The Transportation Security Administration is an agency of the United States Department of Homeland Security that has authority over the security of transportation systems within, and connecting to the United States. Travelers sometimes carry weapons or drugs to their destination. Airport security systems use metal detectors, backscatter x-ray machines, millimeter wave scanners, and cabinet x-ray machines to keep people safe while traveling
Some security devices use ionizing radiation to scan luggage. Safety measures are in place to make sure it does not expose workers and travelers to high-levels of ionizing radiation.
Some devices, such as metal detectors, use non-ionizing radiation to scan travelers and make sure there are not carrying hidden items.
Images of the tsa weapons scans are found on the internet.