Rad135 Final Exam Review- Part 3 Question Preview (ID: 56142)
This Content Covers Several Chapters From The Text To Help You Prepare For The Final Exam In Rad 135.
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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) attenuation
b) coherent scatter
c) pair production
d) photoelectric absorption
What is the process called when an inner-shell electron interacts with an x-ray photon?
a) compton scatter
b) pair production
c) photoelectric absorption
d) photodisintegration
With photoelectric absorption, what is the ejected electron known as?
a) photoelectron
b) characteristic cascade
c) secondary radiation
d) k-shell electron
What form of energy is released when an electron drops from an outer shell to an inner shell to fill a vacancy?
a) pair production
b) recoil electron
c) characteristic photon
d) photoelectron
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) 45 keV
b) 84.97 keV
c) 44.94 keV
d) 85 keV
Which of the following is the interaction that occurs between very low-energy x-ray photons (10keV) and matter?
a) pair production
b) compton scatter
c) coherent scatter
d) photoelectric effect
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) pair production
b) compton scatter
c) coherent scatter
d) photoelectric effect
Which of the following occurs when a scattered photon is deflected back toward the source?
a) secondary radiation
b) off-focus radiation
c) backscatter
d) forward scatter
In pair production, what is the electron with a positive charge called?
a) photoelectron
b) positron
c) negatron
d) ion
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) compton scatter
c) coherent scatter
d) photodisintegration
Which of the following best describes the process when an x-ray goes through matter without interaction?
a) attenuation
b) scatter
c) transmission
d) backscatter
Which of the following occurs when an inner shell electron interacts with an x-ray photon?
a) photodisintegration
b) photoelectric absorption
c) pair production
d) compton scatter
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 stops
b) transmission is unchanged
c) transmission decreases
d) transmission increases
Which one of the following radiology exams listed below are considered more complex because of the many added variables outside of the department?
a) CT
b) MRI
c) mobile radiography
d) fluoroscopy
Transitioning from conventional fluoroscopy to image intensified fluoroscopy meant going from scotopic vision to _________ vision.
a) retinal
b) rods and cones
c) photopic (daylight)
d) photographic
A common device used to measure a display monitors quality and characteristics is a/an ____.
a) screen contact test tool
b) SMPTE pattern
c) AAPM TG 18
d) ABC resolution phantom
All of the following are true of the fluoroscopic lead apron drape except ____.
a) it should be 0.25 mm Pb equivalent
b) it is designed to absorb most of the patient scatter
c) it covers the Bucky slot in the table
d) it may be detached for specific reasons
Almost all of the kinetic energy of an incident electrons is converted to ____.
a) heat
b) light
c) photoelectron
d) electromagnetism
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) thermionic emission
b) biased cloud formation
c) space charge effect
d) current saturation
Flux gain ____.
a) improves image resolution due to the small penumbra created by the output phosphor crystals
b) deals with the light intensity gain resulting from the acceleration of electrons inside the image intensification tube
c) is directly related to the input phosphor conversion efficiency
d) increases with the number of electrostatic lenses present
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