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6. What is a half life?

  • The life of half of an isotope
  • The amount of time it takes for the radioactivity to get to zero
  • The amount of time it takes for the radioactivity of an isotope to half
  • The amount of radioactivity people are exposed to in half a lifetime

7. What is the order of most - least penetrating radiation?

  • Alpha, gamma, beta
  • Beta, alpha, gamma
  • Gamma, beta, alpha
  • Beta, gamma, alpha

8. What is gamma radiation?

  • A helium atom
  • Particles
  • An electromagnetic wave
  • A high energy electron

9. Which of these answers is a correct example of where background radiation comes from?

  • Rocks
  • Sound waves
  • Water
  • Pollen

10. Which type of radiation is stopped by paper and air?

  • Gamma
  • Alpha
  • Beta