Question

Where does radioactivity come from?

a the decay of certain atomic nuclei
b the atom losing electrons
c radioactive material
d U-238

Answer 1

C. radioactive material

Step-by-step 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.