Bushong Chapter 6 Exam Questions with Correct Answers Already Passed
Ceiling Support System - Answers Most frequently used, two perpendicular sets of ceiling-mounted rails
Floor-to-Ceiling Support System - Answers Has a single column with rollers at each end, one attached to
a ceiling-mounted rail and the other attached to a floor-mounted rail
C-arm Support System - Answers Ceiling mounted and provide for very flexible x-ray tube positioning
Isotropic - Answers X-rays emitted with equal intensity in all directions
Useful Beam - Answers X-rays emitted through the window
Leakage Radiation - Answers X-rays that escape through the protective housing
Protective Housing - Answers Protects against accidental electric shock, provides mechanical support,
and protects the tube from damage caused by rough handling
Metal Enclosure Tubes - Answers Maintain a constant electric potential between the electrons of the
tube current and the enclosure
Have a longer life and are less likely to fail
Cathode - Answers Negative side of the x-ray tube
Two primary parts to the cathode - Answers Filament and focusing cup
Filament - Answers A coil of wire similar to that in a kitchen toaster.
Emits electrons when it is heated
Thermionic Emission - Answers 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
Thoriated Tungsten - Answers Makes the filament
Provides for higher thermionic emission
Does not vaporize easily
3410°C - Answers Melting point of thoriated tungsten
Focusing Cup - Answers Metal shroud that surrounds the filament
Effectiveness determined by size and shape, charge, filament size and shape, and the position of the
filament
Space Charge - Answers Cloud of electrons near the filament
Ceiling Support System - Answers Most frequently used, two perpendicular sets of ceiling-mounted rails
Floor-to-Ceiling Support System - Answers Has a single column with rollers at each end, one attached to
a ceiling-mounted rail and the other attached to a floor-mounted rail
C-arm Support System - Answers Ceiling mounted and provide for very flexible x-ray tube positioning
Isotropic - Answers X-rays emitted with equal intensity in all directions
Useful Beam - Answers X-rays emitted through the window
Leakage Radiation - Answers X-rays that escape through the protective housing
Protective Housing - Answers Protects against accidental electric shock, provides mechanical support,
and protects the tube from damage caused by rough handling
Metal Enclosure Tubes - Answers Maintain a constant electric potential between the electrons of the
tube current and the enclosure
Have a longer life and are less likely to fail
Cathode - Answers Negative side of the x-ray tube
Two primary parts to the cathode - Answers Filament and focusing cup
Filament - Answers A coil of wire similar to that in a kitchen toaster.
Emits electrons when it is heated
Thermionic Emission - Answers 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
Thoriated Tungsten - Answers Makes the filament
Provides for higher thermionic emission
Does not vaporize easily
3410°C - Answers Melting point of thoriated tungsten
Focusing Cup - Answers Metal shroud that surrounds the filament
Effectiveness determined by size and shape, charge, filament size and shape, and the position of the
filament
Space Charge - Answers Cloud of electrons near the filament
