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

  • Alpha
  • Beta
  • Gamma

8. What blocks beta radiation?

  • Thin sheet of aluminium
  • Sheet of felt
  • Slightly thick sheet of paper
  • 3cm of air

9. How many neutrons does an alpha particle have?

  • 6
  • 2
  • 4
  • 1

10. What is the order of most - least ionising radiation?

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