A group of workers uses sealed radioactive sources in a factory.
Describe the difference between irradiation and radioactive contamination.
A metal spanner is used to tighten a bolt next to a sealed gamma source. Explain why the spanner does not become radioactive.
Give one precaution a worker should take to reduce the hazard from a sealed gamma source.
Contamination with an alpha-emitting isotope is more hazardous than contamination with a gamma-emitting isotope of the same activity. Explain why.
40 exam-style questions on AQA GCSE Physics 4.2 Atoms and nuclear radiation, covering 4.2.1 Radioactive decay and nuclear radiation, 4.2.2 Nuclear equations, 4.2.3 Half-lives and the random nature of radioactive decay, and 4.2.4 Radioactive contamination. Each one has a worked solution and a mark scheme showing where the marks go.