The potential harmful effect of Wi-Fi radiation will come under scrutiny in a BBC Panorama programme tonight.
The BBC found that radiation levels from Wi-Fi in one school was up to three times the level of mobile phone mast radiation. Schools are increasingly installing Wi-Fi networks to aid learning.
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While the readings were 600 times below the government's radiation safety limits, the programme is expected to fuel the debate over potential risks of Wi-Fi - particularly among young children who could be under greater risk.
In the Panorama programme, the measured Wi-Fi signal strength in a classroom at a Norwich school was three times higher than the main beam of radiation intensity from a mobile phone mast.
The UK Health Protection Agency has recommended that the beam of greatest intensity from any phone mast should not fall on any part of school grounds, unless the school and parents have agreed to it.
The Panorama programme is broadcast at 8.30pm tonight on BBC1 (21 May 2007).
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