Rad135 Final Exam Review- Part 2 Question Preview (ID: 56141)


This Content Covers Several Chapters From The Text To Help You Prepare For The Final Exam In Rad135. TEACHERS: click here for quick copy question ID numbers.

Which of the following influences both the quality and the quantity of the x-ray beam?
a) mAs
b) kVp
c) seconds
d) distance

What happens to the number of electrons that cross the tube when the mA doubles?
a) quadruples due to the inverse square law
b) is cut in half due to the conservation of energy
c) doubles
d) depends on the kVp setting

What unit is used to measure x-ray tube current?
a) mAs
b) kVp
c) milliamps
d) air kerma

What minimum kilovoltage is necessary for the production of characteristic photons in a diagnostic x-ray tube?
a) 40 kVp
b) 50 kVp
c) 60 kVp
d) 70 kVp

What is the recommended minimum total filtration for kilvoltage above 70?
a) 0.5 mm Al
b) 1.5 mm Al
c) 2.5 mm Al
d) 3.5 mm Al

What percentage of the primary beam is formed by brems radiation when the kilovoltage (kVp) is 80-100?
a) 0-10%
b) 20-30%
c) 50-60%
d) 80-90%

Tungsten is the anode material of choice for x-ray production because of its
a) ability to expand with high speed rotation G-forces
b) ability of liberating electrons as secondary x-ray sources
c) creation of off-focus radiation
d) excellent k-edge value for x-ray production

When comparing the x-ray emission spectrum between beams produced at 70 kVp and 110 kVp,
a) the 110 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 less brems and a higher characteristic spike.
d) the 70 kVp beam would demonstrate an equal amount of brems and characteristic radiation.

The energy of a characteristic photon is
a) equal to the binding energy of the entering electron.
b) equal to the binding energy of the exiting 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.

Characteristic interactions may occur only when the incident electron interacts with
a) outer-shell electron
b) inner-shell electron
c) force field of the nucleus
d) atom's valence band

What percentage of target interaction results in the production of x-ray photons?
a) 1%
b) 50%
c) 90%
d) 99%

The backup time of most AECs is set at ____ of the anticipated manual exposure time.
a) 10%
b) 50%
c) 100%
d) 150%

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) kVp was set too high
b) backup timer was set too low
c) a detector was collimated out of the field of exposure
d) minimum response time was set too long

U.S. public law requires that generators automatically terminate AEC exposures at ____ mAs above 50 kVp
a) 200
b) 300
c) 500
d) 600

The single function of an AEC is to eliminate the need to set
a) kVp
b) mA
c) mAs
d) time

When an AEC is used for an AP hip, which ionization chambers are utilized?
a) center cell
b) left and right cells only
c) all three cells
d) none

What new kilovoltage would double the exposure (density) of a tibia taken at 6 mAs at 70 kVp?
a) 60
b) 75
c) 80.5
d) 140

When kVp decreases, what happens to the number of photoelectric interactions?
a) interactions stop
b) interactions decrease
c) interactions increase
d) no change

At the end of the characteristic cascade, the ____ shell is the last shell to fill with a free electron.
a) k-shell
b) innermost
c) outermost
d) q-shell

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

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