Two workers are in a laboratory where radioactive sources are used.
Worker A stands near a sealed gamma source.
Worker B spills some radioactive powder, and some of the powder gets onto her hands.
State which worker, A or B, has been contaminated.
State what is meant by irradiation.
Worker A does not become radioactive.
Explain why.
Explain why the hazard to worker B continues after she leaves the laboratory.
97 exam-style questions on Edexcel GCSE Physics 6.5 Uses and dangers of radioactivity, covering 6.5.1 Uses of radioactivity, 6.5.2 Dangers of ionising radiation and precautions, 6.5.3 Half-life and radiation dangers, 6.5.4 Safety precautions for radiation exposure, and 6.5.5 Contamination and irradiation. Each one has a worked solution and a mark scheme showing where the marks go.