(a(i))[1]
State the name given to the beta-plus particle.
(a(ii))[1]
Show that the decay constant of fluorine-18 equals $1.05 \times 10^{-4}\,\text{s}^{-1}$.
(a(iii))[3]
Determine the activity for $2.1 \times 10^{-12}\,\text{kg}$ of fluorine-18.
(b(i))[3]
Describe how the interaction between a $\beta^{+}$ particle and an electron in the body makes image formation possible.
(b(ii))[2]
Suggest why 110 minutes is an appropriate half-life for a nuclide used as a tracer in medical diagnosis.