A technician is setting up a safety barrier in a laboratory to block highly penetrating gamma (γ\gammaγ) radiation. Which of the following materials is the most effective shield to block this radiation?
paper
aluminium
lead
synthetic rubber
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.