Why are radioactive gamma-ray sources stored in thick-walled containers made of lead?
Lead absorbs the highly penetrating gamma radiation.
Lead reduces the half-life of the radioactive source.
Lead increases the rate of radioactive decay inside the container.
Lead chemically neutralizes the radioactive isotope.
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.