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RADT 450 Exam Questions and Answers (Graded A)
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RADT 450 Exam Questions and Answers
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RADT 450 Exam Questions and Answersin the diagnostic range, the kinetic energy of the incident electrons is high enough to eject
an outer shell electron causing ionization
a. true
b. false - Answer -a. true
in a bremsstrahlung interaction, the closer the incident electron travels to the nucleus, the
lower the energy of the resultant x-ray photon
a. true
b. false - Answer -b. false
the creation of a characteristic photon is always the result of a k-shell electron ejection
a. true
b. false - Answer -b. false
filament saturation occurs when the negative charge of the electron cloud opposes the
emission of additional electrons from the filament
a. true
b. false - Answer -b. false
like the cathode, the anode comprises a single metal called tungsten
a. true
b. false - Answer -b. false
the line-focus principle is used to reduce the actual area of the focal spot
a. true
b. false - Answer -b. false
the anode target increases, the primary beam field size increases
a. true
b. false - Answer -a. true
according to the anode heel effect, the radiation intensity is greater on the anode side
a. true
b. false - Answer -b. false
If the distance from the source to the image (SID) is reduced by half, how is the x-ray
intensity at the image affected
a. it is doubled
,b. it is reduced by 1/2
c. it is increased 4 times
d. it is reduced by 1/4 - Answer -c. it is increased 4 times
if a technologist changes the technique from 70 kVp @ 200 mAs to 70 kVp @ 400 mAs, the
the x-ray intensity will ---- and optical density will ----
a. remain the same; remain the same
b. remain the same; double
c. double; remain the same
d. double; double - Answer -d. double; double
the inverse square law has the same effect on optical density and x-ray
a. quantity
b. intensity
c. exposure
d. all of the above - Answer -d. all of the above
An increase of 15% in kVp is equivalent to increasing mAs ----
a. 50%
b. 100%
c. 30%
d. 15% - Answer -b. 100%
if an exposure is 50mR at an SID of 40 inches, what would the exposure be at an SID of 60
inches
a. 75mR
b. 112.5mR
c. 33.3mR
d. 22.2mR - Answer -d. 22.2mR --> (50(40^2))/60^2
beam quality is affected by
a. mAs and distance
b. filtration and mAs
c. kVp and mAs
d. kVp and filtration - Answer -d. kVp and filtration
the half value layer (HVL) of an x-ray beam is a measurement of beam ----
a. intensity
b. quantity
c. quality
d. all of the above - Answer -c. quality
The energy of a bremsstrahlung photon is
a. the difference between the entering and exiting kinetic energy of the electron
b. equal to the kinetic energy of the exiting electron
c. the sum of the entering and exiting kinetic energy of the electron
, d. equal to the kinetic energy of the entering electron - Answer -a. the difference between
the entering and exiting kinetic energy of the incoming electron
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 of the nucleus
d. none of the above - Answer -c. the force field of the nucleus
At the end of the characteristic cascade, the ____ shell is missing an electron
a. innermost
b. outermost
c. characteristic
d. k - Answer -b. outermost
the k-shell can hole a maximum of ---- electrons
a. 6
b. 2
c. 1
d. 8 - Answer -b. 2
Most of the heat generated at the target is due to _____.
a. nucleus bombardment
d. inner shell ionization
c. k x-rays
d. outer shell excitation - Answer -d. outer shell excitation
the production of heat at the anode is directly proportional to
a. kVp
b. filament current
c, rotor speed
d. tube current - Answer -d. tube current
The useful characteristic x-rays from tungsten targets are ---- x-rays.
a. N-shell
b. L-shell
c. K-shell
d. M-shell - Answer -c. K-shell
At 55 kVp, _____ of the x-rays produced are bremsstrahlung.
a. 100%
b. 15%
c. 80%
d. none - Answer -a. 100%
characteristic x-rays are produced by
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