Physics AQA Radiation
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4 Terms
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Radioactive decay
Some atom’s nuclei are unstable
Gives out radiation,so that they are more stable
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Activity
Rate of which sources of unstable nuclei decay
Measured in Becquerel (Bq)
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Count rate
Number of decays per second recorded by detectors(Geiger-Muller Tube)
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Nuclear radiation l
Alpha(α)=2 neutrons and 2 protons(Hydrogen)
Penetrating power=Stopped by single sheets of paper
Range in air=5cm
Ionising=Very strongly ionising
Note 
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