(a(i))[1]
On Fig. 9.1, draw the path of α-particles within the magnetic field and label it α.
(a(ii))[2]
On Fig. 9.1, draw the path of β-particles within the magnetic field and label it β.
(a(iii))[1]
On Fig. 9.1, draw the path of γ-radiation within the magnetic field and label it γ.
(b(i))[1]
Define the half-life of a radioactive isotope.
(b(ii))[4]
State the most suitable radioactive source from Table 9.1 for the machine in Fig. 9.2. Explain why that source is the most suitable and why the other sources are not suitable.