June 02, 2011
Posted by: djogjaku ?: ?Category: Environment, Health News
A World Health Organization panel has concluded that mobile phones are ?possibly carcinogenic,? putting the popular devices in the same category as certain dry cleaning chemicals and pesticides, as a potential threat to human health.
The finding, from the agency?s International Agency for Research on Cancer, adds to concerns among a small but growing group of experts about the health effects of low levels of radiation emitted by mobile phones.
The panel, which consisted of 31 scientists from 14 countries, was led by Dr. Jonathan M. Samet, a physician and epidemiologist at the University of Southern California and a member of President Obama?s National Cancer Advisory Board. The group didn?t conduct any new research but reviewed numerous existing studies that focused on the health effects of radio frequency magnetic fields, which are emitted by mobile phones.
For years, concerns about the health effects of mobile phones have been largely dismissed because the radio frequency waves emitted from the devices are believed to be benign. Mobile phones emit nonionizing radiation, waves of energy that are too weak to break chemical bonds or to set off the DNA damage known to cause cancers. Scientists have said repeatedly that there is no known biological mechanism to explain how nonionizing radiation might lead to cancer or other health problems.
This year, The Journal of the American Medical Association reported on research from the National Institutes of Health, which found that less than an hour of mobile phone use can speed up brain activity in the area closest to the phone antenna. The study was among the first and largest to document that the weak radio frequency signals from mobile phones have a measurable effect on the brain. The research also offers a potential, albeit hypothetical, explanation for how low levels of nonionizing radiation could cause harm without breaking chemical bonds, possibly by triggering the formation of free radicals or an inflammatory response in the brain.
But the panel stressed the need for more research, pointing to incomplete data, evolving technology and changing consumer habits. The debate will go on; except this is the first statement from the W.H.O. saying we should be careful with exposure to this kind of radiation.
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