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RADT 456: Rad Protec
ARRT Registry review covering radiation protection
| Question | Answer |
|---|---|
| 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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