A container is designed to safely store a radioactive isotope that emits high-energy gamma (γ\gammaγ) radiation.
Which of the following materials is the most effective at absorbing this radiation to prevent it from escaping?
a sheet of paper
a sheet of aluminium
a block of lead
a thin layer of plastic
134 exam-style questions on CIE IGCSE Physics 5.2.2a Alpha, beta and gamma emission. Each one has a worked solution and a mark scheme showing where the marks go.