Besides cosmic rays, what are the other two main natural sources contributing to a person's radiation exposure on Earth?

Answer

Terrestrial radiation and internal radiation

Natural radiation exposure on the ground is derived from three sources: cosmic rays, terrestrial radiation originating from radioactive elements in the ground, and internal radiation from naturally occurring isotopes that are ingested or inhaled.

Besides cosmic rays, what are the other two main natural sources contributing to a person's radiation exposure on Earth?
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