(a)[2]
State two contrasts between nuclear fission and nuclear fusion.
(b(i))[2]
Explain why a source of γ-rays used in this way should not have a half-life that is shorter or longer than about 6 hours.
(b(ii))[3]
Complete the nuclide equation shown for this decay. $^{99}_{42}\text{Mo} \rightarrow \ldots\ldots\, \text{Tc} + \ldots\ldots\, \beta$
(b(iii))[1]
State one more medical use of radioactive nuclides.