A researcher wants to select a barrier to block α\alphaα-particles and β\betaβ-particles while allowing most γ\gammaγ-rays to pass through. Which material is most suitable for this barrier?
paper
aluminium
lead
concrete
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.