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Outcomes:
State with examples that half-life is the time taken for the number of something to halve.
Explain that when a very large number of radioactive atoms decay, there is a simple pattern, despite the random nature of each decay
Determine the half-life from a graph of activity against time
Plot a graph of activity against time and use it to determine the half-life
Recall that elements have a wide range of half-life values and relate this to their uses
Calculate the half-life of an isotope from data of activity and time
Calculate the percentage or fraction of isotope left after a number of half-lives
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