Exercise (Prelim)

• Diala V Oil

  • type of oil used in a protective housing of an x-ray tube that contains oil to dissipate heat and act as electric insulator
• Which of the following is not a part of the external component of an x-ray tube? Tube window, Rotor, Support system, or Enclosure

  • Rotor
• Preferred Detent Position

  • x-ray tube is centered above the examination table at standard SID
• Enclosure

  • part of x-ray tube specifically is designed to support the x-ray tube and maintain its vacuum
• Saturation Current

  • refers to the rare occurrence where there are no available thermionic electron to be sent out and developed by the target anode
• Stator

  • part of induction motor seen outside the glass or metal enclosure
• Off-focus radiation

  • electrons that bounce off the focal spot
• Which of the following is found in the positive electrode side in the x-ray? Filament, Focusing cup, Tube window, Focal spot, or NOTA

  • Focal spot
• The filament of the x-ray tube is located in the? Enclosure, Protective housing, Anode side, AOTA, or NOTA

  • NOTA
• Target

  • area of anode material struck by the electron during x-ray production
• It is not a function of the induction motor within an x-ray tube

  • used to induce current for the filament
• Focal track

  • actual source of x-rays within an x-ray tube
• It is not a function of anode

  • peels of the electrons for x-ray production
• Process of thermionic emission causes:

  • electrons to boil off the filament
• 5cm^2

  • size of x-ray tube section where x-rays are emitted
• Tungsten is the main material of choice for target because ____

  • it has high thermal conductivity
• All materials are used for the filament of x-ray tube except: Tungsten, Thorium, Nickel, or Coil of wire

  • Nickel
• Saturation Current

  • when all available electrons have been used and tube current reaches its maximum level
• Molybdenum

  • incorporated to the target to reduce its weight
• 10000 rpm

  • x-ray tube that uses high-capacity x-ray imaging system
• Double focus x-ray tubes has two ____

  • filament
• Diodes

  • x-ray tube
  • anode
• Ceiling support

  • consist of two perpendicular sets of ceiling mounted rails
• Protective housing

  • external component of x-ray tube that contains oil that serves as insulator and thermal cushion
• Projectile electrons

  • electrons from cathode to anode
• Characteristic radiation

  • result when the interaction is sufficiently violent to ionize the target atom through removal of an inner shell electrons
• Metal enclosure

  • prolong tube life and prevent tungsten vaporization
• Tungsten rhenium

  • constitute the anode target
• Grid controlled

  • type of anode more often used in dental imaging
• Thorium

  • presence of this element increases thermionic emission and extends filament life
• Ampere

  • flow of electrons through a circuit and is most commonly described as the amount of charge that flows divided by time
• Magnetic field

  • created by a charged particle in motion
• Watt

  • measure of electrical power
• Insulators

  • rubber
  • glass
• Tesla

  • international standard unit of magnetic field strength
• Ferromagnetic

  • type of material can be made magnetic when placed in an external magnetic field
• Isotope

  • atom has the same number of protons as another, but different number of neutrons
• Faraday's Law

  • magnetic fields can be induced by electric currents
• Coulomb's Law

  • stated that electrostatic force between electric charges has an inverse square relationship with the distance between them
• Magnetic susceptibility

  • degree to which material can be magnetized