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What is the order of penetration from least to most
Alpha, beta, gamma
What stops alpha
Paper
What stops beta
Aluminium
What stops gamma
Lead
What is the order of ionising power from least to most
Gamma, beta, alpha
What is the nature of alpha
2 protons, 2 neutrons
What is the nature of beta
An electron
What is the nature of gamma (Y)
Em wave
What do you need to do when measuring radiation
Measure background radiation first