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In a photoelectric interaction, what happens to the photon?

• It looses no energy but is deflected by the electron

• It temporarily looses all of it's energy but is re-emitted as the atom returns to a ground state.

• It looses at energy equal to the binding energy of the electron plus some additional energy depending on it's angle of incidence

• It looses all of it's energy

A radionucleide is observed to decay to 33.3% of its initial activity in 36.6 days. What is the decay constant of the radionuclide?

• 0.18

• 0.36

• 0.06

• 0.03

True o false: Beta-decay is an isobaric process

• True

• False

For photons in megavoltage range traversing water, what is the dominant interaction mechanism?

• Photoelectric

• Coherent scattering

• Compton scattering

• Pair production

Select all decay products emitted in a continuous energy spectrum.

• Gamma ray emitted from Internal Conversion

• Characteristic x-rays emitted after Electron Capture

• Positron emitted by Beta+ Decay

• Alpha particle emitted by Alpha Decay

• Electron emitted by Beta- Decay

What is the ratio of Compton interaction in 1kg of hydrogen to 1kg of oxygen?

• 1:1

• 1:3

• 2:1

• 3:1

A novel alloy has an HVL of 1.3cm. What percentage of the primary beam will be absorbed by a 5cm block of this novel alloy?

• >99%

• 93.1%

• 83.5%

• 97.2%

Which statement(s) are false regarding internal conversion? (Select all that apply)

• K-shell electrons are the most commonly emitted electrons.

• An electron is emitted with kinetic energy equal to that of the atomic de-excitation energy.

• Gamma decay is a competitive process with internal conversion.

• Internal conversion reduces the energy state of the electron orbitals.

What is the minimum energy of a pair production interaction with an electron?

• 0.511 MeV

• 1.022 MeV

• 2.04 MeV

• 0.255 MeV

Which of the following statements is false regarding alpha decay?

• Alpha particles are emitted with a continuous energy spectrum

• Radium-223 primarily decays via alpha decay

• Alpha decay primarily occurs in heavy (Z > 82) atoms.

• Alpha decay results in the emission of a helium nucleus.