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Cosmic radiation, terrestrial radiation sources and radioactive potassium in the body are all examples of:

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Question: Cosmic radiation, terrestrial radiation sources and radioactive potassium in the body are all examples of

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  1.  Radioactive contamination
  2.  Natural background radiation
  3.  Man-made radiation

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2. Natural background radiation

Cosmic radiation, terrestrial radiation sources and radioactive potassium in the body are all examples of natural background radiation.

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