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RADT 456: Rad Protec

ARRT Registry review covering radiation protection

QuestionAnswer
What type of exposure switch must be present on mobile radiographic equipment? "dead-man" type
What is the established annual occupational does-equivalent limit for the lens of the eye? 150 mSv
What is the x-ray interaction with matter that is responsible for the majority of scattered radiation reaching the image receptor? compton scatter
According to the NCRP, what is the annual occupational whole-body dose-equivalent limit? 50 mSv
What crystal would the thermoluminescent dosimetry system use? lithium fluoride
Medical and dental radiation accounts for what percentage of the general public's exposure to human-made radiation? 90%
How does filtration affect the primary beam? It increases the average energy of the primary beam
What is the minimum lead requirement for lead aprons, according to the NCRP? 0.5 mm Pb
Primary radiation barriers must be at least how high? 7 ft
What is the annual does limit for occupationally exposed individuals valid for? beta, x-, and gamma radiations
What happens to patient dose as fluoroscopic field of view decreases? it increases
What is the skin response to radiation exposure that appears as hair loss? epilation
What is the term for the reduction in the intensity of an x-ray beam as is passes through material? attenuation
Which type of dose-response relationship represents radiation-induced leukemia and genetic effects? linear, nonthreshold
What is the term for late effects of radiation, whose incidence is does related and for which there is no threshold? stochastic effects
According to the NCRP, what must leakage radiation from the x-ray tube not exceed? 100 mR/h
For radiographic examinations of the skull, which projection is preferred? PA
According to the NCRP, what is the annual occupational does-equivalent limit to the thyroid, skin, and extremities? 500 mSv
What is the skin response to radiation exposure that appears as reddening of the irradiated skin area? erythema
What is the term for the amount of time that x-rays are being produced and directed toward a particular wall? use factor
What is the unit of measurement used to express occupational exposure? rem
Which type of personnel radiation monitoring can provide an immediate reading? ionization chamber
What are isotopes? atoms that have the same atomic number but different mass numbers
The source-skin distance in mobile fluoroscopy must be a minimum of what? 12 inches
What is the name for the automatic exposure device that is located immediately under the x-ray table? ionization chamber
Created by: jess07
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