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→Key Stage 5
==Key Stage 5==
===Meaning===
[[Background Radiation|Background radiation]] is [[Ionising Radiation|radiation]] due to naturally occurring [[radioactive]] substances in the environment.
===About Background Radiation===
*[[Radon]] [[gas]] from the soil contributes to indoor [[Background Radiation|background radiation]].
*[[Cosmic Rays|Cosmic rays]] from space add to the background [[Ionising Radiation|radiation]] level.
==Beyond the Curriculum==
{{#ev:youtube|https://www.youtube.com/watch?v=r1msbupjv08}}