20110302

This is the VOA special english health report.
How important is your mobil phone, better known to Americans as a cell phone.".."
So far no studies have proven be on question that the radio signals from cell phones cause brain cancer or other health problems. But a new study by goverment scientists in the US has some people wondering what to think.
The scientists found that holding a cell phone to your ear for at least 50 minutes increases brain cell activity. Even the scientists themseleves are not sure about the meaning of their findings. Dr.Novercuv lead the study, she heads the national institude on drug abuse part of the national institude of health. Dr.Novercuv says she would not be concerned that 50 minutes of cellphone exposion would harm anyone. But she says the research does show the need to study whether or not there are long lasting effects of repeated exposion over several years.
Her team studied 47 healthy violenteers between Jan. and Dec. of 2009. The violenteers had cellphones placed aganist both ears while the scientists made images of their brain activity. As a part of test, one phone was activitied but miuted for fifty minutes, the other phone was off. After that, the people were tested with both phones turned off. Dr.Novercuv says the brain scans showed increased activity in brain cells closes to the activitied phone. "..."
The scans should how the brain cells use trigger to produce energy, a normal activity. The activity was 7% higher in areas of brain closes to the cellphone and taner. The study appeared in the Janeral of the American medical Association. Experts says, people who are considered about mobilphones can takes steps like using a wild handsets.
Dr.Jusan is a newclear medicine expert at John university medical center in Washington. He says after many years of studies, better kinds of research are still needed to settle questions about cellphone safety. The study would take years. ".."