Airport security is the most awkward, confusing,  and tedious part of every trip!  After spending an hour or so marinating in  a long line, you and your bags are scanned  with who-knows-what kind of technology, zapped  with who-knows-how much radiation, and possibly  wiped down with a little swab for who-knows-what  reason.  Well, we can’t make airport security suck  any less.  But we can explain exactly what’s being  done to you and your bags … what you’re  being exposed to … and how the science of  security works these days.  When you get to the security line, one of  the first things you see is probably the bag scanner.  The scanner uses X-rays to detect objects  inside your bag, as well as how dense they are.  One side of the machine emits both low- and  high-energy X-rays, which pass through your  bag and hit detectors on the other side.  When the X-rays pass through your bag and  its contents, some of them get absorbed.  Objects with lower density, like stuff that’s  made of organic materials, will allow more  of the lower-energy X-rays to pass through.  And things with higher density will absorb  most of the low-energy X-rays, and allow some  of the higher-energy rays to pass through.  Based on the X-rays that reach the detector,  the machine generates an image that shows  all the different objects in your bag, colored  based on their density.  If something is colored orange, for example, that means it’s probably made of organic  material — that is, something that contains  carbon.  That’s important for security to know, because  explosives tend to involve organic compounds.  The security team analyzes the image for anything  suspicious, like the outline of a gun or a  bunch of organic material hidden inside a  shoe.  With all those X-rays scanning thousands of  bags every day, you might think that security  personnel would be exposed to a lot of radiation.  But the X-rays are confined to the machine,  so the amount of radiation that workers are  exposed to is so low that they aren’t even required to wear badges that monitor radiation exposure.  While your bag goes through the X-ray machine,  you’ve probably been asked to step through  some kind of scanner yourself.  Until a few years ago, that scanner was usually  a metal detector.  Metal detectors work by generating a current  in a coil of wire in short pulses, each of  which briefly creates a magnetic field within  the detector.  When a metal object passes through the detector,  this magnetic field creates another current  in the metal, which in turn generates another  magnetic field around the object.  The interference caused by this magnetic field  is what sounds the alarm.  But these days, you’re probably not asked  to step through a metal detector.  Instead, you walk into some big machine and  raise your hands. always choose reliable service. if you want to travel to airport or airport to home in UK ,

Leave a Reply

Your email address will not be published. Required fields are marked *