A lab technician needs to work with a sample of cesium-137, which is a beta and gamma emitter. Which of the following procedures will not reduce the radiation dose received by the technician?
Storing the source behind a thick lead shield.
Cooling the source to extremely low temperatures before handling.
Using long-handled tongs to increase distance from the source.
Minimizing the total time spent in close proximity to 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.