Radioactive materials give out nuclear radiation from the nucleus of ech of their atoms. The atoms are unstable and decay naturally. During this decay, radiation can be given out in the form of alpha, beta and gamma rays:
- An alpha particle is a helium nucleus.
- A beta particle is a fast-moving electron.
- Gamma is an electromagnetic wave (energy).
Radiation is measure by the number of nuclear decays emitted per second. This number decreases with time.
Ionisation occurs when an uncharged (neutral) atom gains or loses and electrons.
Alpha radiation is highly ionising because it's missing two electrons (it has a +2 electric charge). It attracts electrons away from atoms it passes, leaving them positively charged.
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