h***s
发帖数: 507 | 1 【 以下文字转载自 NextGeneration 讨论区 】
发信人: hepes (WOW), 信区: NextGeneration
标 题: 借宝地问问题：办绿卡打指纹时人过的安检是不是x-ray的？
发信站: BBS 未名空间站 (Mon Feb 13 16:55:54 2012, 美东)
现在怀孕了，不能过x-ray啊？
还是有谁知道那个安检的东西到底是什么原理检测啊？
多谢了！ | C*******d
发帖数: 3345 | 2 不是x-ray，放心吧。不然那些做安检的工作人员早就先抱怨了吧
【在 h***s 的大作中提到】
: 【 以下文字转载自 NextGeneration 讨论区 】
: 发信人: hepes (WOW), 信区: NextGeneration
: 标 题: 借宝地问问题：办绿卡打指纹时人过的安检是不是x-ray的？
: 发信站: BBS 未名空间站 (Mon Feb 13 16:55:54 2012, 美东)
: 现在怀孕了，不能过x-ray啊？
: 还是有谁知道那个安检的东西到底是什么原理检测啊？
: 多谢了！
| m********1
发帖数: 220 | 3 In most airports, passengers walk through metal detectors, which use a low-
frequency electromagnetic field to look for weapons. Anything that generates
or uses electricity, such as power lines or household appliances, produces
an electromagnetic field. At the low levels a metal detector emits, this
exposure is considered safe for everyone, including pregnant women. (The
same holds true for the wands that security personnel sometimes pass over
individual passengers.)
Many people mistakenly think these metal detectors use X-rays – they don't.
Luggage X-ray machines do, though. They emit the same kind of radiation as
in a dental X-ray and are used only on your bags and other inanimate objects
going on the plane. You would have to place your hand through the curtain
of a luggage screening machine while the X-ray was on to be exposed to a
significant level of radiation.
There are now two new types of body scanning machines being installed in U.S
. airports. Both create an image of the surface of your body in order to
detect objects hidden under clothes. One, the "backscatter" machine, which
uses low-level X-rays, has raised health concerns. (The other, the "
millimeter wave" machine, which uses electromagnetic waves, is less
controversial.)
The Transportation Safety Administration (TSA) claims the potential for
dangerous radiation exposure from the backscatter machine is low and that it
doesn't pose a significant risk to pregnant passengers. The agency says
each scan emits less than 1/1,000 of the radiation given off in a standard
chest X-ray, or the equivalent of two minutes of high-altitude flight.
But some medical experts have questioned whether the machines have been
tested thoroughly enough and they're worried about what would happen if a
machine malfunctioned. If you have safety concerns or feel uncomfortable
being scanned, the TSA insists that you can opt for a physical "pat down"
search instead. You can find out more about the machines (known as Advanced
Imaging Technology) on the TSA website. |
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