A teacher demonstrates a sealed gamma source in a classroom. Which precaution most reduces the radiation the teacher receives?
Holding the source with long tongs at arm's length
Wearing a pair of thin disposable plastic gloves
Pointing the source away from the window of the room
Wearing a white laboratory coat while using the source
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.