NUCLEAR MEDICINE EXAM QUESTIONS
AND CORRECT DETAILED ANSWERS
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| 2024-2025
Nuclides with the same atomic number but different numbers of neutrons are called?
✓ Isotopes
Two nuclides with the same atomic numbers are called?
✓ Isobars
Two nuclides with the same number of neutrons but different atomic numbers are called?
✓ Isotones
What is a radionuclide?
✓ A nuclide that emits particular or photon energy to achieve a more stable energy state
Another name for a helium ion containing two protons and two neutrons is?
✓ an alpha particle
What is a beta particle?
✓ An electron
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Why are alpha particles and beta particles not used for imaging?
✓ They do not exit the body efficiently and thus are not detected
What ratio of protons to neutrons favors beta decay?
✓ A low proton-to-neutron ratio, as compared with stable nuclei
What two particles are emitted from the nucleus during beta decay?
✓ A beta particle (electron) and an antineutrino
What is the relationship between the mean energy of beta spectrum?
✓ The mean energy is approximately one third of the maximum energy
What ratio of protons to neutrons favors positron decay?
✓ A high proton-to-neutron ratio
What particles are released from the nucleus during positron decay?
✓ A positron (antielectron) and Neutrino
What is the minimum amount of nuclear energy required for positron decay?
✓ 1.02MeV
What is the fate of a positron?
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✓ To travel a short distance, combine with an electron, and be annihilated
When a positron is annihilated via combination with an electron, the result is the production of?
✓ Two nearly opposed 511 keV photons
What ratio of protons to neutrons favors electron capture decay?
✓ A high proton-to-neutron ratio
What particle is released from the nucleus during electron capture decay?
✓ A neutrino
What is released from the nucleus during isometric transition?
✓ Gama rays
Other than wavelength, frequency, and energy intensity, the fundamental difference between
X-rays and gamma rays is?
✓ that x-rays are produced from energy released due to changes in the quantum
levels/values of orbital electrons of an atom, while gamma rays are produced from
energy shifts in the nucleus
When energy from a nuclear transition results in the emission of an orbital electron rather than
a gamma ray, this process is called?
✓ internal conversion
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Internal conversion electrons increase the radiation dose to the patient because?
✓ Energy from the electron is absorbed within the patients body
When energy from an orbital transition results in the emission of an orbital electron rather
than an X-ray, the electron is called?
✓ An Auger electron
What does the term "Metastable" mean?
✓ When an isomeric state is long-lived longer
After an electron is ejected from an inner shell orbital. what occurs?
✓ Outer shell electrons release energy by moving to now unoccupied, less energic inner
orbitals; the energy released by this transition is termed "characteristic of x-ray radiation"
What are the two methods used to create synthetically radioactive materials?
✓ Radioactive materials are produced by bombarding a target material with either ions or
with neutrons
A_______ us used to bombard elements with neutrons
✓ nuclear reactor
An______is used to bombard elements with protons
✓ accelerator (linear or cyclotron)
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