The scanning machines, called "backscatter scanners," deliver a dose of ionizing radiation equivalent to 1 percent or less of the radiation in a dental X-ray.

扫描机，所谓的“反射散射扫描仪”，发射出的电离辐射剂量相当于牙科辐射X射线的1%或更少。

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Britain plans to use whole-body scanners and may test the backscatter system.

英国计划使用全身扫描仪，可能会测试后向散射系统。

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Rapiscan backscatter scanners use low-dose x-rays to do the same.

BBC: Radiation-free full-body scanners

The TSA plans to deploy 1, 275 backscatter and millimeter-wave scanners covering more than half its security lanes by the end of 2012 and 1, 800 covering nearly all the lanes by 2014.

FORBES: Europe Bans Airport Body Scanners For "Health and Safety" Concerns

But Congress voted to require all body scanners to have privacy-protecting software, and the TSA announced in February it was phasing out backscatter systems because they could not meet the new standard.

CNN: TSA removes body scanners criticized as too revealing