which affects their mental health.

Source: Beijing Youth Daily