When a radioactive source is not in use in a laboratory, what is the safest way to store it to minimize exposure?
In a locked, lead-lined box inside a metal cupboard
Wrapped in aluminum foil on an open shelf
In a sealed glass bottle containing water on a bench
Under a fume cupboard with the extractor fan turned on
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.