Background radiation is just radiation that is everywhere but it is only at a low level so it doesn't harm humans :) It comes from...
- cosmic rays (from the sun)
-living things (there is a little bit of radioactive material in all living things - including you and me!)
- substances on Earth (e.g. air, food, soil, rocks, building materials)
NOTE: radiation can also occur due to human activity. For example, there is a very high amount of radiation surrounding the areas of Chernobyl and Fukushima since they are the scenes of nuclear power plant disasters
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