This machine is either a backscatter X-ray or millimeter wave scanner. If the machine just looks like a flat wall, it’s probably a backscatter X-ray scanner. These use very small amounts of weak X-rays that only penetrate your clothes, and don’t go through your skin. The machine detects the radiation reflected by your skin and anything else under your clothes, and generates an image that easily shows anything you’re trying to conceal. The amount of X-ray radiation you’re exposed to in a backscatter scan is extremely low, a tiny fraction of the amount you’re about to be exposed to by flying on a plane. But still, this technology isn’t used very often, and it’s banned in many countries. Instead, millimeter wave scanners are much more common. They’re the cylindrical machines that look like futuristic phone booths, and they use the same basic principles as backscatter scanners. if you either want to travel to airport select shuttle service
Checking Through X-rays
But instead of X-rays, they emit microwaves, which are non-ionizing, meaning that they can’t damage your DNA, and you don’t need to worry about exposure. Since millimeter waves can penetrate through clothing, they can still show if you’re hiding something that you shouldn’t be. Once you make it through the scanner though, you might still be in for some follow-up tests. If security finds anything in your bag that looks suspicious, they’ll probably swab you for traces of explosives. A security officer might swab your hands, your shoes, or your bag, then place the swab in yet another machine for analysis. This is the Explosives Trace Detection machine, or ETD. The idea here is that, if you’ve been handling explosives, or if there were any inside your bag, the swab will pick up traces of suspicious , compounds. To analyze the swab, the ETD uses a process called ion mobility spectrometry. The machine gives the molecules on the swab an electric charge, turning them into ions. Then, a gas carries the ions through a tube. Different ions will take different amounts of time to pass through the tube, depending on things like their mass and charge. The machine then identifies different compounds based on how long it took them to move through the tube. So, airport security might be tedious and annoying. But at least now you know what’s happening to you and your carry-on.