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Recent research has evaluated the use of computer vision based algorithms that operate on the volumetric data used collected as CT-slice images by these and other manufacturers computed tomography (CT) baggage scanner machines for the automatic detection of other threat types (e.g. guns, knives, liquid containers) using 3D object classification.
After September 11, 2001, the majority of airports around the world began to implement baggage screening directly into baggage handling systems.These systems are referred to as "Checked Baggage Inspection System" by the Transportation Security Administration (TSA) in the US, where bags are fed directly into Explosive Detection System (EDS) machines. [5]
Rapiscan X-ray backscatter scanner Advanced Technology (AT) X-ray systems for baggage scanning. Rapiscan Systems is an American privately held company that specialises in walk-through metal detectors and X-ray machines for screening airport luggage and cargo. The company is owned by OSI Systems. [1]
X-ray radiography is similar to gamma-ray radiography but instead of using a radioactive source, it uses a high-energy bremsstrahlung spectrum with energy in the 5–10 MeV range [8] [9] created by a linear particle accelerator (LINAC). Such X-ray systems can penetrate up to 30–40 cm of steel in vehicles moving with velocities up to 13 km/h.
X-ray machines, CTX machines, high-resolution x-rays and ETDs are also used to scan checked bags. All checked baggage is always x-rayed at all major commercial airports. CATSA launched its Restricted Area Identity Card (RAIC) program in January 2007. RAIC is the world's first dual biometric access control system for airports. [31]
An X-ray generator generally contains an X-ray tube to produce the X-rays. Possibly, radioisotopes can also be used to generate X-rays. [1]An X-ray tube is a simple vacuum tube that contains a cathode, which directs a stream of electrons into a vacuum, and an anode, which collects the electrons and is made of tungsten to evacuate the heat generated by the collision.
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