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Rad135 Final Exam Review- Part 2
Test Description: This content covers several chapters from the text to help you prepare for the final exam in Rad135.
Instructions: Answer all questions to get your test result.
1) The single function of an AEC is to eliminate the need to set
A
mA
B
kVp
C
time
D
mAs
2) When an AEC is used for an AP hip, which ionization chambers are utilized?
A
none
B
left and right cells only
C
center cell
D
all three cells
3) U.S. public law requires that generators automatically terminate AEC exposures at ____ mAs above 50 kVp
A
600
B
200
C
500
D
300
4) The backup time of most AECs is set at ____ of the anticipated manual exposure time.
A
150%
B
10%
C
50%
D
100%
5) As you are performing a KUB radiograph on a patient using AEC, you notice that your post-exposure readout is unusually high. A possible explanation for this high reading could be
A
a detector was collimated out of the field of exposure
B
minimum response time was set too long
C
kVp was set too high
D
backup timer was set too low
6) What percentage of target interaction results in the production of x-ray photons?
A
90%
B
99%
C
1%
D
50%
7) Characteristic interactions may occur only when the incident electron interacts with
A
outer-shell electron
B
inner-shell electron
C
atom's valence band
D
force field of the nucleus
8) The energy of a characteristic photon is
A
equal to the binding energy of the exiting electron.
B
equal to the binding energy of the entering electron.
C
the sum of the binding energy of the outer and inner shells between which the electron dropped.
D
the difference between the binding energy of the outer and inner shells between which the electron dropped.
9) When comparing the x-ray emission spectrum between beams produced at 70 kVp and 110 kVp,
A
the 70 kVp beam would demonstrate less brems and a higher characteristic spike.
B
the 110 kVp beam would demonstrate more brems and a higher characteristic spike.
C
the 70 kVp beam would demonstrate an equal amount of brems and characteristic radiation.
D
the 110 kVp beam would demonstrate less brems and a higher characteristic spike.
10) Tungsten is the anode material of choice for x-ray production because of its
A
excellent k-edge value for x-ray production
B
creation of off-focus radiation
C
ability to expand with high speed rotation G-forces
D
ability of liberating electrons as secondary x-ray sources
11) What percentage of the primary beam is formed by brems radiation when the kilovoltage (kVp) is 80-100?
A
20-30%
B
80-90%
C
0-10%
D
50-60%
12) What minimum kilovoltage is necessary for the production of characteristic photons in a diagnostic x-ray tube?
A
50 kVp
B
70 kVp
C
60 kVp
D
40 kVp
13) What is the recommended minimum total filtration for kilvoltage above 70?
A
0.5 mm Al
B
3.5 mm Al
C
1.5 mm Al
D
2.5 mm Al
14) What unit is used to measure x-ray tube current?
A
mAs
B
milliamps
C
air kerma
D
kVp
15) What happens to the number of electrons that cross the tube when the mA doubles?
A
is cut in half due to the conservation of energy
B
depends on the kVp setting
C
doubles
D
quadruples due to the inverse square law
16) Which of the following influences both the quality and the quantity of the x-ray beam?
A
seconds
B
kVp
C
mAs
D
distance
17) What new kilovoltage would double the exposure (density) of a tibia taken at 6 mAs at 70 kVp?
A
60
B
140
C
75
D
80.5
18) When kVp decreases, what happens to the number of photoelectric interactions?
A
interactions increase
B
interactions stop
C
interactions decrease
D
no change
19) At the end of the characteristic cascade, the ____ shell is the last shell to fill with a free electron.
A
outermost
B
q-shell
C
k-shell
D
innermost
20) Bremsstrahlung interactions may occur only when the incident electron interacts with ____.
A
an inner shell electron
B
an outer shell electron
C
the force field around the nucleus
D
the nucleus directly
*select an answer for all questions
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