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13 cards from this deck
2 neutrons and 2 protons
Around 5 cm
A single sheet of paper
Very strongly ionising
An electron ejected from the nucleus
A neutron changes into a proton and electron
About 15 cm
A few millimetres of aluminium
Quite strongly ionising
Electromagnetic radiation
Several metres
Thick lead sheets or metres of concrete
Weakly ionising
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