A laboratory technician is working near a radioactive source that emits γ\gammaγ-rays.
Which action will not reduce the radiation dose received by the technician?
Placing a thick sheet of lead between the technician and the source.
Leaving the room as quickly as possible to minimize exposure time.
Increasing the air pressure in the laboratory.
Using long-handled tongs to increase the distance from 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.