How many xrays are safe in a lifetime?

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  1. #chest
  2. #american
  3. #recommends
  4. #limiting
  5. #exposure
  6. #equal
  7. #radiation
  8. #college
  9. #lifetime
  10. #diagnostic
  11. #therefore
  12. #scans
  13. #higher
  14. #radiology