X-ray Tube Test
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The target of an x-ray tube is made of what metal?
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Tungsten
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Why is an x-ray tube immersed in oil?
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Insulation
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What causes most x-ray failures?
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excessive heat
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What types of primary radiation is produced when the x-ray tube boltage is below 70?
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Bremsstrahlung
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What type of motor drives the rotating anode?
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Induction
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Which part of the x-ray tube has the filament wires and focusing cup?
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Cathode
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As kilovoltage is applied, the electrons are accelerated toward which part of the x-ray tube?
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Anode
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Which kVp and mAs combination produce the least load on an x-ray tube?
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High kVp, low mAs
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What is required of a metal target in an x-ray tube?
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1)Ability to conduct heat 2) High atomic number 3)High melting point
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What increases the penetrating power of the x-ray tube?
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Kilovoltage
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What is the area of the x-ray target called that is struck by electrons?
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Actual focal spot
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When electrons strike the target of an x-ray tube, most of their energy is converted to what?
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Heat
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What is the negative terminal x-ray tube?
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Cathode
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What are the x-ray tubes called that have 2 filament wires?
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Dual focus tubes
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How many kilovolts is equal to 75,000 volts?
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75kV
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The formula, mA x kVp x time(s) is for what?
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Finding heat units
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The small craters in the target of a used anode of an x-ray tube are known as what?
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Pitting
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What is used to focus the electron stream toward the target of the anode?
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Focusing cup
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Electrons travel in an x-ray tube from ___ to ___.
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Cathode, Anode
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Which of the following is filtration that is manufactured into the x-ray tube?
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Inherent Filtration
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What determines the quantity of electrons that will be accelerated across the x-ray tube?
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Heating of the filament
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During thermoniac emission a cloud of electrons surround the filament. What is the electron cloud called?
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Space charge
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If used properly, will an x-ray tube last forever?
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No, the filament wire will break
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How fast do high speed anodes rotate?
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10,000RPM
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What causes the pitting of the x-ray tube target?
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Moderate overloading of the tube
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According to the line focus principle, the effective focal spot is ___ than the actual focal spot.
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Smaller
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As the x-ray tube gets older, what happens to the temperature of the filament?
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Increases
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What would NOT be found on the control panel?
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Rotor button
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As electrons are accelerated across the x-ray tube, they are referred to as what?
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Tube current
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What is the purpose of the anode in an x-ray tube?
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Decelerates electrons
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What is the purpose of a window in an x-ray tube?
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For the emmision of x-rays
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What effect will increasing the kVp have on the production of x-rays?
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Their energy will increase
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When will a space charge be present in the x-ray tube?
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Whenever the rotor engaged
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What is NOT needed to produce x-rays?
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Rotating anode
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What is the definition of off focus radiation?
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Photons that are not produced at the focal spot
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Why is an x-ray tube made of Pyrex glass?
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To better withstand heat
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When electrons strike the anode of an x-ray tube, how much of their energy is converted to x-rays?
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Less than 1%
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Which parts make up the cathode end of the x-ray tube?
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Filament and focusing cup
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In a modern, rotating anode x-ray tube, what coats the tungsten disk?
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Tungsten rhenium alloy
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During an exposure, what electrical charge is placed on the anode?
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Positive
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What is the process of "boiling off" electrons called?
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Thermionic Emission
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The filament wires in radiographic tubes are made from what metal?
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Tungsten
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Which is not related to the other? -Rotor -Target -Filament -Tungsten Disk
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Filament
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In what unit is filament current measured?
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Amperage
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Which is the smallest? -Space charge -Actual focal spot -Effective focal spot -Target
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Effective Focal Spot
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Why is that x-ray tube encased in a lead housing?
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Prevent leakage radiation
