Mobile phones heat users? brains, and the heat transmitted is near the top end of international safety recommendations. According to a study by four Finnish institutes, the heat does not pose health hazards, but they have called for more research.
The institutes have just completed an examination of the effects of radio frequencies used by mobile phone on the brains of 19 people and on mice. Human brains can absorb up to 60 per cent of the energy from mobile phone radio waves, but they would still be well below biologically risky levels. A researcher at the Finnish Centre for Radiation and Nuclear Safety said human brains should not be exposed to more than two watts of energy per kilogramme of head weight, and that the maximum exposure from a mobile phone was near that limit.
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