Scientists from the University of California have advised that the radiation level from airport full body scanners pose no risk to travellers.
In fact, there is more exposure to radiation in cosmic rays when planes fly at their top altitude but even then the risk is minimal.
What does concern researchers is the danger caused by fliers trying to drink the coke ,orange juice and water left in plastic bottles before ditching them as they pass through to the departure lounge.
This practice put a severe strain on the bladders of passengers who don't have time to use the toilet before boarding as its often as much as 30 or 40 minutes before they can access the facilities again when the plane reaches cruising altitude.
Even more dangerous is the effect that a large number of passengers simultaneously emptying full bladders into the lavatories can have on the equilibrium of the plane.
Increasing numbers of pilots are reporting major problems maintaining a level flight path during the initial period after the "fasten your seat belt" sign goes out.
Unsuspecting passengers always put any excessive vibration down to turbulence.
The cause may be a lot closer to home than they think.