How much radiation is safe per day?

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  1. #commonly
  2. #exposure
  3. #while
  4. #greater
  5. #background
  6. #receive
  7. #expect
  8. #measured
  9. #moderate
  10. #radiation
  11. #occurring
  12. #naturally
  13. #considered
  14. #average
  15. #person
  16. #millisieverts