cAPTER 6.... X RAY TUBE

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Author:
MYKE
ID:
240128
Filename:
cAPTER 6.... X RAY TUBE
Updated:
2013-10-11 23:16:29
Tags:
STUDY
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Description:
KATS TEST MONDAY
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  1. cathode and the anode. Each of these is an electrode, and any electronic tube with two electrodes is called
    a diode
  2. When x-rays are produced, they are emitted isotropically, that means....___
    with equal intensity in all directions.
  3. The x-rays emitted through the window are called the
    useful beam.
  4. X-rays that escape through the protective housing are called
    leakage radiation
  5. The cathode is the__1___ side of the x-ray tube; it has two primary parts, a ___2__ and a __3___.
    • 1 negative
    • 2 filament
    • 3 focusing cup
  6. When the current through the filament is sufficiently high, the outer-shell electrons of the filament atoms are ‘boiled off’ and ejected from the filament. This phenomenon is known as -_____
    thermionic emission.
  7. Filaments are usually made of
    thoriated tungsten
  8. The filament is embedded in a metal shroud called the_____
    focusing cup
  9. Filament current that has risen to its maximum value because all available electrons have been used IS CALLED
    Saturation current
  10. The anode is the_____ side of the x-ray tube.
    positive
  11. There are two types of anodes,_____  and ______
    • stationary
    • rotating
  12. The anode serves three functions in an x-ray tube
    • electrical conductor
    •  mechanical support  
    • thermal dissipater.
  13. The target is
    the area of the anode struck by the electrons from the cathode.
  14. Tungsten is the material of choice for the target for general radiography for three main reasons:
    • Atomic number
    • Thermal conductivity
    • High melting point
  15. the area of the target from which x-rays are emitted.
    The focal spot
  16. The intensity of x-rays that are emitted through the ‘heel’ of the target is reduced because they have a longer path through the target and therefore increased absorption. This is CALLED
    the heel effect.
  17. some of the electrons bounce off the focal spot and then land on other areas of the target, causing x-rays to be produced from outside of the focal spot THIS IS CALLED
    off-focus radiation.

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