Safety standards set by the International Commission on Non-Ionising Radiation Protection (ICNRP), which apply in the UK, state the amount of energy absorbed from an electric field or radio wave cannot exceed two watts per kilogram when averaged over 10 grams of tissue.
The Panorama researchers found the radiation levels in the Norwich classroom were 600 times lower than this guideline.
Vivienne Baron, of the campaign group Mast Sanity, said: "Many people have already fallen sick as a result of exposure to this microwave technology.
"Parents have not given consent for their children to be guinea pigs."
However, Prof Malcolm Sperrin, director of medical physics and clinical engineering at the Royal Berkshire Hospital, said: "Wi-fi is a technique using very low intensity radio waves.
"Some people suspect a non-thermal interaction but there is no evidence to suggest that this exists and indeed it is unlikely.
"Radio waves and other non-ionising radiations have been part of our lives for a century or more and if such effects were occurring then damage or other untoward effects would have been recorded and studied."
Oh for feck's sake, yet again we are teaching the children that primitive superstition against the magic of science outweighs any form of rational argument in favour of progress - give them all crystals to wear round their necks and brand them as sheep for life.