nuclear radiation
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6 Terms
1
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nuclear radiation
the nuclei of some atoms are unstable and give out radiation
this is a random process
count rate is the number of decays each second measured by a geiger-muller tube
the decay of nuclei is measured in Bq
2
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alpha
2 protons and neutrons
weakly penetrating
stopped by paper of 5cm of air
very ionising
3
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beta
high energy electron
more penetrating than alpha
stopped by aluminium foil or 100 cm of air
less ionising than alpha
4
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gamma
electromagnetic wave
very penetrating
sopped by thick lead
least ionising
5
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neutron
very penetrating
6
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half life
time taken for count rate of the number of nuclei to decrease by half
Note 
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