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7 June, 04:40

Where does radioactivity come from?

a the decay of certain atomic nuclei

b the atom losing electrons

c radioactive material

d U-238

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Answers (1)
  1. 7 June, 08:19
    0
    C. radioactive material

    Explanation:

    This exposure primarily comes from cosmic rays, radioactive material in the earth (such as uranium-238), ingestion of naturally occurring radionuclides in food (such as potassium - 40), and inhalation of radon gas. In the United States, the average background radiation dose is 300 mrem/yr.
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