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15 cards from this deck
Radioactive
Random - cannot predict when individual atoms decay
Helium nucleus: 222 protons +2+ 2+2 neutrons
+2+2+2 (positive)
High-speed electron from nucleus
−1-1−1 (negative)
Electromagnetic waves/pure energy
000 charge, 000 mass
Ability to knock electrons off atoms
Very high
Medium
Low (hardly ionises at all)
Very low - stopped by paper or few cm of air
Medium - stopped by 333 mm aluminium
Very high - needs thick lead
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