The "cell phone brain cancer theory" was popular among the people, and this view has always been controversial in the scientific community. Edward Kennedy, the only long-lived brother of Democratic Senator and former President Kennedy, reached a climax after his death due to brain cancer: Kennedy's doctors suspected that his frequent use of mobile phones in government affairs was a major factor leading to brain cancer.
In the past, when studying the influence of mobile phone radiation on the brain, most of them were based on the macro-physiological reaction of the body. The team led by Laura Volcker, director of the National Institute of Drug Abuse of the National Institutes of Health, directly scanned the brain and measured the effects of electromagnetic radiation. * * * 47 volunteers accepted the experiment. Volunteers put their mobile phones to their ears for 50 minutes. At the same time, the researchers used positron emission tomography (PET) to measure glucose metabolism in their brains (one of the indicators to measure brain activity). It was found that when the mobile phone was put to the ear, the brain glucose metabolism of volunteers near the antenna area of the mobile phone increased by 7%. Statistically speaking, the experimental results are very reliable.
Volcker said that the importance of this research is that it faithfully presents the sensitivity of the human brain to electromagnetic radiation from mobile phones. Although the short-term effect is not clear, if we put it on a longer time scale, such as 10 or 20 years, the situation may be different and the scientific community needs to pay attention to it.
This result has led to various speculations about the adverse effects of mobile phones on the brain, and even worse, people's concerns about the "cell phone brain cancer theory" will intensify. There is a theory that the increase of glucose metabolism in the brain may produce free radicals, and too many free radicals will damage healthy cells. Another way of saying this is that continuous electromagnetic radiation can stimulate the brain, which is related to many health problems, including cancer.
Regardless of the impact of long-term use of mobile phones on human health, the situation of talking on the phone for 50 minutes in Volcker's experiment often happens in many people's daily lives. Some people who are worried about health problems choose headphones, thinking that it will be all right.
Keeping the cell phone antenna away from the brain can really significantly reduce electromagnetic radiation. Simple calculation also proves this point: the electromagnetic radiation generated by mobile phone decreases exponentially with the increase of the distance between human body and mobile phone. That's great. A pair of headphones, let us and health risks opened enough distance.
However, according to a report released by the British Consumers Association, using headphones when answering the phone will cause three times as much radiation to the head as not using headphones. The report believes that the problem lies in the earphone cable, which acts as an antenna during the call and brings unshielded electromagnetic radiation to the head.
The test results show that using headphones will not only increase the radiation absorbed by the head, but also reduce the radiation received by the mobile phone by 65%~70%. Research shows that most of the radiation is emitted through the back of the mobile phone, and the microphone and earpiece are generally on the front of the mobile phone, so the head should be safe, especially for new headphones with built-in antenna.
(Excerpted from Youth Reference)