A metal tool is left beside a sealed gamma source for one hour and is then taken away. What is true about the tool afterwards?
It is contaminated, because radioactive atoms are now on its surface
It is contaminated, and it will stay radioactive for about one hour
It has been irradiated, and it has not been made radioactive itself
It has been irradiated, and it now emits gamma radiation of its own
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.