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: Miners are exposed to a higher than [[Mean Average|average]] level of '''background radiation''' because many rocks are sources of [[Ionising Radiation|ionising radiation]].
: Hospital workers are exposed to a higher than [[Mean Average|average]] level of '''background radiation''' because sources of [[Ionising Radiation|ionising radiation]] are used in medical imaging.
==Beyond the Curriculum==
{{#ev:youtube|https://www.youtube.com/watch?v=r1msbupjv08}}