Types of ionizing radiation

• Gamma and x rays are photons with no mass or charge that travel at the speed of light
• Gamma rays often accompany alpha and/or beta decay
• X rays result from events in the electron cloud and from the deceleration or deflection of charged
  particles as they pass by nuclei (bremsstrahlung)
• Gamma and x rays are highly penetrating and therefore an external hazard
  

By Ulflund - This figure is a compilation of different images from wikimedia commons.The graph at the top I have made myself, originaly uploaded as own workThe crystallography image is from File:Lysozym diffraction.png by user:Del45. The mammography image is from File:40F MLO DMMG.png by Nevit Dilmen (talk).The CT image is from File:Ct-workstation-neck.jpg by en:User:ChumpusRex. The luggage scanner image is from File:Luggage screening at VTBS.JPG by user User:Mattes., CC BY-SA 3.0 ,https://commons.wikimedia.org/w/index.php?curid=22545004