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RAD121 Test

Enter the letter for the matching Answer
incorrect
1.
Target
incorrect
2.
Anode
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3.
What is filament thickness?
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4.
Which anodes have a greater heat-loading capacity?
incorrect
5.
Focal Spot
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6.
mA controls what?
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7.
Leakage Radiation
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8.
What is the advantage of a high-speed rotor?
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9.
Rotor
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10.
isotropically
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11.
Rotating Anode
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12.
Saturation Current
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13.
What are the basic parts of a cathode assembly?
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14.
Molybdenum's atomic number
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15.
What is the purpose of the filament?
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16.
Stator
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17.
Define leakage radiation.
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18.
Pitting of the focal track is caused by what?
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19.
What is the primary function of the envelope?
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20.
What is the point source of x-ray photons in addition to being the point that OID and SID are measured from?
A.
the target
B.
.1-.2
C.
The # of electrons available.
D.
An anode assembly that turns during exposure
E.
Mutual-induction-motor electromagnets that turn the anode
F.
high-speed anodes
G.
filament/s, focusing cup, associated wiring
H.
Faster anode rotation promotes better heat dissipation.
I.
Any photon that escapes from the housing except at the port.
J.
To provide sufficient resistance to the flow of electrons so that the heat produced will cause thermionic emission to occur.
K.
The portion of the anode where the high-voltage electron stream will impact; also: target, focus, focal point, actual focal spot
L.
42
M.
vaporization of focal track material; reduces efficiency
N.
To maintain the vacuum.
O.
The portion of the anode where the high-voltage electron stream will impact; also: target, focus, focal spot, actual focal spot
P.
Filament phenomenon; as kVp increases, a greater percentage of the thermionically emitted electrons are driven toward the anode and is reached when there are no further thermionic electrons to be driven toward the anode; effects efficiency
Q.
Any photons that escape from the housing except at the port
R.
The positive side of the x-ray tube; serves as a target surface for high-voltage electrons from the filament, conducts the high voltage from the cathode back into the x-ray generator circuitry, and serves as the primary thermal conductor.
S.
A hollow copper cylinder or cuff that is attached to the anode disk by a molybdenum shaft
T.
in all directions
Type the Answer that corresponds to the displayed Question.
incorrect
21.
What is filament length?
incorrect
22.
What is filament width?
incorrect
23.
What is the target angle range for x-ray tubes?
incorrect
24.
Where are high speed incident electrons from the filament suddenly stopped?
Type the Question that corresponds to the displayed Answer.
incorrect
25.
A structure where the primary x-ray beams exit the envelope, which allows for less absorption of scatter radiation
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26.
A type of tube that quickly regulates the flow of electrons, producing x-ray photons; also: grid-controlled, grid-biased
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27.
The portion of the anode where the high-voltage electron stream will impact; when discussing a rotating anode this describes the circular path that will be impacted by the electron beam
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28.
A very small focal spot; usually a fraction of a millimeter in size
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29.
Permits the calculation of the time necessary for the housing to cool enough for additional exposures to be made
incorrect
30.
The entire cathode and anode assembly is housed within this metal structure

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