A radioactive source is positioned in front of a radiation detector. When a thin sheet of paper is placed between them, the count rate remains high. However, when the sheet of paper is replaced by a 5 mm thick sheet of aluminium, the count rate drops to near background levels.
From this result, which type of radiation is the source primarily emitting?
α\alphaα-particles
β\betaβ-particles
γ\gammaγ-rays
X-rays
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.