X-ray Tube Test

question

The target of an x-ray tube is made of what metal?
answer

Tungsten
question

Why is an x-ray tube immersed in oil?
answer

Insulation
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What causes most x-ray failures?
answer

excessive heat
question

What types of primary radiation is produced when the x-ray tube boltage is below 70?
answer

Bremsstrahlung
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What type of motor drives the rotating anode?
answer

Induction
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Which part of the x-ray tube has the filament wires and focusing cup?
answer

Cathode
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As kilovoltage is applied, the electrons are accelerated toward which part of the x-ray tube?
answer

Anode
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Which kVp and mAs combination produce the least load on an x-ray tube?
answer

High kVp, low mAs
question

What is required of a metal target in an x-ray tube?
answer

1)Ability to conduct heat 2) High atomic number 3)High melting point
question

What increases the penetrating power of the x-ray tube?
answer

Kilovoltage
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What is the area of the x-ray target called that is struck by electrons?
answer

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?
answer

Heat
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What is the negative terminal x-ray tube?
answer

Cathode
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What are the x-ray tubes called that have 2 filament wires?
answer

Dual focus tubes
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How many kilovolts is equal to 75,000 volts?
answer

75kV
question

The formula, mA x kVp x time(s) is for what?
answer

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?
answer

Pitting
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What is used to focus the electron stream toward the target of the anode?
answer

Focusing cup
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Electrons travel in an x-ray tube from ___ to ___.
answer

Cathode, Anode
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Which of the following is filtration that is manufactured into the x-ray tube?
answer

Inherent Filtration
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What determines the quantity of electrons that will be accelerated across the x-ray tube?
answer

Heating of the filament
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During thermoniac emission a cloud of electrons surround the filament. What is the electron cloud called?
answer

Space charge
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If used properly, will an x-ray tube last forever?
answer

No, the filament wire will break
question

How fast do high speed anodes rotate?
answer

10,000RPM
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What causes the pitting of the x-ray tube target?
answer

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.
answer

Smaller
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As the x-ray tube gets older, what happens to the temperature of the filament?
answer

Increases
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What would NOT be found on the control panel?
answer

Rotor button
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As electrons are accelerated across the x-ray tube, they are referred to as what?
answer

Tube current
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What is the purpose of the anode in an x-ray tube?
answer

Decelerates electrons
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What is the purpose of a window in an x-ray tube?
answer

For the emmision of x-rays
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What effect will increasing the kVp have on the production of x-rays?
answer

Their energy will increase
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When will a space charge be present in the x-ray tube?
answer

Whenever the rotor engaged
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What is NOT needed to produce x-rays?
answer

Rotating anode
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What is the definition of off focus radiation?
answer

Photons that are not produced at the focal spot
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Why is an x-ray tube made of Pyrex glass?
answer

To better withstand heat
question

When electrons strike the anode of an x-ray tube, how much of their energy is converted to x-rays?
answer

Less than 1%
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Which parts make up the cathode end of the x-ray tube?
answer

Filament and focusing cup
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In a modern, rotating anode x-ray tube, what coats the tungsten disk?
answer

Tungsten rhenium alloy
question

During an exposure, what electrical charge is placed on the anode?
answer

Positive
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What is the process of “boiling off” electrons called?
answer

Thermionic Emission
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The filament wires in radiographic tubes are made from what metal?
answer

Tungsten
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Which is not related to the other? -Rotor -Target -Filament -Tungsten Disk
answer

Filament
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In what unit is filament current measured?
answer

Amperage
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Which is the smallest? -Space charge -Actual focal spot -Effective focal spot -Target
answer

Effective Focal Spot
question

Why is that x-ray tube encased in a lead housing?
answer

Prevent leakage radiation

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