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