Radioactive Materials

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1. What is the half-life of a radioisotope?

  • The amount of half the radiation to decay.
  • The time taken for the atoms to decay
  • The time taken for half of all the atoms to decay
  • Half of the time taken for the atoms to decay.
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2. What radiation is used to treat cancer?

  • Beta
  • Alpha and Beta
  • Gamma
  • Beta and Gamma

3. What is the smallest part of an element?

  • Neutrons
  • Electrons
  • Atom
  • Protons

4. On a paper thickness guage, what will happen to the radiation if the sheet becomes thicker?

  • It will decay
  • It will increase
  • It will decrease
  • It will emit gamma radiation

5. What is the main isotope in food?

  • K-40
  • C-14
  • C-15
  • I-123
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