Radiation Health and Safety - Test 1 2024 Questions and Answers Graded A+

What is a true statement regarding pregnant patients and exposure to radiation? - Lead aprons prevent exposure to the fetus Divergence of the x-ray beam is reduced using: - The paralleling technique The maximum permissible dose (MPD) for occupationally exposed workers is: - 0.05 Sv/yr What represents the optimum desired occupational dose? - 0 rem/yr What would be an acceptable practice for an operator of dental x-ray equipment? - Wearing a film badge only at work What does a film badge monitor? - Radiographer's daily occupational radiation exposures What is an acceptable emission from the tubehead? - Primary radiation What is an accurate statement about safe operating procedures? - All dental staff members should wear dosimeters You have a new dental x-ray machine. The length of the PID is changing form 16 to 8 inches. How does this affect the intensity of the x-ray beam? What adjustment will you need to make to keep the dentistry of your images consistent? - The resultant beam will be four times as intense. You will need to decrease the exposure. Which type of beam does not produce scatter radiation? - Both rectangular and round When using a stepwedge to test developer strength, a total of _________ films should be taken. - 20 A reference radiograph is used to compare: - Densities A coin test is used to check for: - Proper safelighting Extraoral intensifying screens should be checked periodically for: - Dirt and scratches When densities differ by more than two steps on a stepwedge, which protocol should be followed? - Replace the processing solutions On average, processing solution should be changed: - Every 3-4 weeks Which is required fro film duplication? - Duplication film This radiograph is mounted labially. What is the radiopaque restoration on tooth #19 in this image? - An amalgam restoration with an overhang on the mesial surface What process is occurring in this image? - Physiologic resorption Which structure appears in this panoramic image? - Metal framework for two partial dentures What landmark is indicated by the arrow? - Coronoid process Which exposure error results in the "herringbone effect"? - Film reversal How does the median palatine suture appear in a dental image? - Thin radiolucent vertical line between teeth #8 and #9 Which regression alteration of tooth structure appears radiolucent and occurs within the crown or roots of a tooth? - Internal resorption Which structure would not be seen as a maxillary landmark on a panoramic image? - External auditory meatus Why would a developed film be clear? - Failure to turn on the x-ray machine How does static electricity appear on a developed film? - Black branching lines If the radiographic processing time is too short, how will the film appear? - Light Which type of materials can irritate the skin, eyes or lungs and can cause illness or death? - Toxic