An industrial technician needs to work near a radioactive source that emits γ\gammaγ-radiation.
Which of the following actions will not reduce the radiation dose received by the technician?
placing a thick concrete barrier between the technician and the source
keeping the source under extremely high pressure
maximizing the distance between the technician and the source
minimizing the duration of time the technician spends near the source
42 exam-style questions on CIE IGCSE Physics 5.2.5 Effects of ionising radiation and safety precautions. Each one has a worked solution and a mark scheme showing where the marks go.