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Created page with "==Key Stage 4== ===Meaning=== right|300px|thumb|The [[hazard symbol for a '''radioactive''' sample.]] '''Radioactivity''' is the emi..."
==Key Stage 4==
===Meaning===
[[File:IonisingRadiationSymbol.png|right|300px|thumb|The [[hazard]] symbol for a '''radioactive''' [[sample]].]]
'''Radioactivity''' is the [[emission]] of [[Ionising Radiation|ionising radiation]] from a [[sample]] of [[Unstable Isotope|unstable isotopes]].
===About Radioactivity===
: The '''radioactivity''' of a [[sample]] is measured in [[Becquerel]]s (Bq) which is the number of [[Radioactive Decay|radioactive decays]] in a [[sample]] per [[second]].
: The '''radioactivity''' of a [[sample]] depends upon the amount of [[Unstable Isotope|unstable isotopes]] in the [[sample]] and the [[Half Life|half life]] of the [[isotope]].
===Meaning===
[[File:IonisingRadiationSymbol.png|right|300px|thumb|The [[hazard]] symbol for a '''radioactive''' [[sample]].]]
'''Radioactivity''' is the [[emission]] of [[Ionising Radiation|ionising radiation]] from a [[sample]] of [[Unstable Isotope|unstable isotopes]].
===About Radioactivity===
: The '''radioactivity''' of a [[sample]] is measured in [[Becquerel]]s (Bq) which is the number of [[Radioactive Decay|radioactive decays]] in a [[sample]] per [[second]].
: The '''radioactivity''' of a [[sample]] depends upon the amount of [[Unstable Isotope|unstable isotopes]] in the [[sample]] and the [[Half Life|half life]] of the [[isotope]].