a. The graph below is the decay curve for a radioactive isotope that emits is only -particles.

a. The graph below is the decay curve for a radioactive isotope that emits is only β-particles.

Use the graph to find the value of the half-life of the isotope. Indicate, on the graph, how you arrived at your value.

b. A student determines the percentage of β-particles absorbed by a thick aluminium sheet. He uses a source that is emitting only β-particles and that has a long half-life.

i. Draw a labelled diagram of the apparatus required, set up to make the determination.

ii. List the readings that the student needs to take.

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400 count rate 300 counts/min 200 100 10 20 30 time/min 40