Edexcel IGCSE Physics · Spec 7.2
Radioactivity: Alpha, Beta & Gamma
The three types of nuclear radiation — alpha, beta and gamma — and their properties.
Physics revision video
Radioactivity: Alpha, Beta & Gamma
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Spec 7.2
What you need to know
- Describe alpha, beta and gamma radiation
- Compare their penetrating power
- Explain why the nucleus decays
Active recall
Quick check
Answer each question before opening the answer.
What are alpha, beta and gamma radiation?
Alpha — a helium nucleus (2 protons + 2 neutrons); beta — a fast-moving electron; gamma — high-energy electromagnetic radiation.
Compare the penetrating power of alpha, beta and gamma.
Alpha is stopped by paper; beta by a few mm of aluminium; gamma is only reduced by thick lead or concrete.
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