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There were 3 types of radioactivities: Alpha, Beta, and Gamma.

Alpha: Made from 2 protons and 2 neutrons

Charge: +2

Mass: 4

Speed: 1/10 the speed of light

Ionising power/Danger: Very High

Stopped by: 4cm of air or thick paper

Beta: Made from one electron

Charge: -1

Mass: 1/1800

Speed: 9/10 the speed of light

Ionising power/Danger: Medium

Stopped by: 3-5mm aluminium/led

Gamma: Is an electromagnetic wave

Charge: no charge

Mass: 0

Speed: = speed of light

Ionising power/Danger: Very low

Stopped by: Can't be stopped (unstoppable)

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