(a(i))[2]
Name three kinds of nuclear emission produced by radioactive sources.
(a(ii))[1]
State the kind of nuclear emission that carries a relative charge of $+2$.
(a(iii))[1]
State the kind of nuclear emission that belongs to the electromagnetic spectrum.
(b(i))[2]
Find the fraction of technetium‑99m still present in a sample after 18 hours.
(b(ii))[2]
Fill in the table to give the number of each particle type in a neutral technetium‑99 atom.