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15 cards from this deck
No - it's random and unpredictable for individual nuclei
They break down and release radiation (radioactive decay)
Helium nucleus: 2 protons and 2 neutrons
+2 (positive)
Very strong
Thin sheet of paper or 5cm of air
High-speed electron ejected from nucleus
-1 (negative)
Few millimetres of aluminium
High-energy electromagnetic waves
Both 0 (neutral, no mass)
Thick lead or several metres of concrete
0 (neutral)
Inverse: high ionising = low penetrating, vice versa
If swallowed or breathed in (inside body)
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