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RADT456 Rad. Protect
ARRT review Radiation Protection
| Question | Answer |
|---|---|
| What is teh type of does-response curve used to predict stochastic effect? | Linear nonthreshold |
| What can the useful x-ray beam be accurately described as ahving what sort of nature? | heterogeneous |
| How are wavelength and energy related? | inversely |
| Long-term effects of radiation exposure are: | formation of cataracts, cancer, genetic effects |
| What does beam restriction do? | reduces patient dose, reduces production of scattered radiation, imporves image quality |
| What is teh qality assurance term used to describe consistency in exposure at adjacent mA stations? | linearity |
| How does filtration affect the primary beam | filtration increases the average energy of the primary beam |
| What is patient dose affected by? | inherent filtration, added filtration, and source-image distance |
| What is the principal function of x-ray beam filtration? | reduce patient skin dose |
| What can patient dose be decreased by? | high-speed film and screen combination |
| What are types of gonadal shielding? | flat contact, shaped (contour) contact, and shadow |
| What are advantages of beam restriction? | production of less scattered radiation, irradiation of less biological material |
| What does a backup timer for the automatic exposure control device serve? | protect the patient from overexposure, protect the x-ray tube from excessive heat |
| Primary radiation barriers must be at least how high? | 7 feet |
| What is the protective control booth from which the radiographer makes the x-ray exposure? | a secondary barrier |
| What does the NCRP recommed the annual effective occupational dose-equivalent limit? | 50mSv (5 rem) |
| What is the unit of measurement used to express occupational exposure is? | Rem (Sievert) |
| What crystals are used in an optically luminescent dosimetry system? | Aluminum oxide |
| What is teh measurement of dose to biologic tissue? | Rem (Sv) |
| What is teh annual dose limit for a student radiographer who is younger than 18 years old and beginning clinical assignments? | .1 rem (1mSv) |
| What can the operation of personal radiation monitoring devices depend on? | ionization and thermoluminescence |
| What are some examples of personal radiation monitors? | optically stimulated luminescence, thermoluminescent dosimeter, film badge, and pocket dosimeter |
| What do primary barriers protect your from? | they protect you from the useful beam |
| What are the three cardinal rules of radiation protection? | time, distance, shielding |
| What does ALARA stand for? | as low as reasonably achievable |
Created by:
anbrunes
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