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Rad135 Final Exam Review- Part 3
Test Description: This content covers several chapters from the text to help you prepare for the final exam in Rad 135.
Instructions: Answer all questions to get your test result.
1) When an x-ray beam goes through matter, resulting in a reduction in the number of x-ray photons, it undergoes a process called ____.
A
coherent scatter
B
attenuation
C
photoelectric absorption
D
pair production
2) What is the process called when an inner-shell electron interacts with an x-ray photon?
A
photoelectric absorption
B
photodisintegration
C
compton scatter
D
pair production
3) With photoelectric absorption, what is the ejected electron known as?
A
photoelectron
B
k-shell electron
C
characteristic cascade
D
secondary radiation
4) What form of energy is released when an electron drops from an outer shell to an inner shell to fill a vacancy?
A
characteristic photon
B
photoelectron
C
pair production
D
recoil electron
5) In a Compton interaction with an O-shell electron ( binding energy of .03 keV), what was the energy of the incident photon if the result is a 64.97 keV Compton scattered x-ray and a recoil electron with 20 keV?
A
84.97 keV
B
85 keV
C
45 keV
D
44.94 keV
6) Which of the following is the interaction that occurs between very low-energy x-ray photons (10keV) and matter?
A
pair production
B
coherent scatter
C
compton scatter
D
photoelectric effect
7) Which of the following occurs when an incident x-ray photon interacts with a loosely bound outer-shell electron, ejecting the electron from its shell, and then moves in another direction?
A
compton scatter
B
pair production
C
photoelectric effect
D
coherent scatter
8) Which of the following occurs when a scattered photon is deflected back toward the source?
A
backscatter
B
secondary radiation
C
forward scatter
D
off-focus radiation
9) In pair production, what is the electron with a positive charge called?
A
photoelectron
B
negatron
C
ion
D
positron
10) Which of the following is the name for the interaction between an extremely high-energy photon (above 10 MeV) and the nucleus?
A
pair production
B
photodisintegration
C
coherent scatter
D
compton scatter
11) Which of the following best describes the process when an x-ray goes through matter without interaction?
A
scatter
B
attenuation
C
transmission
D
backscatter
12) Which of the following occurs when an inner shell electron interacts with an x-ray photon?
A
compton scatter
B
pair production
C
photoelectric absorption
D
photodisintegration
13) What happens to the transmission of photons when the kilovoltage is increased with no other change in the technical factors for an exposure?
A
transmission is unchanged
B
transmission decreases
C
transmission stops
D
transmission increases
14) Which one of the following radiology exams listed below are considered more complex because of the many added variables outside of the department?
A
mobile radiography
B
fluoroscopy
C
MRI
D
CT
15) Transitioning from conventional fluoroscopy to image intensified fluoroscopy meant going from scotopic vision to _________ vision.
A
photographic
B
retinal
C
rods and cones
D
photopic (daylight)
16) A common device used to measure a display monitors quality and characteristics is a/an ____.
A
AAPM TG 18
B
screen contact test tool
C
SMPTE pattern
D
ABC resolution phantom
17) All of the following are true of the fluoroscopic lead apron drape except ____.
A
it should be 0.25 mm Pb equivalent
B
it may be detached for specific reasons
C
it covers the Bucky slot in the table
D
it is designed to absorb most of the patient scatter
18) Almost all of the kinetic energy of an incident electrons is converted to ____.
A
photoelectron
B
heat
C
electromagnetism
D
light
19) As more and more electrons build up in the area of the filament, their negative charges oppose the emission of additional electrons. This phenomenon is known as ____.
A
space charge effect
B
thermionic emission
C
current saturation
D
biased cloud formation
20) Flux gain ____.
A
improves image resolution due to the small penumbra created by the output phosphor crystals
B
is directly related to the input phosphor conversion efficiency
C
deals with the light intensity gain resulting from the acceleration of electrons inside the image intensification tube
D
increases with the number of electrostatic lenses present
*select an answer for all questions
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