Are you being exposed to Radiation when you walk through a scanner in Air Port?

Luggage Scanners-
There is nothing for you to worry about. An airport x-ray machine is very similar to x-ray machines used by federal and state agencies to screen briefcases and packages. They give off much lower doses than x-ray machines in hospitals. You could almost say they are immeasurable. They are designed this way because they do not have to see as much detail and are not designed for looking into very large objects. They are usually only looking for things that really stand out on images like metal.
The only devices in your luggage that you should be worried about would be your camera film, but since everything has gone digital these days you probably won’t even have to worry about that, as for food items the radiation coming from the airport exposure is too low to affect anything.
Pets are also safe, because only the pet carrier will be sent through the airport x-ray. The same goes for clothing; the radiation of the scanner is too small to degrade the materials. The manufactures of these scanners indicate that the radiation exposure to an item is about 1/10th of the exposure we get every day from natural radiation in our environments.

People Scanners-
It is true that some walk-through x ray scanners are actually being used to screen people before getting on an airplane. You might see one of these in a large international airport such as Heathrow in London.
You must remember next time you step into one of those scanners that there is actually very little radiation dose for a person passing through the scanner because they are not trying to see the detail of our "soft" tissues as is done in medical examinations. They are looking for items that will stand out pretty easily.

The American National Standards Institute, in its standard N43.17-2002 "Radiation Safety for Personnel Security Screening Systems Using X-Rays," the maximum effective dose an individual could receive when walking through this scanner is 0.01 mrem (millirem) For some perspective on the level of this dose, the annual effective dose each of us receives from background radiation is about 360 mrem; the effective dose from one chest x ray is about 10 mrem.

Metal Detectors-
This type of machinery does not expose you to ionizing radiation, neither do the wands that are used for individual screening. Metal detectors operate by generating a low-intensity magnetic field that passes from one side of the detector to the other. If metal objects pass through that field, the magnetic field will induce a second field in the metal object. Since that second field is a disruption of the first field, the detector senses the change and sets off an alarm. Magnetic fields are a form of radiation, but they are called "nonionizing" radiation. This means that magnetic fields do not generate additional, damaging radiation the way that ionizing radiation (or X rays) does. Magnetic fields below certain intensities are considered to be safe in that they will not cause any biological damage to an individual. As a reference, MRI (magnetic resonance imaging) is considered safe and uses much higher magnetic field intensity than a metal detector. In summary, because of its nonionizing properties, the magnetic field generated in a metal detector will not cause harm to persons even with routine and/or repeated scanning.
I work for a major airline and will be required to spend eight hours a day near the new baggage x-ray machines (the big ones that I think are CT machines) that TSA (Transportation Security Administration) uses. We have been given a handout saying that TSA has determined that the machines are not dangerous and that we do not need film badges. How can anyone say working near radiation is not dangerous if it is not monitored in any way?

Newer Luggage Scanners-
Some of the newer x-ray machines used to scan checked luggage use computerized tomography (CT) technology—just like those used in medicine. The main difference between the two types of use (security at airports and medical diagnosis) is that the machines used in airports have more shielding to stop the scattered radiation—nearly the entire luggage belt is shielded where, in medicine, the patient table is not shielded—and they subject the baggage to lower doses because the image does not need to be as clear as it does for a patient.

Someone standing next to the unit in airports would receive little, if any, radiation exposure. Radiation emitted around a piece of equipment when it is operating is determined at the manufacturer and, sometimes, checked by the purchaser. A manufacturer must assure the equipment is operating within federal regulations that govern x-ray equipment, which in this case is 0.5 mR/h at 5 cm from the unit (mR or milliroentgen is a unit of radiation exposure) though performance studies of the equipment indicate that the average exposure rate was about 0.08 μR (microroentgen, one-one thousandth of a milliroentgen) per scan (NCRP Report 95). Purchasers can use the manufacturer's assurance and/or can perform their own surveys on the equipment. The dose to the luggage is very low and there is no detectable radiation outside the machines according to one manufacturer.