(a(i))[1]
State what background radiation means.
(a(ii))[1]
State one source that contributes significantly to background radiation.
(b(i))[2]
Complete the nuclide equation for this decay: $^{223}_{88}\text{Ra} \rightarrow \; [\text{BLANK}]\text{Rn} + [\text{BLANK}]\alpha$.
(b(ii))[1]
Explain why the source must be placed inside the body.
(c(i))[1]
Explain why gamma radiation is the chosen source.
(c(ii))[1]
Explain why a source with a short half-life has to be used.