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Question: Everyone is exposed to radiation on a continuing basis from either __________ or __________ sources.

Options:

  1.  Uranium, thorium
  2.  Radon, uranium
  3.  Natural, man-made
  4.  Terrestrial, extra-terrestrial

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3. Natural, man-made

Everyone is exposed to radiation on a continuing basis from either  Natural or man-made sources.

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