45. NUCLEAR MEDICINE: SPONTANEOUS FISSION Flashcards

1
Q
  1. How can nuclei with very large atomic mass numbers disintegrate?
A
  • they can split into two nearly equal fission fragments
  • this usually happens to nuclei that have atomic masses
    greater than 92
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2
Q
  1. What does Spontaneous Fission (SF) result in?
A
  • the spontaneous emission of 2-4 neutrons
  • there is a significant amount of energy released
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3
Q
  1. What kind of process does Spontaneous Fission follow?
A
  • the same process as Neutron-induced Nuclear fission
  • Spontaneous Fission is not self-sustaining
  • it occurs in Radioactive Nuclei
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4
Q
  1. List 4 elements that experience Spontaneous Fission?
A
  1. Thorium
  2. Protactinium
  3. Uranium
  4. Transuranic Elements
    (these are the elements higher than Uranium)
    ( they have an atomic number greater than 92)
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5
Q
  1. What kinds of elements are Transuranic Elements?
A
  • they are man-made
  • they are synthesised in Nuclear Reactions
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6
Q
  1. What process does Spontaneous Fission compete with?
A
  • Alpha Decay
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7
Q
  1. What happens to elements that have an atomic mass number above Uranium (A=238)?
A

THE HIGHER THIS ATOMIC MASS NUMBER:
- the more prominent the Spontaneous Fission
- the shorter the half life

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8
Q
  1. How does Spontaneous Fission act as a limiting factor?
A

IT ACTS AS A LIMITING FACTOR:
- in how high the atomic number of an element can go
- in how high the atomic mass number can go
- in terms of producing new elements

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