Background radiation comes from many sources.
Background radiation is present all the time and is everywhere we go.
Background radiation comes from:
Radioactivity of naturally occuring unstable isotopes which are all around us - in the air, in food, in building materials and in the rocks under our feet.
Radiation from space, which is known as cosmic rays. These come from the sun.
Radiation due to man-made sources like nuclear weapons tests, nuclear accidents (like what happend at Chernobyl) or dumped nuclear waste.
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