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"X-Ray scanners at British airports could be exposing passengers to potentially dangerous levels of radiation, according to one senior radiologist.
The machines are designed to "strip search" passengers by using low-level X-Rays, which produce an image of their bodies, revealing whether they are secretly carrying weapons, explosives or illegal drugs.
But the scanners may not be safe for certain people, particularly children and women in the early stages of pregnancy, according to Dr Sarah Burnett, who works as an independent radiologist in London.
"I am particularly concerned about the potential effects on women in their first trimester of pregnancy.
"That is when the risks of the baby developing genetic abnormalities are highest because radiation exposure can damage the body's reproductive DNA."
The X-Rays penetrate one-tenth of an inch into the body, enough to detect any devices or drugs hidden just under the skin.
The company who makes the scanners says that frequent flyers would need to have at least 5,000 scans a year before there would be any health threat.
What's more, it adds that longhaul passengers will soak up more so-called radiation during the flight, from the plane's equipment, than from the scan.
However, last year the Transport and General Workers Union investigated claims that five female security guards suffered miscarriages as a result of exposure to radiation from the machines at Heathrow.
"The machines are referred to as 'low-dose', but there is a school of thought that there is no 'safe' radiation dose," said Dr Burnett, who has had 15 years' experience.
"We can, however, avoid deliberately exposing people to radiation."
The British Airports Authority said passengers are free to refuse the X-Ray. But if they do, they will then have to be hand-searched.
Dr Gill Markham from the Royal College of Radiologists urged passengers not to worry, as the dose is so low it is unlikely to cause harm.
But women who think they may be in the early stages of pregnancy should tell airport staff and ask to be hand-searched.