(a)[2]
State which pair of atoms are isotopes of the same element, and justify your answer.
(b(i))[1]
State one example of the damage that X-rays may cause.
(b(ii))[2]
State and explain how radiographers can be protected from the damage caused by X-rays.
(c(i))[1]
Deduce the type of radiation given out by the radioactive source.
(c(ii))[1]
State why the meter does not give a reading of zero counts per second.