64071
Description
Quiz by bethany.adkins22, updated more than 1 year ago
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Created by bethany.adkins22
over 11 years ago
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Question 1
Question
Coherent scatter will only occur...
Answer
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at high energies
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When the photon has energy greater than the electron binding energy
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At low photon energies
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After a previous interaction
Question 2
Question
The probability of compton scatter occurring is...
Answer
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Is proportional to energy
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Is proportional to density squared
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Is proportional to electron density
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Is inversely proportional to energy
Question 3
Question
What happens to the positron produced after pair production?
Answer
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It travels through matter and excites and ionises atoms
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It is absorbed by an x-ray photon
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It will interact with the nucleus of an atom
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It combines with an electron- annihilation
Question 4
Question
In a low energy compton scatter interaction, where is most of the energy deposited?
Answer
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The initial photon
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The ejected electron
Question 5
Question
Electrons produced in all interactions...
Answer
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Will have the same energy as the initial photon
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Will produce a photoelectron
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Will carry some energy from the initial photon
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Transferred to the medium by ionisation or excitations
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Can result in x-ray production
Question 6
Question
How much energy must a photon have to undergo photoelectric interactions?
Answer
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1.022meV
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More than the binding energy of a bound electron
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More than the binding energy of the k shell
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0.511meV
Question 7
Question
The probability of pair production is...
Answer
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Is proportional to energy squared
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Is inversely proportional to z
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Is proportional to energy
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Is proportional to z
Question 8
Question
What is the Linear Attenuation Coefficient (LAC)?
Answer
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Fraction of photons interacting per gram of material
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Fraction of photons interacting per unit thickness of attenuator
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Fraction of electrons interacting relative to Z of material
Question 9
Question
To undergo a pair production interaction, how much energy must the initial photon have?
Answer
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0.511meV
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Enough to overcome the binding energy of the electron
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1.022meV
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1.022kV
Question 10
Question
What is produced in the photoelectric effect?
Answer
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An electron and a positron
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The photon is diffracted
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Nothing
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An electron is ejected and a new photon produced.
Question 11
Question
The probability of photoelectric absorption....
Answer
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Is proportional to z sqaured.
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Is proportional to z cubed.
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Is inversely proportional to energy cubed.
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Is proportional to energy cubed.
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