Focus 1
Atomic Structure & Radiation
Paper 1 · Both
Teach it
Alpha, Beta, Gamma
Alpha = helium nucleus.
Half-life
Half-life is time for activity to halve.
Key facts
- Alpha is most ionising, least penetrating.
- Gamma is most penetrating.
Key terms
Quick check
A source has half-life 10 days. What fraction remains after 30 days?
2 marks · Paper 1