What's Tubin, Good Lookin'?
This negative side of the x-ray tube houses the filament and the focusing cup.
What is the cathode?
This percentage represents how much of the total kinetic energy of electrons inside the tube is actually converted into x-rays, with the rest becoming heat.
What is 1%? (and 99% heat?)
Almost all tube failure is related to this.
What is heat?
This phenomenon causes the x-ray beam to be more intense on the cathode side of the tube than on the anode side.
This is the most common type of x-ray tube support and uses two sets of rails to allow both longitudinal and transverse movement.
What is a ceiling support?
This process boils free electrons off the tungsten filament when heated.
What is thermionic emission?
A dental XR tube would most likely use this type of anode.
This common type of anode damage results from extended use, causing localized surface melting and roughness.
What is pitting (cracking) of the anode?
The tube structure that serves as the source of electrons.
What is the filament?
No glass panes or curtains here—this is the thin area of the tube envelope through which the useful x-ray beam exits.
What is the window?
This phenomenon occurs when a cloud of electrons builds up near the filament, holding back the emission of additional electrons.
What is the space charge effect?
This type of x-ray production happens most frequently at the target, occurring when a high-speed electron is slowed down or deflected by the nucleus.
What is Bremsstrahlung radiation?
The 3 methods of heat dissipation within the XR tube.
What is radiation, convection, and conduction?
At 100 kVp, this percentage of the beam will be characteristic radiation.
What is 15%?
Unlike the modern Coolidge tube, this early “cold cathode” tube was only partially evacuated and relied on the ionization of gas to produce x-rays.
What is the Crooke's tube?
This material is added to the target to withstand high rotation speeds, as well as adds resilience to the expansion and contraction involved with heating the anode.
This specific type of x-ray interaction and production requires a minimum threshold of 69.5 kVp to knock out an inner-shell electron.
What is characteristic radiation?
This primary cause of filament failure happens over time as tungsten atoms are boiled off and deposited on the inner glass envelope.
What is vaporization?
This allows for a larger surface for electron-target interaction, while maintaining a small effective focal spot (which preserves detail).
What is the line focus principle?
Leakage radiation from the protective housing must remain below this amount when measured at 1 meter.
What is less than 1 mGyₐ/hr at 1 meter?
Tungsten is the metal of choice for the target because of its high melting point and this high atomic property.
What is a high atomic number?
The actual point of x-ray production.
What is the focal spot?
To further enhance thermionic emission, and prolong tube life, this element is added to the filament.
What is thorium?
The chart that helps to convey safe and unsafe techniques to help prolong tube life.
What is a radiographic rating chart?
Name all four requirements necessary for x-ray production.
What are a vacuum, source of electrons, acceleration of electrons, and deceleration of electrons?