_______________________________ DCA05DR Dental Radiation Health, Safety, and Protection, 3rd Edition
11. The numerical value given to different tissues such as the brain, gonads, bone marrow, thyroid gland, and skin, known as the tissue-weighting factor , is defined by the: A) American Cancer Society. B) International Commission on Radiological Protec- tion. C) National Council on Radiation Protection and Measurements. D) Occupational Safety and Health Administration.
17. The best way to ensure personnel compliance with radiation safety practices and track occupational exposure is to: A) Complete a daily log of radiographic procedures. B) Track the number of films used in a given day. C) Use occupational radiation monitoring devices. D) Calculate the total kVp used for each unit. 18. Joint recommendations for prescribing dental radiographs have been established by the American Dental Association Council on Scientific Affairs, the Public Health Service, and the: A) International Commission on Radiation Units and Measurements. B) National Council on Radiation Protection and Measurements. C) Occupational Safety and Health Administration. D) Food and Drug Administration. 19. Federal law requires that a dental x-ray machine operating below 70 kVp have a minimum aluminum filtration of:
12. For people living in the United States, 50% of radiation exposure derives from:
A) Industrial products. B) Consumer products. C) Natural background radiation. D) Occupational radiation.
13. In the United States, most people receive an average annual dose of cosmic radiation of:
A) 0.12 mSv. B) 0.33 mSv. C) 0.56 mSv. D) 0.71 mSv.
A) 1.5 mm. B) 2.0 mm. C) 2.5 mm. D) 3.0 mm.
14. The single largest contributor to the phenomenon of natural radiation is: A) Radon.
20. Because it decreases the radiation dose nearly 60%, the preferred type of collimation is: A) Rectangular. B) Circular. C) Square. D) Triangular.
B) Uranium. C) Thorium. D) Potassium.
15. The largest contributor to artificial radiation is: A) Medical diagnostic imaging. B) Industrial sources. C) Occupational exposure. D) Consumer products. 16. With no barrier present, a clinician should stand at least 6 feet away and should stand in relation to the primary beam at an angle of:
21. Which speed of film provides the lowest radiation exposure to the patient?
A) C-speed. B) D-speed. C) E-speed. D) F-speed.
A) 10° to 50°. B) 60° to 80°. C) 90° to 135°. D) 140° to 160°.
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