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:[https://www.amazon.co.uk/gp/product/0198359837/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=0198359837&linkCode=as2&tag=nrjc-21&linkId=3c4229e8b023b2b60768e7ea2307cc6f ''Background radiation, pages 182, 236-237, Gateway GCSE Physics, Oxford, OCR '']
==Key Stage 5==
===Meaning===
[[Background radiation]] is [[Ionising Radiation|radiation]] due to naturally occurring [[radioactive]] substances in the environment.
===About Background Radiation===
*Comes from sources such as the ground, building materials, and [[Cosmic Radiation|cosmic radiation]].
*[[Measure]]d in units of [[Becquerel]]s (Bq) per [[kilogram]].
*Contributes to the [[radiation]] dose received by humans.
===Examples===
*[[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}}