X FAY EMISSION

• X-rays are emitted through a window in the glass or metal enclosure of the x-ray tube in the form of a spectrum of energies.
• The x-ray beam is characterized by the number of x-rays in the beam and the average energy of the beam.
• Various factors affect the intensity and energy of the x-ray beam.
• The intensity of the x-ray beam of an x-ray imaging system is measured in milligray in air and is the air kerma (kinetic energy released in matter).
• Other terms, quantity and radiation exposure, are often used to refer to the same measurement in mGya.