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RSCI 210 Exam II Questions And Answers Latest Update
- Course
- RSCI 210
- Institution
- University Of Southern California
RSCI 210 Exam II Questions And Answers Latest Update
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lOMoARcPSD|22014731RSCI 210 Exam II
Attenuation - correct answers Reduction in the number of x-ray photons in the beam
When x-ray photons pass through matter - correct answers When does attenuation take place?
Whole atom, orbital electrons, or directly with nucleus - correct answers What can attenuation interact with?
Photoelectric Absorption, Coherent Scattering, Compton Scattering, Pair Production, Photodisintegration - correct answers What are the 5 basic interactions between photons and matter?
Photoelectric Absorption, Coherent Scattering, Compton Scattering - correct answers Which of the 5 basic interactions will be present in diagnostic radiography?
Pair Production, Photodisintegration - correct answers Which of the 5 basic interactions will NOT be present in diagnostic
radiography?
Photoelectric Absorption - correct answers Happens when x-ray photons interact with an inner-shell electron, and the incident photon ejects the electron from its inner shell.
Ionization - correct answers Photoelectric absorption causes ______________ of an atom.
Photoelectron - correct answers An ejected electron from photoelectric absorption is called a _______________________.
1-2 mm - correct answers Photoelectrons are usually absorbed within how much soft tissue?
Photoelectric Absorption - correct answers Which interaction causes the most significant biological changes?
Outer shell electrons - correct answers In photoelectric absorption, _______________ ____________ _____________ move to inner shell to replace ejected electrons.
Photoelectric Absorption - correct answers Which interaction involves the characteristic cascade?
Incident x-ray photon energy must be greater than the binding energy of the inner shell electron, x-ray photon energy and electron energy are close to one another, and the electron should be more tightly bound in its orbit - correct answers What are the 3 rules for photoelectric absorption?
Coherent scattering - correct answers Which interaction occurs between very low energy x-ray photons and matter?
Classical or unmodified scatter - correct answers What are the other names for coherent scattering?
Thomson scattering and Rayleigh scattering - correct answers What are the two types of classical or coherent scattering?
A single electron in the interaction - correct answers Thomson scattering involves...?
All of the electrons of the atom - correct answers Rayleigh scattering involves...?
True - correct answers True or false: Thomson and Rayleigh scattering both produce the same results.
Low energy - correct answers In coherent scattering, a _____ _________ x-ray photon hits an electron (or multiple electrons).
Vibrates - correct answers In coherent scattering, the electron(s) hit by the x-ray photon _________________ at the same frequency as the photon. lOMoARcPSD|22014731
Excess energy - correct answers In coherent scattering, the excited atom releases ___________ ___________ in the form of a secondary photon.
It has the same energy, frequency, and wavelength, but it is traveling in a different direction. - correct answers In coherent
scattering, how does the secondary photon behave in comparison to the initial photon?
Coherent scattering - correct answers Because of its low energy, which type of interaction is of very little significance to diagnostic imaging?
Compton scattering - correct answers Occurs when an incident x-ray photon interacts with a loosely bound outer shell electron
Compton effect, compton/recoil electron - correct answers What is the process called when the interaction removes the electron from its shell, and them proceeds in a different direction? What is the dislodged electron known as?
Compton scattered photon - correct answers In compton scattering, there photon that exits the atom in a different direction
is called a _____________ ______________ ______________.
Backscatter radiation - correct answers In compton scattering, what is it called when the scattered photon is ejected back toward the source?
Occupational exposure - correct answers Compton scattering causes impaired image quality, and is the primary cause of what?
Radiation fog - correct answers The unwanted exposures the the image receptor.
Pair Production - correct answers Interaction where the energy is concerted to matter in the form of two electrons, and a very high energy photon is required.
Pair Production, Photodisintegration - correct answers Radiation therapy involves what type(s) of interaction(s)?
Negatrons and positrons - correct answers In pair production, what are the electrons referred to?
Negatron - correct answers In pair production, which electron is absorbed almost as soon as it is created?
Positron - correct answers In pair production, which electron combines with another electron, disappears, and creates two photons moving in opposite directions?
Photodisintegration - correct answers Occurs when an extremely high energy photon strikes the nucleus and all of its energy is absorbed by the nucleus
It emits a nuclear fragment - correct answers In photodisintegration, how does the nucleus respond to all of the energy being absorbed?
Photodisintegration - correct answers Because of the high energy needed, this interaction is not relevant to diagnostic radiography.
Photoelectric absorption and Compton scattering - correct answers Which interactions MUST be considered by the radiographer when selecting technical factors?
Attenuated - correct answers A majority of the x-ray beam is _______________; only a small percent is exited to create the image
Interactions decrease - correct answers How does increasing kVp affect the percentage of photoelectric interactions?
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