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13 cards from this deck
222 protons and 222 neutrons
Around 5 cm
A single sheet of paper
Very strongly ionising
An electron ejected from the nucleus
Neutron changes into a proton and an electron
About 15 cm
A few millimetres of aluminium
Quite strongly ionising
Electromagnetic radiation from the nucleus
Several metres
Thick sheets of lead or metres of concrete
Weakly ionising
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