Mosby's ARRT Chapter 3: Practice Exam Questions and Answers | Already passed | Latest Update
Natural background radiation represents what percentage of humans' radiation exposure? a. 21% b. 50% c. 82% d. 5% : B The greatest source of natural background radiation exposure is: a. Cosmic rays b. Radioactive materials c. The body itself d. Radon gas 2 : D Cosmic radiation: a. is present only in space b. Is a source of exposure only to persons who lie in the sun c. Is of concern only to space travelers d. Is a part of natural background exposure : D Radon gas: a. Presents a danger when undetected b. Is present in doses proportional to other sources c. Is entirely human-made d. Is the source of 100% of annual background dose : A X-rays and gamma rays used in diagnostic imaging are: 3 a. Not of concern because the beam is filtered b. Part of the natural background dose c. Part of an artificial background radiation dos
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