Two groups of people were studied after an accident at an industrial site. One group had been contaminated with a radioactive isotope. The other group had been irradiated by a sealed source but was not contaminated.
Explain why the hazard to the two groups of people is different.
The findings of the study were published in a scientific journal. Explain why publishing the findings makes the conclusions more reliable.
Give two precautions that reduce the hazard to a worker who handles sealed radioactive sources. Do not refer to storing the sources in your answer.
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.