When working with a gamma-emitting radioactive source, which of the following measures does not reduce the radiation dose received by a user?
Handling the source with long-handled tongs to increase distance.
Reducing the total duration of time spent near the source.
Storing the source in a container filled with ice to lower its temperature.
Placing a thick lead screen between the source and the worker.
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.