ARRT registry review covering Unit 5: Radiation Protection
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each of the black spaces below before clicking
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| 1. According to NCRP, what is the monthly gestational dose-equivalent limit for embryo/fetus of a pregnant radiographer? | 5 mSv
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| 2. What cell type has the greatest radiosensitivity in the adult human? | lymphocytes
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| 3. What interaction between ionizing radiation and the target molecule that is most likely to occur? | indirect effect
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| 4. What is the approximate entrance skin exposure for the average AP supine abdomen radiograph? | 300 mrad
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| 5. What is the established annual occupational dose-equivalent limit for the lens of the eye? | 150 mSv
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| 6. What contributes the most to occupational exposure? | compton scatter
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| 7. What x-ray interaction with matter is responsible for the majority of scattered radiation reaching the IR? | compton scatter
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| 8. What type of crystals done a thermoluminescent dosimetry system use? | lithium fluoride
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| 9. Medical and dental radiation accounts for what percentage of the general public's exposure to human-made radiation? | 90%
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| 10. How does filtration affect the primary beam? | increases the average energy of the primary beam
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| 11. What is the minimum lead requirement for lead aprons, according to the NCRP? | 0.50mm Pb
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| 12. What is the appropriate ESE for the average upright PA chest radiograph using 15 kVp and a grid? | 20 mrad
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| 13. Primary radiation barriers must be at least how high? | 7 ft
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| 14. What unit of measure is used to express ionizing radiation dose to biologic material? | Rem (Sv)
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| 15. What is the skin response to radiation exposure that appears as hair loss called? | epilation
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| 16. What is the reduction in the intensity of an x-ray beam as it passes through material called? | attenuation
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| 17. What are late effects of radiation, whose incidence is dose related and for which there is no threshold dose, referred to as? | stochastic
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| 18. According to NCRP regulations, leakage radiation from the x-ray tube must not exceed____ | 100 mR/h
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| 19. Primary radiation barriers usually require what thickness of shielding? | 1/16 inch lead
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| 20. The skin response to radiation exposure, which appears as reddening of the irradiated skin area, is known as ______ | erythema
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| 21. The amount of time that x-rays are being produced and directed toward a particular wall is referred to as the ____ | use factor
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| 22. What acute radiation syndrome requires the largest exposure before any effects become apparent? | CNS
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| 23. What type of personnel radiation monitor can provide an immediate reading? | ionization chamber
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| 24. Isotopes are atoms that have the same ____ | atomic number but a different mass number
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| 25. What is the automatic exposure device that is located immediately under the x-ray table? | ionization chamber
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