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RADT 456 Unit 5

ARRT registry review covering Unit 5: Radiation Protection

QuestionAnswer
1. According to NCRP, what is the monthly gestational dose-equivalent limit for embryo/fetus of a pregnant radiographer? 5 mSv
2. What cell type has the greatest radiosensitivity in the adult human? lymphocytes
3. What interaction between ionizing radiation and the target molecule that is most likely to occur? indirect effect
4. What is the approximate entrance skin exposure for the average AP supine abdomen radiograph? 300 mrad
5. What is the established annual occupational dose-equivalent limit for the lens of the eye? 150 mSv
6. What contributes the most to occupational exposure? compton scatter
7. What x-ray interaction with matter is responsible for the majority of scattered radiation reaching the IR? compton scatter
8. What type of crystals done a thermoluminescent dosimetry system use? lithium fluoride
9. Medical and dental radiation accounts for what percentage of the general public's exposure to human-made radiation? 90%
10. How does filtration affect the primary beam? increases the average energy of the primary beam
11. What is the minimum lead requirement for lead aprons, according to the NCRP? 0.50mm Pb
12. What is the appropriate ESE for the average upright PA chest radiograph using 15 kVp and a grid? 20 mrad
13. Primary radiation barriers must be at least how high? 7 ft
14. What unit of measure is used to express ionizing radiation dose to biologic material? Rem (Sv)
15. What is the skin response to radiation exposure that appears as hair loss called? epilation
16. What is the reduction in the intensity of an x-ray beam as it passes through material called? attenuation
17. What are late effects of radiation, whose incidence is dose related and for which there is no threshold dose, referred to as? stochastic
18. According to NCRP regulations, leakage radiation from the x-ray tube must not exceed____ 100 mR/h
19. Primary radiation barriers usually require what thickness of shielding? 1/16 inch lead
20. The skin response to radiation exposure, which appears as reddening of the irradiated skin area, is known as ______ erythema
21. The amount of time that x-rays are being produced and directed toward a particular wall is referred to as the ____ use factor
22. What acute radiation syndrome requires the largest exposure before any effects become apparent? CNS
23. What type of personnel radiation monitor can provide an immediate reading? ionization chamber
24. Isotopes are atoms that have the same ____ atomic number but a different mass number
25. What is the automatic exposure device that is located immediately under the x-ray table? ionization chamber
Created by: kechambers on 2012-03-10



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