A medical physics department uses a sample of a technetium-99m isotope as a tracer for diagnostics. This isotope has a half-life of 6 hours.
A technician measures an initial count rate of 320 Bq from this sample.
Complete the graph on Figure 1, as accurately as possible, to show how the count rate from this tracer changes over 24 hours.
The first point at 0 hours is already plotted on Figure 1.
