A laboratory technician is working with a sample of polonium-210, which is a strong alpha emitter.
Explain why accidentally ingesting a small amount of this substance poses a severe biological hazard to the technician, whereas holding the sealed vial containing the substance with bare hands poses virtually no danger.
94 exam-style questions on Edexcel GCSE Physics 6.5 Uses and dangers of radioactivity. Each one has a worked solution and a mark scheme showing where the marks go.