How do X-ray and Gamma systems work?

What is the difference between X-ray and Gamma radiation?

X-rays and Gamma rays are identical. A Gamma photon looks exactly like an X-ray photon. Gamma rays are generated by the natural disintegration of a radioisotope, while X-rays are generated by an X-ray tube containing a cathode that emits electrons, which are accelerated toward the anode by a high voltage electric charge.  

Where do the Gamma sources come from?

The Gamma sources that Industrial Dynamics/filtec uses in our filtec inspection equipment is Americium-241. Americium-241 is a by-product of regular nuclear power reactors. Americium-241 results from the successive capture of neutrons by plutonium.