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→Sources of Background Radiation
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|[[File:BackgroundRadiation.png|center|300px]]
| style="height:20px; width:300px; text-align:left;" |'''Food''': Many of our foods contain small quantities of radioactive isotopes. Figure A shows a Banana containing Potassium-40, a gamma emitter. The Potassium-40 in your body means the average person emits around 108 gamma rays every second.
'''The Ground''': Rocks under the ground have small quantities of radioactive isotopes and so gamma rays are being emitted from beneath our feet all the time.