RT 52A Physics quiz 2

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JeremeA
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176158
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RT 52A Physics quiz 2
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2012-10-08 00:03:03
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RT 52A Physics quiz
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RT 52A Physics quiz 2
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  1. Name the 3 types of X-ray Tube support?
    • 1.) Ceiling support
    • 2.) Floor support
    • 3.) C-arm
  2. What is protective housing?
    • 1.) Provides mechanical support
    • 2.) Protects the tube from damage
    • 3.) Reduces the level of leakage radiation
    • a.) Leakage radiation ( x-rays that escape through the protective housing)
    • b.) housing must be lined with lead
    • c.) must reduce leakage radiation to less than 100mR (miloroentgen)/hr at one meter
  3. What are collimators?
    • 1.) 2 sets of lead shutters that retrict size and shape of the x-ray beam
    • 2.) a light field with cross-hairs is provided by a mirror at a 45 degree angle & a light bulb
  4. List the internal components of the x-ray tube?
    • 1.) glass enclosure
    • 2.) cathode assembly
    • 3.) filament
    • 4.) focusing cup
    • 5.) window
    • 6.) target
    • 7.) anode assembly
    • 8.) rotating anode
    • 9.) rotor
  5. Glass enclosures positives and negatives
    • Positives:
    • 1.) made of Pyrex
    • a.) withstands high heat
    • b.) air removed from tube to form a vacuum

    • 2.) results in more efficient x-rays
    • 3.) prevents collision w/gas molecules
    • 4.) prevents oxidation

    Negatives:

    • 1.) Tungsten plating; filament vaporizes in time and adheres to walls
    • 2.) causes arching; bright discharge of light when the current jumps the gap between cathode and anode
  6. What are the positives of metal enclosures?
    • 1.) longer life than glass enclosures
    • 2.) less likely to fail; doesnt allow tungsten to adhere to walls of enclosure
    • 3.) most tubes today are metal enclosures
  7. Area of the enclosure that emits the useful beam?
    1.) Tube Window

    Useful beam- x-rays that exit through the tube window
  8. Cathode/Filament

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