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Radiation Protection

Quiz yourself by thinking what should be in each of the black spaces below before clicking on it to display the answer.
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Question
Answer
What are two sources of secondary radiation?   Leakage and scatter  
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What is the approximate entrance skin exposure for the average anteroposterior supine abdomen?   300 mrad  
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What x-ray interaction is responsible for the majority of scattered radiation reaching the IR?   Compton scatter  
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The minimum lead requirement for lead aprons is what according to the NCRP?   0.5 mm Pb  
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X-ray interaction with matter and the transference of part of the photon's energy to matter is called what?   Scattering  
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What type of radiation is responsible for the annual dose limit for occupationally exposed individuals?   Beta, x-, and gamma radiations  
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What type of photon is filtration most on?   Low-energy scattered photons  
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What is used to describe the quality of an x-ray beam?   HVL-half-value layer  
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Isotopes are atoms that have what?   Same atomic number but different mass  
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What is the purpose of the filter in a film badge?   Measure radiation quality  
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As LET increases, what happens with RBE?   Increase LET, increase RBE  
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Does the photoelectric effect involve interaction with an inner-shell electron or outer-shell electron?   Inner-shell  
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What occurs during the production of characteristic radiation at the tungsten target?   The incident electron ejects an inner-shell tungsten electron.  
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What effect is most responsible for patient dose?   Photoelectric effect  
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What is the single most scattering object in radiography and fluoroscopy?   The patient  
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What does effective dose refer to?   Whole-body dose  
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What is the primary function of filtration?   To reduce patient skin dose.  
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What does the target theory apply to?   DNA molecules  
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What is the pregnant radiographer's dose-equivalent limit for the first month?   0.5 mSv  
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What unit is the radiation output from a diagnostic x-ray tube measured in?   Roentgen  
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Tabletop exposure rate should not exceed what limit during fluoroscopy?   10 R/hr  
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What program ensures the proper functioning of x-ray equipment and protects both the employees and the patients?   Quality assurance  
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What amount of radiation exposure is required to cause temporary infertility to the reproductive organs?   200 rad  
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What amount of radiation exposure is required to cause sterility to the reproductive organs?   500 rad  
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