Alpha: +2 charge, Helium nucleus, Range in air - cm, Highly ionising, Weak penetration (stopped by paper), Beta: -1 charge, electron, Range in air - metre, Moderately ionising, Moderately penetrating (stopped by aluminium), Gamma: No charge, Range in air - km, Electromagnetic wave, Very weak ionisation, Highly penetrating (reduced by thick lead/concrete),

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