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Rad135 Ch5 The X-Ray Tube
Test Description: This content covers chapter 5 (The X-Ray Tube) from the text to help you prepare for the midterm exam in Rad135.
Instructions: Answer all questions to get your test result.
1) Which side of the x-ray tube is negatively charged?
A
cathode
B
stator
C
rotor
D
anode
2) What happens to the filament as vaporization continues?
A
becomes thicker
B
becomes cooler
C
becomes thinner
D
melts
3) What is the shallow depression called which is located in the cathode assembly?
A
focusing cup
B
focal spot
C
dual focus
D
filament
4) Which of the following is NOT a reason for tungsten to be the metal of choice for the anode?
A
heat-conducting capability
B
high melting point
C
greater elasticity
D
high atomic number
5) What is the most common target angle used in diagnostic radiography?
A
10*
B
8*
C
45*
D
12*
6) Which of the following is the only part of the x-ray tube assembly that is outside the vacuum of the glass envelope?
A
rotor
B
stator
C
filament
D
focusing cup
7) Which of the following is the limit to leakage radiation?
A
150 mR/hr at 1m
B
100 mR/hr at 1m
C
100 rad/hr at 1m
D
100mR/min at 1m
8) What type of radiation is made of photons that were not produced at the focal spot?
A
scatter
B
secondary
C
leakage
D
off-focus
9) How many heat units are created by an exposure of 75 kVp, 200 mA, and 0.25 sec on a high-frequency rectified unit?
A
7,375 HU
B
5,250 HU
C
3,255 HU
D
9,375 HU
10) Which of the following extends tube life?
A
utilizing a higher mA station with long exposure times whenever possible
B
activating the high-speed rotor whenever possible
C
rotating the tube housing 90* before the rotor has come to a stop
D
avoid making repeated exposures near the tube loading limits
11) Production of x-rays requires...
A
stationary anode, grid-biased tube, and high mA
B
source of electrons, target, high voltage, vacuum
C
source of electrons, target, low voltage, vacuum
D
rotor, stator, low temperatures
12) The cathode...
A
has a positive charge
B
rotates on a molybdenum base
C
is electromagnetically induced by the stator
D
has a negative charge
13) What does thermionic emission do to free electrons?
A
causes them to be released from the filament
B
hugs them in a warm blanket
C
causes them to be slowed down
D
blocks them
14) What is the minimum temperature a tungsten filament needs to exhibit significant thermionic emission?
A
3000 C
B
1,500 C
C
2,200 C
D
500 C
15) Which is true regarding tube failure?
A
the tungsten filament gets thicker over time from build-up
B
exposing a cold anode could crack it
C
arcing improves image detail
D
vaporized tungsten does not stick to the glass envelope
16) Which is not synonymous with the term target area?
A
actual focal spot
B
effective focal spot
C
focal track
D
focal point
17) According to the anode heel effect...
A
always place the patient's heel on the tube housing during cross-table imaging
B
intensity of the beam is less on the cathode side
C
intensity of the beam is greater on the cathode side
D
you never need 72 in SID when utilizing the anode heel effect
18) Which would NOT affect rotation of the anode target?
A
failure of the silver ball bearings
B
failure of the stator
C
failure of the filament circuit
D
failure of the rotor
19) Which is NOT true of the tube housing?
A
It is lead-lined to control leakage radiation
B
It is recommended to place your hand on the housing during exposure to ensure it is cool enough
C
It is filled with dielectric oil to promote cooling
D
It is grounded to isolate the high voltage
20) Tube rating charts and cooling charts...
A
should be consulted before every exposure
B
are universal for all diagnostic x-ray tubes
C
can give guidance for safe exposure parameters
D
are only for mammography units
*select an answer for all questions
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