What level of radiation is safe?

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  2. #achievable
  3. #however
  4. #medical
  5. #worker
  6. #natural
  7. #limit
  8. #using
  9. #reasonably
  10. #current
  11. #radiation
  12. #sources
  13. #federal
  14. #exceed
  15. #occupational
  16. #millirems
  17. #exposure
  18. #adult