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Physical Principles Quiz on Interaction with matter, created by bethany.adkins22 on 30/04/2013.

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Interaction with matter

Question 1 of 11

1

Coherent scatter will only occur...

Select one of the following:

  • at high energies

  • When the photon has energy greater than the electron binding energy

  • At low photon energies

  • After a previous interaction

Explanation

Question 2 of 11

1

The probability of compton scatter occurring is...

Select one or more of the following:

  • Is proportional to energy

  • Is proportional to density squared

  • Is proportional to electron density

  • Is inversely proportional to energy

Explanation

Question 3 of 11

1

What happens to the positron produced after pair production?

Select one or more of the following:

  • It travels through matter and excites and ionises atoms

  • It is absorbed by an x-ray photon

  • It will interact with the nucleus of an atom

  • It combines with an electron- annihilation

Explanation

Question 4 of 11

1

In a low energy compton scatter interaction, where is most of the energy deposited?

Select one of the following:

  • The initial photon

  • The ejected electron

Explanation

Question 5 of 11

1

Electrons produced in all interactions...

Select one or more of the following:

  • Will have the same energy as the initial photon

  • Will produce a photoelectron

  • Will carry some energy from the initial photon

  • Transferred to the medium by ionisation or excitations

  • Can result in x-ray production

Explanation

Question 6 of 11

1

How much energy must a photon have to undergo photoelectric interactions?

Select one of the following:

  • 1.022meV

  • More than the binding energy of a bound electron

  • More than the binding energy of the k shell

  • 0.511meV

Explanation

Question 7 of 11

1

The probability of pair production is...

Select one or more of the following:

  • Is proportional to energy squared

  • Is inversely proportional to z

  • Is proportional to energy

  • Is proportional to z

Explanation

Question 8 of 11

1

What is the Linear Attenuation Coefficient (LAC)?

Select one of the following:

  • Fraction of photons interacting per gram of material

  • Fraction of photons interacting per unit thickness of attenuator

  • Fraction of electrons interacting relative to Z of material

Explanation

Question 9 of 11

1

To undergo a pair production interaction, how much energy must the initial photon have?

Select one of the following:

  • 0.511meV

  • Enough to overcome the binding energy of the electron

  • 1.022meV

  • 1.022kV

Explanation

Question 10 of 11

1

What is produced in the photoelectric effect?

Select one of the following:

  • An electron and a positron

  • The photon is diffracted

  • Nothing

  • An electron is ejected and a new photon produced.

Explanation

Question 11 of 11

1

The probability of photoelectric absorption....

Select one or more of the following:

  • Is proportional to z sqaured.

  • Is proportional to z cubed.

  • Is inversely proportional to energy cubed.

  • Is proportional to energy cubed.

Explanation

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